ArcelorMittal USA

Guidelines for fabricating and processing

plate steel

Quenching and tempering Forming

Thermal cutting Welding

Important
The information provided herein is based on testing or ArcelorMittal USAs experience and
is accurate and realistic to the best of our knowledge at the time of publication. However,
characteristics described or implied may not apply in all situations. ArcelorMittal USA
reserves the right to make changes in practices that may render some information
outdated or obsolete. In cases where specific plate properties are desired, ArcelorMittal
USA should be consulted for current information and/or capabilities.

Cover Photos: ArcelorMittal USA would like to thank Sun Steel Treating, Inc.
and Logan Corporation for photographs from their facilities.

ArcelorMittal USA
Plate production facilities
Burns Harbor, IN
Coatesville, PA
Conshohocken, PA

P +1 800 966 5352

Table of contents
Table of contents.............................................................................................................................................. i

Preface.................................................................................................................................................................. ii

Characteristics of plate steel........................................................................................................ 1

Chapter 1 Plate chemistry..................................................................................................................... 2

Chapter 2 Melting and casting............................................................................................................. 5

Chapter 3 Heat treatment..................................................................................................................... 6

Chapter 4 Thermo-mechanical-controlled-processing............................................................... 7

Chapter 5 Mechanical properties........................................................................................................ 10

Chapter 6 Corrosion and weathering performance...................................................................... 15

Processing of plate steel................................................................................................................... 19

Chapter 7 Quenching and tempering................................................................................................ 20

Chapter 8 Forming................................................................................................................................... 26

Chapter 9 Thermal cutting.................................................................................................................... 31

Chapter 10 Welding.................................................................................................................................... 38

Welding and other data...................................................................................................................... 45

Chapter 11 Structural plate steel........................................................................................................... 46

Chapter 12 Pressure vessel plate steel................................................................................................ 64

Reference information. ....................................................................................................................... 83

Chapter 13 Physical properties of plate steel................................................................................... 84

Glossary. ......................................................................................................................................................... 85

Page i
 Preface

Guidelines for fabricating

and processing plate steel

Plate steel is defined as a flat, as-rolled or heat treated product sold in cut lengths
in thicknesses of at least three-sixteenths inch and widths of at least 48 inches. Plate steel
is widely used in a variety of end-user markets. For plate to be utilized, it must be further
processed after shipment from the steel mill. This processing may be performed by service
centers, plate processors, fabricators or original equipment manufacturers (OEM). Four
processes account for the majority of this additional processing: quenching and tempering,
forming, thermal cutting and welding. The following book provides guidelines on these
processes. Also, to provide an introduction to plate steel terminology, a brief review is
presented on the characteristics of plate steel.

Guidelines for fabricating and processing plate steel

Page ii
Characteristics of plate steel

Page 1
 Chapter 1 Plate chemistry
Plate chemistry
Steel is essentially a combination of iron and carbon. The carbon content normally ranges
between several hundredths and one percent. Many other elements are added in small
amounts to vary the mechanical characteristics of the steel.

Plate steel generally falls in the category of either a carbon steel, a high strength
low alloy (HSLA) or an alloy steel:

Carbon steels comprise those grades where no minimum content is specified or

required for aluminum, boron, chromium, cobalt, columbium (niobium), molybdenum,
nickel, titanium, tungsten, vanadium or zirconium, or any other element added to obtain
a desired alloying effect; when the specified minimum copper does not exceed 0.40
percent; when the maximum content specified for any of the following elements does
not exceed the percentages noted: manganese 1.65, silicon 0.60, copper 0.60.

HSLA steels are carbon steels with small additions, typically less than 0.1 percent of
microalloying elements, vanadium, columbium or titanium. They may also contain small
additions of copper, nickel and chromium for improved atmospheric corrosion resistance.

Alloy steels comprise those grades which exceed the above limits, plus any grade
to which any element other than those mentioned above is added for the purpose
of achieving a specific alloying effect. Carbon and HSLA steels usually have a lower
base price than alloy steels and, therefore, are much more widely applied.

For structural applications, plates normally do not exceed 0.30 percent carbon and 1.50
percent manganese. Plates can be ordered to chemistry limits, but are more frequently
ordered to ASTM International specifications, which also include mechanical properties.
Besides the standard ASTM industry-wide specifications, there are additional code-writing
bodies such as API, ASME, ABS, AASHTO, SAE, U.S. Military and others with their own
specifications. Individual consuming company specifications are also accepted.
ArcelorMittal USA also offers its own proprietary grades for a number of applications.

Effects of elements
The effects of the commonly specified chemical elements on the properties of hot-rolled
and heat-treated carbon, HSLA and alloy plates are discussed here by considering the
various elements individually. In practice, however, the effect of any particular element
will often depend on the quantities of other elements present in the steel. For example,
the total effect of a combination of alloying elements on the hardenability of a steel is
usually greater than the sum of their individual contributions. This type of interrelation
should be taken into account whenever a change in a specific analysis is evaluated.

Carbon is the principal hardening element in steel, with each additional increment of
carbon increasing the hardness and tensile strength of steel in the as-rolled, normalized or
quenched and tempered condition. For structural applications, the carbon level is generally
less than 0.30 percent. For improved ductility, weldability and toughness, carbon contents
below 0.20 percent are preferred. A compromise must be maintained between higher
carbon levels required for tensile properties and lower carbon levels associated with
improved ductility, weldability and toughness.

Manganese is present in all commercial steels, and contributes significantly to a

steels strength and hardness in much the same manner but to a lesser extent than
does carbon. Its effectiveness depends largely upon, and is directly proportional to,
the carbon content of the steel. Another important characteristic of this element is its
ability to decrease the critical cooling rate during hardening, thereby increasing the steels
hardenability. Its effect in this respect is greater than that of any of the other commonly
used alloying elements.

Guidelines for fabricating and processing plate steel

Page 2
Plate chemistry
Manganese is an active deoxidizer and shows less tendency to segregate than most other
elements. Its presence in a steel is also highly beneficial to surface quality in that it tends to
combine with sulfur, thereby minimizing the formation of iron sulfide, the causative factor of
hot-shortness, or susceptibility to cracking and tearing at rolling temperatures.

Phosphorus is generally considered an impurity except where its beneficial effect

on machinability and resistance to atmospheric corrosion is desired. While phosphorus
increases strength and hardness to about the same degree as carbon, it also tends
to decrease ductility and toughness or impact strength, particularly for steel in the
quenched-and-tempered condition. The phosphorus content of most steels is,
therefore, kept below specified maxima, which range up to 0.04 percent.

In the free-machining steels, however, specified phosphorus content may run as

high as 0.12 percent. This is attained by adding phosphorus to the ladle, commonly
termed rephosphorizing.

Sulfur is generally considered an undesirable element except where machinability is

an important consideration and resulfurized, free machining steels may be ordered.
Examples are Clean-Cut and C1119. Whereas sulfides in steel act as effective chip-
breakers to improve machinability, they also serve to decrease transverse ductility and
toughness. Moreover, increasing sulfur impairs weldability and can have an adverse effect
on surface quality.

ArcelorMittal USA produces Integra and Fineline quality plates with maximum sulfur
levels as low as 0.001 percent with calcium treatment for inclusion shape control. By
controlling sulfur levels, significant improvements in mechanical properties are possible.
Impact and fatigue properties improve. Ductility increases, especially in the through-
thickness direction. Weldability and formability also improve.

Fineline and Integra steels, low sulfur with inclusion shape control
Introduced % Sulfur max.

Conventional 0.035
Electric furnace quality 0.025
Integra
1980 0.006
Fineline
1977 0.010
Fineline Double-O-Five 1985 0.005
Fineline Double-O-Two 1990 0.002*
1991 0.001**
All Fineline steels are vacuum degassed.
* Available in popular grades.
** Available in selected grades only.

Silicon is one of the principal deoxidizers used in the manufacture of carbon and alloy
steels and, depending on the type of steel, can be present in varying amounts up to 0.40
percent. Silicon is also a ferrite strengthener and is sometimes added as an alloying
element up to approximately 0.5 percent in plate steel.

Nickel is one of the fundamental steel alloying elements. When present in appreciable
amounts, it provides improved toughness, particularly at low temperatures. Nickel lowers
the critical temperatures of steel, widens the temperature range for effective quenching
and tempering, and retards the decomposition of austenite. In addition, nickel does not
form carbides or other compounds which might be difficult to dissolve during heating
for austenitizing. All these factors contribute to easier and more successful thermal
treatment. Because of the tight adherent scale formed on reheating nickel containing
steels, the surface quality of plates with nickel is somewhat poorer than those without
nickel. Nickel is also added to copper containing steels to prevent copper induced hot-
shortness.

Page 3
 Plate chemistry
Chromium is used in alloy steels primarily to increase hardenability, provide
improved abrasion resistance and promote carburization. Of the common alloying
elements, chromium is surpassed only by manganese and molybdenum in its effect
on hardenability. Chromium forms a carbide that gives high-carbon chromium steels
exceptional wear-resistance. And because its carbide is relatively stable at elevated
temperatures, chromium is frequently added to steels used for high-temperature
applications. Chromium is also a very important alloy addition to stainless steels,
such as ArcelorMittal USAs Duracorr.

Molybdenum exhibits a greater effect on hardenability per unit added than any
other commonly specified alloying element except manganese or boron. It is a
nonoxidizing element, making it highly useful in the melting of steels where close
hardenability control is desired. Molybdenum is unique in the degree to which it
increases the high-temperature tensile and creep strengths of steel and thus it is
used together with chromium in A387 alloy steels for high-temperature pressure
vessels. Its use also reduces a steels susceptibility to temper embrittlement.

Vanadium is widely used as a strengthening agent in HSLA steels. Vanadium

additions are normally 0.10 percent or lower. Vanadium bearing steels are strengthened
by both precipitation hardening and refining the ferrite grain size. Precipitation of
vanadium carbide and nitride particles in ferrite can provide a marked increase in strength.
Thermo-mechanical-controlled-processing (for example, control rolling) increases the
effectiveness of vanadium. Vanadium is also effective in increasing the hardenability
and resistance to loss of strength on tempering in the quenched and tempered steels.
ArcelorMittal USAs T-1 grades rely on vanadium additions.

Columbium (Niobium) is most often used in steels that receive controlled

thermomechanical treatment. Small additions of columbium in the range from
0.02 percent to 0.04 percent provide a significant improvement in yield strength.
For a given addition, columbium is approximately two times as effective as vanadium
as a strengthener. When the steel is finished below about 1700F, columbium improves
notch toughness primarily by refining grain size. At higher finishing temperatures, it
may be detrimental to toughness. ArcelorMittal USAs BethStar grades rely on both
columbium and vanadium additions for strength and toughness.

Copper is added to steel primarily to improve the steels resistance to atmospheric

corrosion, such as ArcelorMittal USAs weathering steels. In the usual amount between
0.20 percent to 0.50 percent, the copper does not significantly affect the mechanical
properties. In levels to 1.00 percent, copper (in combination with nickel) can increase
strength by precipitation aging as in ArcelorMittal USAs Spartan and A710 steels.
Copper contributes to hot-shortness (unless nickel is also added) and a more adherent
mill scale which adversely affects surface quality.

Boron has the unique ability to increase the hardenability of steel when added in amounts
as small as 0.0005 percent. This effect on hardenability is most pronounced at the lower
carbon levels, diminishing with increasing carbon content. Because boron is ineffective
when it is allowed to combine with oxygen or nitrogen, its use is limited to aluminum-killed
and titanium treated steels. Unlike many other elements, boron does not increase the
ferrite strength of steel. Boron additions, therefore, promote improved machinability and
formability at a particular level of hardenability. It will also intensify the hardenability
effects of other alloys and, in some instances, decrease costs by making possible the
reduction of total alloy content. Examples of boron containing steels are ArcelorMittal
USAs A514 and T-1 grades.

Aluminum is used principally to control grain size and achieve deoxidation. The
fine-grained steels produced by aluminum killing show improved notch toughness
over coarse-grained steels.

Guidelines for fabricating and processing plate steel

Page 4
Melting and casting Chapter 2

Melting and casting

Entrapped gases are deleterious to mechanical properties of steel. Several techniques
exist to remove oxygen from the molten steel. ArcelorMittal USA reserves the right to
select the most suitable method to meet the requirements of individual specifications.

In most steelmaking processes, a primary reaction involves the combination of carbon and
oxygen to form carbon monoxide. Proper control of the amount of gas evolved during
solidification determines the type of steel. If no gas is evolved, the steel is termed killed.
Increasing degrees of gas evolution characterize semi-killed capped or rimmed steel. All
ArcelorMittal USA product is produced from killed steel, unless otherwise specified.

Killed steels are strongly deoxidized and are characterized by a relatively high degree of
uniformity in composition and properties. Most strand-cast plate steel is killed. In ingot
steels, metal shrinks during solidification, and a cavity or pipe forms in the uppermost
portion. A refractory hot-top is placed on the mold before pouring and filled with metal
after the ingot is poured. The pipe formed will be confined to the hot-top section of the
ingot, which is removed by cropping during subsequent rolling. The most severely
segregated areas of the ingot will also be eliminated by this cropping.

While killed steels are more uniform in composition and properties than any other type,
they are nevertheless susceptible to some degree of chemical segregation. As in the other
grades, the top center portion of the ingot will exhibit the greatest degree of positive
chemical segregation.

The uniformity of killed steel renders it most suitable for applications involving such
operations as hot forging, cold extrusion, carburizing and thermal treatment.

Continuous casting
In traditional steelmaking, molten steel is poured into molds to form ingots. The ingots are
removed from the molds, reheated and rolled into semifinished productsblooms, billets
or slabs.

Continuous casting (also referred to as strand casting and slab casting) bypasses the
operations between molten steel and the semifinished product. Molten steel is poured at a
regulated rate via a tundish into the top of an oscillating water-cooled mold with a cross-
sectional size corresponding to that of the desired slab. As the molten metal begins to
freeze along the mold walls, it forms a shell that permits the gradual withdrawal of the
strand product from the bottom of the mold into a water-spray chamber where
solidification is completed. With the straight-type mold, the descending solidified
product may be cut into suitable lengths while still vertical or bent into the horizontal
position by a series of rolls and then cut to length. With the curved-type mold, the
solidified strand is roller-straightened after emerging from the cooling chamber and then
cut to length. In both cases, the cut lengths are then reheated and rolled into finished
products as in the conventional manner.

Figure 2-1: Continuous slab caster

Page 5
Chapter 3 Heat treatment
Heat treatment of plate steel
The versatility of steel is attributable in large measure to its response to a variety
of thermal treatments. While a major percentage of steel is used in the as-rolled
condition, thermal treatments greatly broaden the spectrum of properties attainable.
Heat treatments fall into two general categories: (1) those which decrease hardness and
promote uniformity by slow cooling and (2) those which increase strength, hardness and
toughness by virtue of rapid cooling from above the transformation range. Annealing,
normalizing and stress relieving fall in category 1, while quenching and tempering is
a typical category 2 treatment. ArcelorMittal USA is equipped to normalize, anneal,
stress-relieve, quench and temper, and normalize and temper plates.

Annealing indicates a single thermal treatment intended to place the steel in a suitable
condition for subsequent fabrication. Annealing may be required where machining or
severe forming is involved. The steel is heated to a temperature either slightly below or
above the transformation temperature followed by slow cooling. The exact temperature
and cooling rate or cycle depend on the properties desired by the purchaser.

Normalizing consists of heating the steel above its critical temperature range (typically
1650F to 1700F for plate steel) and cooling in air. This heat treatment is commonly
specified to obtain uniform grain refinement and results in improved notch toughness
compared to as-rolled steels. Normalizing is commonly specified for plates of pressure
vessel quality.

Stress relieving consists of heating the steel to a suitable temperature after flattening
or other cold working, shearing or gas cutting to relieve stresses induced by these
operations. Stress relieving is primarily a function of temperature, with time at
temperature a secondary factor. A typical stress relieving treatment for plate steel
involves heating in the range of 1000F to 1200F followed by slow cooling. For
quenched and tempered steels, the stress relief temperature should be maintained
below the original tempering temperature of the plate.

Quenching and tempering is used to improve the strength and toughness of plate steel.
The treatment consists of heating the steel to the proper austenitizing temperature (for
example, 1650F could be used for a 0.20 percent carbon steel), holding it at
temperature to allow complete transformation to austenite, then quenching in water.
ArcelorMittal USA uses various water-quenching processes, including roller quenching,
platten quenching and a large water tank for quenching thick plate. After quenching, the
steel is tempered at an appropriate temperature, normally in the range of 400F to
1300F. The purpose of tempering is to relieve internal stresses and improve ductility
and toughness.

Guidelines for fabricating and processing plate steel

Page 6
Thermo-mechanical-controlled processing Chapter 4

Thermo-mechanical-controlled-processing (TMCP)
As an alternative or substitute for heat treatments that require additional material handling
and furnace facilities, improved properties can also be obtained through special processing
techniques at the rolling mill.

Controlled-rolling
Controlled-rolling is widely practiced to increase strength and improve notch toughness of
plate steel. A plate rolling practice, controlled-rolling tailors the time-temperature
deformation process by controlling the rolling parameters. The parameters of primary
importance are (1) the temperature for start of controlled-rolling in the finishing stand,
(2) the percentage reduction from start of controlled-rolling to the final plate thickness,
and (3) the plate finishing temperature.

As seen in Figure 2-3, controlled-rolling involves deformation at much lower finish rolling
temperatures than hot rolling, usually in the range from 1300F to 1500F. In contrast, a
normal hot-rolling practice takes advantage of the better hot workability of the material
at higher temperatures. Hot-rolled plates are finished as quickly as possible, frequently at
temperatures of 1800F and above. For controlled-rolling, a hold or delay is generally
taken to allow time for the partially rolled slab to reach the desired intermediate
temperature before start of final rolling.

Controlled-rolling practices are designed specifically for use with microalloyed grades,
which take advantage of the alloying elements influence on recrystallization and grain
growth, in combination with the specific reduction schedule. Because of practical
considerations, primarily mill load and delay times, control-rolled plates are not normally
produced above about 1 in. thickness.

Controlled-finishing temperature rolling

The term controlled-finishing temperature rolling is used to differentiate from the
term controlled-rolling. Controlled-finishing temperature rolling is a much less severe
practice than controlled-rolling and is aimed primarily at improving notch toughness for
plate up to 2.5 inches thick. The finishing temperatures in this practice (approximately
1600F) are higher than required for controlled-rolling. However, because heavier
plates are involved, mill delays to reach the desired temperature are still encountered.
By controlling the finishing temperature, fine-grain size can be obtained with resulting
excellent notch toughness.

Accelerated cooling
Accelerated cooling is a controlled-cooling cycle (water cooling to a temperature of about
1000F to 1100F, followed by air cooling) immediately after the final rolling operation.
(Schematically, this is shown in Figure 2-4.) Accelerated cooling after either controlled-
rolling or controlled-finishing temperature rolling leads to additional structural refinement
and, hence, an improved combination of properties.

Accelerated cooling can improve properties of plates in the approximate thickness

range of 0.5 through 4 inches. A specification covering thermomechanically processed
plates, including the accelerated cooling process, is ASTM A841. The 160-inch plate mill
(Figure 2-2) at ArcelorMittal Burns Harbor in Indiana is capable of TMCP of a variety of
plate steel grades.

Page 7
 Thermo-mechanical-controlled processing
Figure 2-2: ArcelorMittal Burns Harbor 160-inch plate mill

Continuous Accelerated
furnace Pre-leveler cooling unit
2-High 4-High
roughing finishing stand
stand

In and out Descale Interstand cooling Isotope thickness 3500-Ton primary

furnace box system gauge leveler

Figure 2-3: S
 chematic of temperature versus deformation plot showing differences
between conventional hot rolling and controlled-rolling

Figure 2-4: A schematic of accelerated cooling

Guidelines for fabricating and processing plate steel

Page 8
Thermo-mechanical-controlled processing
Steckel mill rolling
The Steckel mill at ArcelorMittal Conshohocken in Pennsylvania is a very cost-effective
rolling mill for producing thin plate (0.17.63 inch) in coiled form. As shown in Figure
2-5, heated coiling furnaces on either side of the 4-high finishing mill contain heated
mandrels, which maintain heat in the product as the plate is passed from one side to the
other and reductions in thickness are made. Because of this processing, the final product
is more uniform than discrete plate production. The plate is accelerated cooled prior to
coiling in a down coiler. These coils are processed on cut-to-length lines where the coiled
plate is leveled and then sheared to width and length.

Figure 2-5: ArcelorMittal Conshohocken Steckel mill

Coiling furnace Coiling furnace

X-ray
thickness
Pinch roll gauges

Finishing mill

Finishing mill capabilities Coiling furnace capabilities

HGC, roll shift and bend 73 In. max. dia., 102 in. wide coil
11,000,000 lbs. force 42.6 ton capacity

Page 9
Chapter 5 Mechanical properties
Mechanical properties
Static properties
Yield and tensile strength are the primary mechanical properties of concern to the
designer. These properties are obtained from standard tensile specimens that can be
either full-plate thickness or 0.505-inch diameter or other sized round specimens. The
tensile specimen also can be used as an indication of material ductility and formability
by measuring elongation and reduction of area. Elongation and reduction of area are
stated as percentages of the original gauge length and cross-sectional area, respectively.
The ASTM specifications typically list requirements for yield strength, tensile strength
and elongation for either 2-in. or 8-in. gauge lengths.

Flat tensile specimens are generally used for all plate grades up to approximately 0.75
inch thickness. For plate grades over 0.75 inch, either flat or 0.505-inch diameter
round specimen type is at the producers option.

Elevated temperature properties

Figure 2-6 shows a band of short-time tensile properties for typical structural steels such
as A36. For temperatures up to 700F, there is no appreciable loss in yield or tensile
strength. At temperatures above 700F, the steel shows a drop in strength. The short-
time tensile results are not applicable for long-time service conditions of 700F and
higher, as creep becomes a factor and reduced stress levels must be considered. Design
information is obtained from creep and creep rupture tests. Section VIII of the ASME
Code for Pressure Vessels Division 1 provides allowable design stresses for steels over
the temperature range from 650F to 1200F.

Toughness
Fracture toughness is a measure of a steels capacity to carry load in the presence of a
crack or crack-like notch. Notch toughness is an indication of a steels capacity to absorb
energy when a stress concentrator or notch is present.

Notch toughness
Notch toughness can be an important factor for applications of plate steel involving
joints with restraint and lower temperature service. Structural steels are susceptible
to a lowering of absorbed impact energy with decreasing temperature. This change
in energy is accompanied by a transition from a ductile to a brittle-appearing fracture.
The temperature at which some specified level of energy or fracture appearance occurs
can be used to define a transition temperature. Transition temperature is an important
concept because it defines a change in mode of fracture from one that is affected
predominately by a shear mechanism (ductile fracture) to one that propagates
primarily by cleavage (brittle fracture).

There are a number of methods for specifying material with adequate notch toughness.
The most common approaches are Charpy V-Notch, drop weight, dynamic tear
and drop weight tear testing and fracture mechanics. These are described in the
following discussion.

Charpy V-Notch (CVN) testing is the most widely applied test for determining notch
toughness following ASTM E23. The specimen is notched perpendicular to the plate
surface. The direction (longitudinal or transverse) of the specimen axis is selected
according to the appropriate specifications for plate steel. The specimen is held for
10 minutes at test temperature and then broken in the appropriate Charpy-type
impact machine by a single blow of a freely swinging pendulum.

On breaking the Charpy specimen, three criteria are commonly measured. The loss
of energy in the pendulum swing provides the energy in terms of foot-pounds (ft-lb)
absorbed in breaking the specimen. The fracture appearance of the broken specimen in
terms of ductile and brittle failure can be rated. In addition, the lateral expansion at the
Guidelines for fabricating and processing plate steel

Page 10
Mechanical properties

Figure 2-6: E
 ffect of temperature on the short-time tensile
and yield strengths of A36 plate steel grades

Figure 2-7: Typical Charpy transition curve

base of the fracture opposite the notch can be measured. Any of these criteria can
be plotted versus temperature, as shown in Figure 2-7, to obtain the typical transition
curve. The notch toughness varies with specimen orientation and requirements are
generally negotiated between the customer and the supplier, with a given energy
at a specified temperature being the most common criteria.

The Charpy testing approach suffers from the fact that a small specimen is tested in
conditions that are not the same as the material in an actual structure. Therefore, the test
results are most useful in rating material on a comparison basis. The dynamic tear test
(ASTM E604) is sometimes of use for specialized applications because it uses a thicker
specimen and a sharper notch. Available CVN guarantee levels for popular structural and
pressure vessel steels are given in Chapters 11 and 12.

Drop weight testing is also used to characterize the toughness of plate steel by
determining the nil-ductility temperature. This test is carried out in accordance with ASTM
E208. Rectangular pieces are cut from the test plate and a crack starter bead is deposited
across the specimen. A notch is machined across the weld bead. Specimens are tested as a
function of temperature. A specimen is set on an anvil, welded surface down, and then
struck by a guided, free-falling weight. A crack must initiate from the crack starter for the
test to be valid. If the crack runs to the edge of the specimen, the specimen is considered
a break (failure). The test is strictly a go/no-go result. The NDT (nil-ductility transition)
temperature is defined as the maximum temperature at which a drop weight specimen
breaks in the test.

Page 11
 Mechanical properties
There is no general correlation between the NDT temperature and the Charpy test.
The physical significance of the NDT value to the designer is if a material is selected whose
NDT is lower than the expected service temperature, brittle failure will not occur at a small
crack subjected to yield stress levels under conditions of dynamic loading. Additionally, this
information (NDT) can be used to determine tolerable crack size at lesser stress levels.

Actual application of this approach requires that the designer know the mode of fracture
initiation, size of the structure, environmental conditions, strength level and residual
stresses in structures having complex shapes and loading.

Unfortunately, there is no exact correlation between the drop weight test results and
Charpy testing. The dynamic tear test does correlate better with drop weight results.3
The choice between the Charpy test, dynamic tear test and the drop weight test still
lies with the designer and is most frequently based on existing specifications and
prior experience.

Fracture Mechanics
In recent years, the development of fracture mechanics has offered the design engineer
a new tool for predicting crack growth under cyclic (fatigue) or increasing loading (as in
a fracture test). The fracture mechanics approach was developed from the stress analysis
of cracked bodies and presupposes linear elastic conditions, i.e. plastic deformation
confined to a very small region near the crack tip. The fracture mechanics approach is
based on the stress intensity factor , which combines the effects of stress, crack length
and geometry.2 For the case of an axially loaded plate containing a central through
___
crack, = c where is a finite width correction factor, is the nominal or
___
gross section stress, and c is the half-crack length. The units of are psi in. or
___
ksi in.

Laboratory tests of compact-type (pin-loaded, edge crack specimens) or bend

specimens enable one to determine the critical value of at onset of unstable fracture.
Provided the material is sufficiently thick to ensure a linear elastic load-deflection
response and satisfies a variety of other criteria defined in ASTM Standard E399, the
critical value qualifies as being the lower bound or plane strain fracture toughness IC.

The linear-elastic fracture mechanics approach is most applicable to the toughness

assessment of high-strength, low-toughness materials at ambient temperatures or lower-
strength materials at very low temperatures. For materials that are too tough to obtain
valid estimates of IC in the thicknesses of typical usage, other elastic-plastic fracture
mechanics parameters such as the J-integral and crack tip opening displacement (CTOD)
are possible alternatives for ranking material toughness.2

Whether using linear-elastic or elastic-plastic fracture mechanics approaches, each

helps to define allowable stresses for a given range of operating conditions. The fracture
mechanics approach can be used to calculate the crack growth rate and the critical crack
size for a given load. This information can be used to define the inspection period required
to find cracks before they could lead to failure under the operating loads.

At present, fracture toughness testing is not within the routine capability of the plate
mills. Consequently, Charpy requirements are still the most widely accepted criteria
for notch toughness.

Fatigue
Fatigue is the process by which a part, component or structure degrades or fails
when it experiences cyclic loading. Fatigue can account for as much as 90 percent of all
failures. In general, fatigue involves two stages: (1) the initiation of a crack and (2) its
subsequent growth to failure. Failure ultimately occurs when the crack is large enough

Guidelines for fabricating and processing plate steel

Page 12
Mechanical properties
that the uncracked section or ligament is unable to support the applied load. The
relative importance of each stage of the cracking process depends on numerous factors,
including the presence of stress raisers (welds, holes, changes in section), the strength
of the material, the applied stress range, and the size of the member. In the case of
unnotched specimens, initiation can occupy the largest fraction of life, while propagation
is the dominant stage when notches are present.

Crack initiation occurs when plastic deformation accumulates in a local region.

In absence of a stress raiser, plastic deformation changes flat surface to a notch-peak
topography with many small cracks initiating at the base of the surface notches. As cyclic
loading progresses, these small cracks join to form a larger one, which can grow in
response to the applied cyclic loads. In the presence of a notch (hole, weld toe), this same
sequence occurs at an accelerated rate. The number of loading cycles required for crack
initiation depends on the material, cyclic load range, stress concentration factor
of the notch and other factors.

Crack propagation is similar to crack initiation in that its driving force is the localized
plasticity that occurs at the crack tip in response to the applied loads. As the tensile stress
is increased, the crack grows and ultimately the crack-tip is enlarged or blunted. On
unloading, the crack-tip radius is resharpened for the next loading cycle. The rate
at which a crack grows during one loading cycle is usually expressed in terms of the range
in stress intensity factor, (a function of the load range, crack length and the specimen
geometry) and is typically insensitive to the strength of the material. There are numerous
references dealing with the kinetics of crack propagation, i.e. plots of crack growth rate
versus the range in stress intensity factor. For more details on crack growth, see the
references listed at the end of this chapter.

Variables affecting fatigue

Some of the most important variables affecting fatigue are:

Stress rangelife decreases as stress range increases.

Residual stresseslife decreases for tensile residual stress and
increases for compressive residual stress.
Notches or weldsreduce fatigue life.
Material propertieslong life fatigue strength (106 to 107 cycles)
increases with increasing tensile strength in the absence of a notch.
Corrosive environmenttypically degrades fatigue performance.

In addition, other variables such as stress state, stress ratio, surface condition,
microstructure, inclusions, grain size, heat treatment, and deoxidation practice
can play a role in the fatigue process. However, the influence of these variables
is generally of secondary importance relative to those listed above.

Material Effects in Fatigue, caused by the absence of a sharp notch, are primarily
controlled by the tensile strength, with higher strength materials having proportionally
higher long life (106 to 107 cycle) fatigue resistance. In the presence of a sharp notch,
fatigue life is insensitive to differences in strength level because crack propagation,
the dominant phase of life in this case, is insensitive to differences in strength level.
In practice, manufactured products frequently have notches or details which act like
notches. Thus, it is seldom possible to achieve greater fatigue life through material
selection alone.

Changing materials to increase the fracture toughness increases the crack length at failure
under a given loading condition and increases the margin of safety against overloads
causing failure when cracks are small. However, increasing fracture toughness will not
markedly lengthen fatigue life because the bulk of life is spent in crack growth when the
crack is much smaller than the critical crack size.

Page 13
 Mechanical properties
Suggestions for controlling fatigue and fracture
Fatigue and fracture are best controlled by proper methods of design, fabrication and
inspection. Improved material properties and quality will not compensate for poor
performance in any of the following.

1. Design information may be obtained from the publications and specifications

of the following agencies:

Agency Type of information

SAE Ground vehicles
ABS Ships
ASME Pressure vessels
AASHTO, AWS, AREA, AISC Bridges, buildings
API Offshore platforms

2. Every effort should be made to minimize the severity of notches or, at the least,
to reduce the stress in the vicinity of the notch.
3. In the presence of a sharp notch, such as the toe of a weldment, most of the
fatigue life will be spent in crack propagation. Several ways to improve the fatigue life
of welded joints include:

Grinding off the butt weld reinforcement.

Dressing fillet welds and avoiding undercut.
Locating the weld in a low-stress region.
Avoiding joints with large variation in stiffness.
Avoiding use of intermittent welds.
Redesigning the weld joint to have lower fatigue susceptibility.

4. High-strength bolted friction joints have much greater fatigue resistance

than most welded details.
5. In most instances, cracks initiate at notch-like areas on the surface of parts.
Manufacturing practices to improve the properties of surface material (i.e.,
carburizing, nitriding, shot peening) can serve as a means of improving
fatigue resistance. However, elimination of the presence of notches in areas
of high stress is most important.
6. Measurement or estimation of the loading history, and testing of prototypes,
are necessary for optimizing fatigue design in terms of weight, cost and safety.
7. Variability in properties within and between plates must be considered when
setting design-allowable stresses.
8. Initial and periodic inspections are necessary to the development of a rational
plan for controlling fatigue and fracture.
9. A thorough fatigue design will consider the possible influences of temperature
and environment, as well as other phenomena such as fretting.

References

1. R. W. Hertzberg, Deformation and Fracture Mechanics of Engineering Materials,

John Wiley and Sons, 1976.
2. S. T. Rolfe and J. M. Barsom, Fracture and Fatigue Control in StructuresApplications
of Fracture Mechanics, Prentice Hall, Second Edition, 1987.
3. A. D. Wilson, Comparison of Dynamic Tear and CVN Impact Properties of Plate Steel,
ASME J. of Eng. Mat. and Tech., April 1998.
4. J. F. Knott, Fundamentals of Fracture Mechanics, John Wiley and Sons, 1973.

Guidelines for fabricating and processing plate steel

Page 14
Corrosion and weathering performance Chapter 6

Corrosion and weathering performance

Corrosion and appropriate preventive measures are parameters that must be considered
when deciding on a material for a particular application. Their importance varies
according to the circumstances. While for the selection of plate steel, mechanical
properties and weldability are of primary concern, there is hardly an application
in which corrosion can be totally neglected.

Corrosion is defined as the destruction or deterioration of metal by electrochemical

interaction with its environment.

Rusting (atmospheric attack)by alternate drying and wetting in air.

Underground or underwater corrosionelectrochemical action between
the steel and surrounding environment.
Stress corrosion crackingpremature failure of a steel member under
static load, in an aggressive environment.
Corrosion fatigue premature failure of a steel member under a cyclic
load in an aggressive environment.

The corrosion of plate steel may be retarded by several methods.

Preventing the plate steel from coming into contact with water or high
humidity, thereby preventing rusting.
Coating or plating the surface of the steel to prevent contact between
the steel and its environment.
Coating the steel with a sacrificial metallic coatinggalvanizing with zinc.
Cathodic protection by an impressed voltage or sacrificial anodes.
Alloying the steel with copper and other elements to reduce or halt the loss
of thickness by means of a tight self-healing oxide that protects the steel
plate after a sufficient thickness of oxide has formed.

The type of corrosion of most concern to plate users is atmospheric attack or rusting
of steels. In certain applications, however, underground and underwater corrosion
and other corrosion-related phenomena, such as stress-corrosion cracking and corrosion
fatigue, may also be important. The latter two occur in specific environments and
manifest themselves as premature failure of structural members under static tensile
and cyclic stresses, respectively.

Atmospheric conditions
Atmospheric corrosion occurs when unprotected steel is exposed to air containing
moisture. The attack generally is uniform on plain surfaces, and may be affected by
corners or other appurtenances. The damage can usually be measured in terms of
loss of thickness in thousandths of an inch (mils) per year. However, the rate of attack
varies with location and time and, therefore, it is not possible to describe accurately
with an average value. Other parameters, such as time to exhibit a specified loss of
thickness, are, therefore, employed to compare the atmospheric corrosion resistance
of different steels.

The severity of atmospheric attack is a function of steel composition and the corrosivity
of the atmosphere. The latter increases with the presence of:

Industrial pollutants such as SO2 , H2S, and chlorides.

Nitrogen compounds.
Airborne dusts and solids.
Seawater spray.
Increase in relative humidity above a certain critical level.

Page 15
 Corrosion and weathering performance
The washing effects of rain or heavy condensation may sometimes be beneficial
in reducing corrosion. Other factors that may affect atmospheric corrosion are:

Initial exposure conditions.

The degree to which steel is sheltered from the atmosphere.
Air movements and temperature.
Details, pockets, corners, collection of debris.

Steel composition
In general, the process of manufacture and the slight variations in composition from
heat to heat that usually occur in steels of the same quality are relatively unimportant
factors with respect to atmospheric corrosion. An important exception is the variation
in copper and other alloying element content.

The presence of copper increases the atmospheric corrosion resistance of steels

through its ability to form a dense, adherent rust layer that acts as a self-healing barrier
against further corrosion. As a rule, 0.2 percent copper in steel provides at least twice the
atmospheric corrosion resistance of an otherwise similar steel without copper. Nickel,
chromium, phosphorus, molybdenum and silicon, in the presence of copper, lead to
further improvements in corrosion resistance.1 This information has been used in the
development of weathering steels, which are used in the unpainted condition in
such applications as bridges and buildings.

Weathering Steel
The superior corrosion resistance of weathering steels in marine, rural and industrial
atmospheres has been clearly documented.2 It has been shown that ASTM A588
Grade B weathering steel (Mayari-R50 and Cor-Ten) is:

6 to 19 times more durable than the steel without copper.

2 to 10 times more durable than the steel containing 0.21 percent copper.

These comparisons were made on the basis of a calculated time ratio to exhibit a
0.010 in. loss in thickness. The performance of Mayari-R50 and Cor-Ten meets the
ASTM A588 specification, which describes the atmospheric corrosion resistance of
weathering steel as approximately two times that of carbon structural steel with copper.

New York State Thruway bridge fabricated with A709 Grade HPS 70W weathering steel.
Guidelines for fabricating and processing plate steel

Page 16
Corrosion and weathering performance
Figure 2-8: Atmospheric corrosion of plate steel in typical industrial environment

250
Thickness Loss (Micrometers)

200
Carbon Steel +
0.021% Cu
150 Carbon Steel +
0.21% Cu

100 A588

A242
50

0
0 5 10 15 20
Time of Exposure (Years)

To demonstrate the advantages of weathering steels, four steels are compared in

Figure 2-8, which shows loss of thickness due to atmospheric corrosion on exposure
over a 16-year period.

Testing conducted by ArcelorMittal USA has shown atmospheric corrosion resistance is

increased by alloying with the elements phosphorus, silicon, chromium, carbon, copper,
nickel, tin and molybdenum. On the other hand, sulfur increases the corrosion rate in
atmospheric corrosion.3

Presence of mill scale affects the rate of atmospheric corrosion during the initial
stages of exposure, but it is not an important factor over a prolonged period. Similarly,
ordinary variations in grain size and heat treatment are relatively unimportant in
atmospheric corrosion.

To obtain maximum corrosion performance from weathering steel, several design

considerations require close attention. The composition of fasteners, rivets and weld metal
used in weathering steel structures and plate assemblies should be the same as that of the
base metal. In certain applications, such as highway guide rail, galvanized fasteners have
been used successfully with weathering steel.4 Since a good exposure to the atmosphere is
important in developing a protective rust layer, crevices and sheltered areas should be
avoided as far as possible. Also, areas exposed to direct contact with corrodants such as
chlorides or sea water spray may be unable to develop full protection, and this must be
kept in mind during designing.

ArcelorMittal USA makes numerous grades of weathering steel:

ArcelorMittal USA weathering steel grades

A242 (Mayari-R)
A514/A517 Grades E, F, P, Q
A588 (Mayari-R50 and Cor-Ten)
A709 Grades 50W, HPS 70W, HPS 100W
A710
A871
Mayari-R60
See ArcelorMittal USAs Booklet 3791, Weathering Steel, for greater detail.

Underwater conditions

Under total immersion conditions in natural waters, all ferrous structural plate materials
corrode uniformly at about the same rate. In sea water, the rate is about a 0.005 in.
loss of thickness per year. The rate of corrosion, however, is strongly dependent on such

Page 17
 Corrosion and weathering performance
environmental factors as the degree of aeration, agitation, presence of dissolved salts,
pH, and presence of protective deposits and temperature. Presence of mill scale is highly
injurious and may lead to pitting of steel by a galvanic action. In underwater, as well
as underground corrosion, weathering steels and copper-bearing grades have no
advantages over copper-free steels.

Coating
Painting provides sufficient protection to most structural steel in the atmosphere. More
corrosion-resistant grades show better paint performance than the carbon steels. Good
surface preparation and proper paint application practice are essential to ensure good
protection. Paints and other protective coatings may also give satisfactory performance
in underwater exposure conditions, but in such applications, recourse is usually made
to other techniques such as cathodic protection, in which the metal structure is made
the cathode of a galvanic couple by an impressed voltage or by sacrificial anodes. It
should, however, be emphasized that cathodic protection and other corrosion-control
techniques are matters to be decided by a qualified corrosion engineer. This article is
in no way intended to be a guide to corrosion-prevention measures which are to be
employed in applications of plate steel.

References
1. H. E. Townsend: Effects of Silicon and Nickel on the Atmospheric Corrosion Resistance
of ASTM A588 Weathering Steel, Atmospheric Corrosion, STP 1239. W. W. Kirk and H. H.
Lawson, Eds., American Society of Testing and Materials, pp 85100, Philadelphia, 1995.
2. H. E. Townsend and J. C. Zoccola, STP 767, ASTM pp 4549, Philadelphia, 1982.
3. H. E. Townsend, The Effects of Alloying Elements on the Corrosion Resistance of Steel in
Industrial Environments, Proceedings of the Fourteenth International Corrosion Congress,
Corrosion Institute of South Africa, September 1999.
4. H. E. Townsend, C. D. Gorman and R. J. Fischer, Atmospheric Corrosion of Hot-Dip
Galvanized Bolts for Fastening Weathering Steel Guiderail, Materials Performance,
38(3) pp 6670, 1999.

Guidelines for fabricating and processing plate steel

Page 18
Processing of plate steel

A review by the customer technical service department of ArcelorMittal USA has identified recent experience with
customer problems in the processing of plate steel. This analysis identified four areas that stood out as most often
causing cracking problems in customer plants. These processes and the cracking cause were as follows:

Quenching and tempering

Cracking of parts during quenching,
quench cracking

Forming
Cracking during cold, warm or hot forming

Thermal cutting
Cracking from heat-affected-zone,
stress-cracking

Welding
Hydrogen-assisted cold cracking

The following chapters provide detailed analysis of these problems and supply guidelines to prevent occurrence in
customer shops.

Page 19
Chapter 7 Quenching and tempering
Quenching and tempering (Q&T) of ArcelorMittal USA steel
Dealing with quench cracking problems
The properties of medium carbon steel can be significantly improved by a quenching
and tempering heat treatment. Quenched and tempered steels are the backbone of
many industries using these steels to produce components that are hard and tough.
However, the Q&T process subjects steels to enormous stresses, which can lead to
cracking if good part design, and heat treating and quenching practices are not
followed. This chapter presents guidelines for minimizing quench cracking in
medium carbon and alloy steels, e.g. 4140 and 4340. These guidelines may
also be appropriate for dealing with lower and higher carbon steels.

Appearance of quench cracks

Quench cracking appears in a quenched and tempered part, either between the
quenching and tempering operations or after tempering. Quench cracking is caused
by the interaction of factors related to part design, heat treating and quenching
practices. During the quenching of steel in oil or water, very high stresses are caused
by nonuniform cooling, thermally induced deformation and the actual martensite phase
transformation. Most often all three mechanisms must be considered to prevent quench
cracking. As shown in Figure 3-1a to 3-1c, when the carbon level of steel increases,
the hardness capable of being achieved increases. The martensite formed, while being
harder, is more brittle and susceptible to cracking. The actual cracking takes place
at notches, holes, slots, grooves or the plate centerline and may be in various orientations.
An example is shown in Figure 3-2.

Heat treating of
parts made from
plate steel.

Figure 3-1a: R
 elation of carbon content and percentage
martensite to Rockwell C hardness

70

60
Hardness, HRC

50

40

30

99.9% martensite

20
0 0.25 0.50 0.75 1.00
Carbon, %

Guidelines for fabricating and processing plate steel

Page 20
Quenching and tempering
Figure 3-1b
70

60
Hardness, HRC

50

40

30

90% martensite

20
0 0.25 0.50 0.75 1.00
Carbon, %

From ASM Metals Handbook, Volume 4, 1991

Figure 3-1c
70

60
Hardness, HRC

50

40

30

50% martensite

20
0 0.25 0.50 0.75 1.00
Carbon, %

From ASM Metals Handbook, Volume 4, 1991

Figure 3-2: C
 omplex machined part with extensive
quench cracking noted by arrows

Cracking is artificially highlighted to improve visibility

Page 21
 Quenching and tempering
Metallographically, quench cracking has a distinctive appearance and is most often
intergranular in nature, as shown in Figures 3-3 to 3-5. A light gray temper scale is often
noted within the crack.

If the crack existed before the Q&T operation, a region of decarburization near the crack
would be created, as shown in Figure 3-6. The use of protective atmosphere furnaces
may eliminate decarburization and the formation of temper scale at pre-existing cracks.

Figure 3-3: U
 netched micrograph showing quench crack
with some temper scale within crack

500X

Figure 3-4: U
 netched micrograph showing interaction
of quench crack with inclusions

500X

Figure 3-5: Etched micrograph showing intergranular nature of quench crack

100X

Guidelines for fabricating and processing plate steel

Page 22
Quenching and tempering
Quench cracking can also be associated with banding in the microstructure, as
displayed in Figure 3-7. Banding is a naturally occurring condition in all medium carbon
and alloy steels that results from the ingot or continuous casting process. Experience
has shown the root cause of most instances of quench cracking is not the banded
structure, but rather the heat treating or part design variables to be discussed below.
While a quench crack may appear to propagate along a banded area, it is rare the
crack was initiated by this microstructural feature.

Heat treating parameters

Several operations or parameters in the Q&T process can influence the susceptibility
to quench cracking.

Heating rateIf a part is heated too quickly or a cold part is placed in a very hot
furnace, the thermal shock alone may initiate cracking. Susceptible steels and parts
should therefore be charged in a warm furnace and the temperature should be
gradually increased to the austenitizing temperature.

Austenitizing temperatureHeating of the part to a very high temperature can

add thermal shock, as well as influence microstructural effects. Although most low
carbon alloy steels are austenitized at 1650F, 0.40 percent carbon alloy steels are best
processed at 1525 to 1575F. It is important actual furnace temperatures be checked
with thermocouples on the part to be sure the part is not overheated.

Figure 3-6: E
 tched micrograph showing extensive decarburization
area near crack, indicating this was a stress-crack from
thermal cutting and not a quench crack

100X

Figure 3-7: E
 tched micrograph showing quench crack
associated with typical banded microstructure

100X

Page 23
 Quenching and tempering
Quenching mediaWhereas most 0.20 to 0.30 percent carbon steels may be
successfully quenched in water, higher carbon steels need special liquid quench media,
such as oil. Some additives are available for oil, which develop varying cooling rates
from that of pure oil. Caution should be used, since some of these modified oils may
approach water in cooling efficiency. Furthermore, the cooling rate can be slowed
further by heating the quenching liquid. Hot oil quenches at 150F have been found
to be particularly useful for susceptible steels and parts.

The choice of quench media is a balancing act. The cooling rate must be quick enough
to give the through-hardening needed for the part design, but not so severe as to cause
cracking. Agitation of the quenching liquid is also important to provide uniform cooling.
It is important the part has been thoroughly cooled to approximately 150F and the
metallurgical transformation has been completed.

Time to temperAfter a part has been quenched, it must be tempered very soon
thereafter. The significant residual stresses in an as-quenched part can cause cracking
during the delay before tempering. Tempering acts as a stress relieving operation to
reduce these stresses. Very susceptible steels or parts should be tempered within eight
to 24 hours after quenching. If this is not possible, a snap temper at 400F will
stabilize a part until a final higher tempering temperature treatment can be performed.

Part design
Very complex machined parts can be susceptible to quench cracking particularly in
higher carbon steels. Often a small modification in the design of a part can reduce
the problem.

NotchesVery sharp notches provide stress concentration where cracking can initiate.
Well-radiused, gradual transitions in corners or slots are important (See Figure 3-8).

Figure 3-8: G
 rooves will cause a shaft to warp in heat treating (top). A keyway with sharp
corners often initiates quench cracks (middle). This cracking is avoided by
designing in a radius (bottom).

Groove

Cracked in
Heat Treatment

Cutter Changed to Produce

Radius in Bottom of Keyway

From ASM Handbook, Volume 4, 1991

Guidelines for fabricating and processing plate steel

Page 24
Quenching and tempering
Changes in cross-sectionsEven when significant radii are provided between changes in
cross-section, cracking may still result. A very small section will cool much more rapidly
than a larger one. This may require a complete part redesign or use of a new steel.

HolesWhether threaded or not, holes are areas where non-uniform cooling takes
place during quenching. Cracking may occur in the holes or in regions near them.
To minimize these problems, packing the holes with an insulating material (Kaowool,
mud, steel wool) will lead to more uniform cooling. If this is not acceptable then flush
quenching of holes is advisable.

Orientation during quenchingWhen parts are immersed in the quenching liquid,

they should be inserted in a manner that leads to a uniform cooling along the piece.

General
Other operations can also influence the susceptibility to cracking of quenched
and tempered parts. For example, if chromium or nickel plating is performed after
Q&T, hydrogen may be picked up in the steel which leads to cracking that looks like
quench cracking. To prevent these problems, plated parts should be baked to
remove the hydrogen.
More detailed discussions of the metallurgy and mechanics of quench cracking
problems are presented in the literature. The ASM Handbook, Volume 4, is a
particularly useful reference source.

Page 25
Chapter 8 Forming
Forming of ArcelorMittal USA steel
Cold, warm and hot forming are important processes used in the conversion of plate steel
to useable parts and machinery. One of the critical properties of steel is ductility, which
allows it to be shaped. There are, however, a wide variety of steel grades and forming
processes that may be utilized. Therefore, guidelines for the safe and effective processing
of plate steel are appropriate. The following guidelines were developed with particular
emphasis on those practices that minimize the potential for cracking during the forming
operation.

Cold forming
Cold forming is a term that applies to forming operations performed at ambient shop
temperatures, typically 5090F. Cold forming is also referred to as roll forming, press
brake bending and cold pressing. These processes can be performed on carbon, high-
strength low-alloy, alloy, stainless and clad plate steel. Guidelines for these processes
are presented in three areas.

Steel propertiesThe mechanical properties of the particular steel grade being formed
dictates the loads required for forming and the care that should be taken during the
process. A low yield strength steel such as ASTM A36 (36 ksi minimum yield strength)
will not require as high a load to form as higher strength steels, such as ASTM A514
(100 ksi minimum yield strength) or ArcelorMittal USA Hardwear 400F (nominal 140
ksi yield strength). The bend forming loads can be estimated from formulas, displayed in
Figure 3-9. The higher loads in high strength steels dictate more care should be taken
because of the greater stored energy in a piece during forming. Furthermore, higher
strength level steels tend to demonstrate more spring-back during the process.

Cold bending
of plate steel.

Figure 3-9: Bend load formula for determining press load

P = (0.833 x U x t 2 x L)/W
P = estimated press load, tons
U = ultimate tensile strength, ksi
t = thickness of plate
L = length of plate to bend, inches
W = width of die opening, inches

Guidelines for fabricating and processing plate steel

Page 26
 Forming
Steel ductility, measured as percent elongation in a tensile test, is also an important
property. Higher tensile ductility levels allow more deformation during bending,
particularly in the outer/tensile surface. Most often ductility decreases with increasing
yield strength. Moreover, steel toughness, as measured by the Charpy V-Notch
impact test, is useful in predicting cracking tendency during forming of plate. If a
steel has sufficient toughness it will be more resistant to crack propagation from stress
concentrations on the work-piece. Metallurgical processes such as heat treatment,
low sulfur processing (including inclusion shape control) and fine grain practices can
improve toughness and minimize cracking problems during forming. The benefits of
forming at warmer shop temperatures is a result of the influence of toughness on
formability. This will be discussed on page 29.

Plate characteristicsSpecific characteristics of the actual plate being formed

also influence its formability.

ThicknessThicker plates not only require increased forming loads, but also
are more susceptible to cracking because of higher surface tensile stresses and
typically lower toughness of thicker plates.
OrientationHot rolling of plate steel results in directionality of properties being
created. Non-metallic inclusions in conventional structural steels are elongated in
the primary rolling direction. These become sites for localized deformation and
eventual cracking. Thus there is an optimum forming orientation for severe bending
applications, as shown in Figure 3-10.

Figure 3-10: Orientation of bend with respect to rolling direction

ion ion
irect irect
lin gD lingD
Rol Rol

Bad direction, longitudinal bend

on ion
ir ect
lingD
Rol

Good direction, transverse bend

Page 27
 Forming
Figure 3-11: Approximate depths of heat affected zones in oxygen cut steels

Oxy-fuel cut edge HAZ depth (inches)*

Thickness
(inches) Low carbon steels High carbon steels Alloy steels

Under 0.5 Under 0.03125 0.03125 0.0625 and greater

0.5 0.03125 0.03125 to 0.0625 0.125 and greater
6 0.125 0.125 to 0.25 0.25 and greater

* Depth of hardened coarse grain HAZ is considerably less

Figure 3-12: Example of cracking in HAZ that lead to failure of bend

Edge conditionA major cause of cracking during forming is the condition

of the plate edge in the vicinity of the bend. An oxy-fuel gas-cut or plasma-cut
edge has a hardened, low toughness heat affected zone (HAZ), which may
initiate a crack during forming. The hardened edges should be removed by
localized grinding or heat treatment. Even sheared plates may have a remnant,
cold worked edge that should be removed by grinding. Figure 3-11 shows the
approximate depths of the HAZ in oxygen cut edges. Figure 3-12 shows an
example of an untreated gas-cut edge that cracked in the HAZ and led to
failure of an A515 Grade 70 plate during forming.
Surface conditionThe surfaces of as-rolled and/or heat treated plates may
have pits, scratches or gouges caused by processing or handling. The tensile/
outer surface in the vicinity of the bend should be inspected and gross defects
smoothed out by grinding. Other surface conditions such as die stamps, arc strikes
or areas where lifting lugs may have been attached would have similar concerns.

Forming practicesThe techniques Figure 3-13: I mportant parameters in

bend forming
and equipment used in cold forming
can have a significant influence on
Punch
successful processing.

x
Forming parametersThe T
R
design of the forming operation
includes the radius of the punch and
the geometry of the die, as
demonstrated in Figure 3-13.
Guidelines for forming of popular V-Die
W
structural grades were developed by
an AISI study. These results are
Punch bend forming severity ratioR/T
summarized and published in
Die bend forming severity ratioW/T
ASTM A6 Appendix X4.
Guidelines for fabricating and processing plate steel

Page 28
Forming
Die conditionsIf the surface of the female die is heavily gouged, smooth
metal movement is inhibited. The surfaces of the V-die should be ground
smooth. To further assist metal sliding over the V-die surfaces, lubrication may
be utilized. Forming waxes and greases are available for these applications.
Clad productsIn severe cold forming applications for roll-bonded clad,
a weld bead, tying in the two clad layers, will minimize the potential for
separation of the layers.

Warm forming
Increasing the local or general temperature of the formed part can be helpful in
difficult forming applications, as long as specific guidelines are followed. Warm forming
is most often used to describe forming done at elevated temperatures that does not
significantly change the properties of the base plate.

Reduced loadsForming loads can be reduced if the temperature of the work-piece

is increased to 900F or higher. However, if the temperature used is too high, the
strength and hardness of the base plate will be reduced. Refer to the mill test report
for the heat treatment history of the plate. As a general guideline, do not heat as-rolled
or normalized steels above 1050F, and do not heat quenched and tempered steels
to within 50F of the mill tempering temperature. In the case of ArcelorMittal USAs
quenched and tempered Hardwear steel, which is tempered at 400F, a maximum
forming temperature should be 350F.

Reduced crackingAs was mentioned earlier, steel toughness is an important property

to resist cracking during forming. Because ferritic steels go through a transition in
toughness versus temperature, the effective toughness of a steel can be enhanced
by increasing the temperature. This is shown schematically in Figure 3-14. Typically
increasing the forming temperature to the range of 200300F can significantly
improve the toughness of the steel and minimize certain cracking problems.

Hot forming
When very thick plates must be formed, the required loads may be beyond machine
capability. Hot forming allows a significant reduction in these loads because the
typical temperatures used (16002000F+), result in a major drop in the yield
strengths of all steel products. However, exposure of the plate steel to these higher
temperatures results in a significant change in the properties and microstructure of
the base plate.

Steel chemistryIn very challenging hot-forming applications, the copper level in

the steel is critical. A problem called copper-checking occurs in structural steels when
the copper level is over 0.15 percent (and there is no matching nickel level). Susceptible
applications include head spinning and fluing or swagging of nozzle openings in

Figure 3-14: Schematic CVN curve showing better toughness at higher temperatures.

Page 29
 Forming
Figure 3-15: Nozzle openings showing Cu-checking problem

pressures vessels. Steels used in these applications should be ordered with a copper
restriction of 0.15 percent maximum. An example of this problem is shown in Figure
3-15.

Forming practicesBecause the plate steel is being heated to such a high temperature,
there are several guidelines to observe.

The uniformity of heating is very important. Also, care must be taken to make sure
there is no direct impingement of the burner flame on the steel surface.
Because the steel may be at high temperatures for a period of time, the
atmosphere conditions in the furnace should be monitored (fuel/air ratios).
Excessive localized oxidation of the steel can result in pitting of the steel surface.

Heat treatment of finished partBecause the properties of the base plate change
during the hot forming operation, subsequent heat treatment of the formed part
may be required.

NormalizingIf the hot forming operation was intended to act as a normalizing

heat treatment as well, the steel mill should have been requested to run a capability
lab test on the plate. Use of the same heating temperature is important.
Furthermore, a normalizing heat treatment requires air cooling after heating.
Formed parts should not be stacked and should be positioned to allow uniform
cooling. Sometimes fan cooling may be required to achieve the cooling rate
necessary to achieve mechanical properties.
Quenching and temperingIf a hot formed part must be quenched and
tempered, the mill capability test heat treatment must be followed. A uniform
and effective water quench of the part is required. Water circulation and a large
enough vessel to hold sufficient water are important. The water temperature should
not exceed 100F to ensure an effective quench. The tempering temperature
and time must also be followed to assure achieving mechanical properties.

Guidelines for fabricating and processing plate steel

Page 30
Thermal cutting Chapter 9

Thermal cutting of ArcelorMittal USA steel

Thermal cutting, burning, or oxy-fuel cutting (OFC) of plate steel with an oxygen torch
is a combination of oxidation and melting. Chemically produced intense heat is generated
by the rapid oxidation of iron with a stream of high purity oxygen. This reaction is
exothermic; that is, heat is given off as the combination takes place. The majority of
the information in this chapter deals with OFC. Some guidelines are also provided for
plasma and laser beam cutting.

Burning begins by heating a small portion of the plate surface to red hot (approximately
1600F) with an oxy-fuel gas flame and directing a stream of high purity oxygen against
it. Oxidation, or burning, begins almost instantly. The heat from the reaction is so intense
that a considerable amount of adjacent metal is melted and flows away from the cutting
slot, or kerf, with the oxidized material. This slag typically may contain 30 percent
melted steel and 70 percent iron oxides (FeO, Fe2O3 and Fe3O4).

The conventional cutting torch is equipped with a tip that contains a cutting oxygen
orifice surrounded by a ring of small oxy-fuel gas ports. A number of gases are
commonly used for the oxy-fuel mix including acetylene, MPS, natural gas, propane
and propylene. Flames from the oxy-fuel ports help initiate the cut, descale the plate,
add heat to maintain cutting and shield the oxygen stream. After initiation of the
reaction, the kerf cut through the plate section will continue to advance as long
as the oxygen stream is supplied.

Oxy-fuel cutting
of plate steel.

Cutting process parameters

For burning, one pound of iron requires 4.6 ft3 of oxygen. Oxygen consumption will
vary depending on the quality of cut desired. For average straight line cutting of low
carbon steel, consumption varies with the thickness of the plate and is lowest in the
4- to 5-inch range. The quantity of oxygen available for reaction decreases as it flows
through the cut.

If oxygen flow is sufficient and properly directedand, if cutting speed is not

excessivethe cut face remains vertical and the rate of cutting will be approximately
constant. If the cutting speed is too fast and/or oxygen flow is insufficient, the lower
portion of the cut reacts slowly and drag marks become pronounced. A slower
cutting speed increases the amount of heat retained and results in an improved
quality cutting edge. Various cutting tips are available depending on the plate thickness
to be cut. Equipment manufacturers provide a suggested range of cutting speeds,
as well as gas flow rates that should be used with their products.

During cutting, the heat from the process causes an area near the kerf to heat up to
temperatures that cause metallurgical transformation of the steel. This heat-affected-
zone (HAZ) is shown schematically in Figure 3-16. The depth of the HAZ is influenced

Page 31
 Thermal cutting
Figure 3-16: Schematic of thermal cutting process

KERF

2300F

0F

0F
180

100
2800F
and
Greater

Direction
of Cutting

Heat Affected Zone

Creation of a heat affected zone

Figure 3-17: Approximate depths of heat affected zones in oxygen cut steels

Thickness Oxy-fuel cut edge HAZ depth (inches)*

(inches) Low carbon steels High carbon steels Alloy steels

Under 0.5 Under 0.03125 0.03125 0.0625 and greater

0.5 0.03125 0.03125 to 0.0625 0.125 and greater
6 0.125 0.125 to 0.25 0.25 and greater

* Depth of hardened coarse grain HAZ is considerably less

by the cutting parameters (slower cutting speed results in a larger HAZ, but with lower
hardness) and the grade of steel being cut. Figure 3-17 shows the effect of steel grade
on the approximate depths of these HAZs. The quality of the HAZ (hardness, cracking) is
influenced by cutting parameters and whether preheating and post heating are needed or
were performed.

Preheating and post heating

When thermal cutting plate in certain combinations of thickness and chemical
composition, special preheating and/or post-heating practices may be necessary.
The use of preheating can:

Increase the efficiency of the cutting operation by permitting increased

travel speed and decreased consumption of oxygen and fuel gas.
Decrease the migration of carbon to the cut surface by lowering the
temperature gradient in the steel adjacent to the cut.
Reduce or prevent hardening of the cut surface by reducing the cooling rate.
Reduce distortion.
Reduce thermally-induced stresses, thereby minimizing the formation of
thermal stress-cracks.

It is essential that preheat temperature be fairly uniform throughout the section in

the area to be cut. Also, cutting should be started as soon as possible to take advantage
of the heat in the plate. It is particularly important in thick plates to have the complete
cross-section heated to the appropriate temperature. This is also important when bringing
cold plates onto the fabrication floor when a nominal +50F plate temperature is
required. Figure 3-18 demonstrates a significant length of time can be required for
a cold plate to warm-up to the +50F minimum plate cutting temperature.

Guidelines for fabricating and processing plate steel

Page 32
Thermal cutting
Figure 3-18: Warm-up of plate to +50F before cutting

30 30

25 25

Time to Heat-up, Hours

Time to Heat-up, Hours

20 20

12"
15 12" 15

10 10
6"
5 6" 5

0 0
-20 -10 0 10 20 30 40 50
Temperature of Plate, F

6- and 12-inch thick plates at -20F or +20F

Fabricating shop at +60F

It is recommended all preheating be done in a furnace or on a special preheat table.

If furnace or table capacity is not available, local preheating in the vicinity of the cut will
be of some benefit. Local preheating may be accomplished by passing the cutting torch
flames over the line of the cut until the desired preheat temperature is reached or by
using a hand held torch. All local preheating should be done slowly and moderately
to avoid high temperature gradients and additional thermal stresses.

Using a proper post heat treatment can eliminate most metallurgical changes caused by
the cutting heat. These include tempering of hardened edges and relieving stresses at the
cut edge. Post heat treatment should be performed in a furnace or by the use of special
multiple flame heating torches as soon as possible after cutting.

Metallurgical influences on cut edge quality

The need for special cutting practices, including preheating and post heating, to
prevent the occurrence of hard cut edges or stress-cracking, are dictated by a
number of parameters.

Carbon contentAs carbon level increases the need for processing

precautions increases.

Alloy levelAs more alloy elements are added to a steel, the need increases.

Plate thicknessThicker plates require special care.

Sulfur levelSteels with intentional additions of sulfur (free-machining) require

more care.

Plate toughnessA plate in the as-rolled condition requires more care than after
it is heat treated.

Part designParts with sharp corners or notches need care to prevent cracking.

Typically, a combination of two or more of these conditions dictates the need for
additional care (preheating and post heating) when thermal cutting.

NOTE: When laying out ArcelorMittal USA mill edge plate for cutting, take
measurements from the centerline of the plate to reliably establish
area of good metal.

Page 33
 Thermal cutting
Guidelines for thermal cutting
The charts on pages 36 and 37 summarize ArcelorMittal USAs recommended preheat
and post heat practices for carbon, HSLA and alloy plate steel. These guidelines are based
on a combination of steel carbon content, carbon equivalent, thickness and ArcelorMittal
USAs experience. Even these guidelines cannot ensure complete freedom from problems.
Good shop thermal cutting practices are essential.

Further processing of thermal cut plates

After thermal cutting plates or plate parts, further guidelines for consideration during
subsequent processing are:

If the grade and thickness requires post heat treatment for the part, the remaining
usable plate skeleton may also need attention to prevent cracking in storage.
If the cut edges are going to be part of a cold formed part, the tension corner of
the edge and any notches should be ground prior to forming.
If a saw cutting or machining operation will start at a thermally-cut edge, stress
relief of the edge or starting of the cut with an abrasive saw may be needed to
penetrate the hardened HAZ.

Plasma-arc cutting

Plasma-arc cutting (PAC) is a thermal-cutting process that uses a high temperature,

high voltage constricted arc to melt material and high velocity gas to blow it away. Since
its introduction in the 1950s, PAC has seen significant development, and with new
technologies such as oxygen-PAC and improved equipment design, higher quality cuts
and cutting speeds at lower operating costs have been achieved. As a result, more steel
fabricators are using PAC, especially in the up to 1.5 inch thickness range. In this thickness
range, PAC competes favorably with other thermal-cutting processes such as laser beam
cutting (LBC) and OFC. The gases typically used to cut steel are nitrogen, air, carbon
dioxide and oxygen.

Cut quality is influenced to a great extent by process variables and the PAC
equipment should be operated and maintained strictly according to manufacturers
recommendations. The most common material-related problems found during PAC are:

Distortion.
Dross formation.

Distortioncan be minimized by:

Ensuring the plate is free from residual stresses.

Employing a cutting sequence to distribute thermally
induced strains evenly.
Using a water shield or cutting under water.

Guidelines for fabricating and processing plate steel

Page 34
Thermal cutting
Dross formationcan be minimized by:

Using oxygen plasma rather than nitrogen or air plasma.

Limiting Si content to less that 0.1 percent, if using nitrogen or air plasma.
Minimizing magnetic handling of the plates, to ensure low levels of
residual magnetism in the plate.

Laser beam cutting

Laser beam cutting (LBC) is a thermal-cutting process that removes material by
locally melting (or vaporizing) with the heat from a laser beam, and using a gas jet
to blow the molten or vaporized material away. Plain carbon and low alloy steels are
most commonly cut using oxygen as the cutting gas and the exothermic reaction of
iron with oxygen provides additional energy to enhance the cutting action. In the past,
use of LBC was limited to steels of thickness 0.25 inch and less using laser power levels
of 1.5 kW or less. With recent advances made in laser technology, higher laser power
levels have been achieved and fabricators now cut 1 inch steel in production.

As with plasma-arc cutting, cut quality is significantly influenced by process variables

and the equipment manufacturers recommendations should be strictly followed for
operation and maintenance of the LBC system. Again like PAC, the most common
material-related problems found during LBC are:

Distortion.
Dross formation, poor cut edge quality.

Distortioncan be minimized by:

Ensuring the plate is free from residual stresses.

Employing a cutting sequence to distribute thermally induced strains evenly.

Dross formationis minimized and cut edge quality improved when:

Surface scale is uniform and tightly adherent, and the surface

is free from mechanical indentations (stamping, gouges, deep
scratches), thick paint/thermal chalk markings and heavy rust.
Si content is low (up to 0.04 percent).
Modest levels of Cu and Ni are present in the steel.
There is no gross segregation or large inclusions in the steel.

In most cases, hot-rolled steels are found to cut better in the as-rolled condition
than the shot-blasted condition. However in some cases, heat-treated (quenched
and tempered) steels give more consistent cuts in the shot-blasted condition. When shot
blasting has to be carried out, using a smaller shot size provides more consistent cuts.
Sand blasting is not recommended on plates to be laser cut.

Page 35
 Thermal cutting
Popular ASTM specifications

Type Thickness (inches)

AAlloy
ASTM CCarbon +50F minimum Preheat 300F Preheat 300Fgas cut hot
specifications HHSLA plate temperature1 gas cut hot immediately 2 HT edges 4
A36, A709-36 C 15 and under over 15
A131 C 2 and under
A202 A 2 and under
A203 A 6 and under
A204 A 4 and under over 4
A225 A 6 and under
A242 C 4 and under
A283 C 15 and under over 15
A284 C 12 and under
A285 C 2 and under
A299 C 2 and under over 2

A302 A 2 and under over 24 over 4

A353 A 2 and under
A38711, 12, 21, 22 A 2 and under over 2
A3875, 9, 91 A 2 and under over 2
A455 C and under

A514A, B, F&H (T-1), P A 20.5 and under

A514E&Q (T-1C ) A 3 and under over 3
A515 C 15 and under
A516 C 15 and under
A517A, B, F&H (T-1), P A 20.5 and under
A517E&Q (T-1C ) A 3 and under over 3
A529 C 0.5 and under
A533 A 2 and under over 24 over 4
A537 C 6 and under
A542 A 2 and under over 2
A543 (HY80, HY100) A 4 and under over 4
A553 A 2 and under
A562 A 2 and under
A572, A709-50 H 3 and under over 3
A573 C 10.5 and under
A588, A709-50W, HPS 50W H 3 and under over 3

A612 C 1 and under

A633 H 6 and under
A656 H 3 and under
A662 C 2 and under
A678 H 6 and under
A710 A 8 and under
A724 C 2 and under
A736 A 4 and under
A737 H 6 and under
A738 C 20.5 and under
A808 H 3 and under
A709-HPS 70W H 2 and under over 2
A871 H 138 and under

Guidelines for fabricating and processing plate steel

Page 36
Thermal cutting
Popular ASTM chemistry only grades

Type Thickness (inches)

AAlloy
ASTM CCarbon +50F minimum Preheat 300F Preheat 300F gas cut hot
A830 grades HHSLA plate temperature1 gas cut hot immediately 2 HT edges

10061025 C 15 and under

1030 C 8 and under over 8
1040 C 1 and under over 13
1045 C 1 and under over 13
1060 C all thicknesses3

ASTM A829 Grades

4130 A 1.5 and under 1.5 to 6 over 63

4140 A 1 and under over 13
4142 A 1 and under over 13
4150 A all thicknesses3
E4340 A all thicknesses3
E6150 A all thicknesses3
8615 A 8 and under
8617 A 8 and under
8620 A 8 and under
8625 A 8 and under
8630 A 2 and under over 23

ArcelorMittal USA Proprietary Grades

Clean-Cut 20 C 2 and under over 2

C1119 C 2 and under over 2
Clean-Cut 45 C 1 and under over 14
C1144 C 1 and under over 14
BethStar H 3 and under

Spartan, HSLA 80/100 A 8 and under

MTD 1 A 1 and under over 14
MTD 2 A 1 and under over 14
MTD 3 A all thicknesses 4
MTD 4 A all thicknesses 4
Hardwear 400F A 2 and under over 23
Hardwear 500F A 1 and under over 13
T-1 Abrasion Resistant A 20.5 and under over 20.5
MIL-A-12560 A 20.5 and under over 20.5
MIL-A-46100 A 1 and under over 12

Notes: Recommended practices are based on Tables 10 and 11, Iron and Steel Society
Steel Products ManualPlates, and/or ArcelorMittal USAs experience.

1. When preheating is not required, plates should be at a temperature of at least

50F. (During winter months, plates brought in from outside storage may require
several days to warm up, depending on thickness).
2. Edges must be heat treated (HT) immediately after cutting to soften the edges.
If unable to heat treat edges immediately, material must be kept hot until heat treated.
3. Heat to 1100F/1325F, hold 0.5 hr./in., air cool. An anneal or sub-critical anneal
may be substituted.
4. Heat to 1050F -25F, hold 0.5 hr./in., air cool.

Page 37
Chapter 10 Welding
Welding of ArcelorMittal USA steel
Dealing with hydrogen-assisted cold cracking
Welding is of critical importance in the fabrication of structures from plate steel. Most
popular structural steels are readily weldable with well-established shop practices and
welding materials. However, under a combination of circumstancesincluding the
grade of steel, welding consumables being used, weld joint design or environmental
conditionscracking of weldments may occur. A popular way to identify a potentially
susceptible grade of steel is to calculate a carbon equivalent and refer to a diagram such
as that shown in Figure 3-19. However, this is at best only a first step in dealing with
a welding situation where susceptibility to weld cracking is of concern. There are
numerous reference sources for guidance in the welding of steels, four of which are
noted at the end of this chapter. In this chapter, we focus on dealing with hydrogen-
assisted weld cracking problems that are most frequently encountered in welding of
structures fabricated from plate steel.

Cracking in Weldments
Cracks occur in the weld and base metal of fabricated weldments when localized
stresses exceed the ultimate strength and/or toughness of the material. These cracks
may be in the longitudinal or transverse direction with respect to the weld axis and
generally are divided into two categories:

Welding of
plate steel.

Figure 3-19: I nfluence of carbon level and carbon equivalent on susceptibility

to hydrogen-assisted HAZ cracking of plate steel

Typical Chemistries
.40
Zone II Zone III
Depends on High Under
Conditions All Conditions
.30
Carbon, %

A516-70
.20
A36 A572-50 A514F
A387-22
.10
Zone I*
Safe Under A710
Most Conditions
0
.30 .40 .50 .60 .70 .80 .90
Mn+Si Ni+Cu Cr+Mo+V
CE = C + + +
6 15 5
*High Strength Welding Consumables May Require Additional Care

From Graville
Guidelines for fabricating and processing plate steel

Page 38
Welding
Hot cracks develop at elevated temperatures, i.e. they commonly form during
solidification of the weld metal.

Cold cracks, or delayed cracks, develop after solidification of the fusion zone as the
result of residual stresses. Cold cracks generally form at some temperature below 200F
(93C), sometimes several hours, or even days, after welding. The time delay depends
upon the grade of steel, magnitude of welding stresses and the hydrogen content of the
weld and heat-affected zone (HAZ).

Delayed cracking normally is associated with dissolved hydrogen and can occur in the
weld metal, generally when filler metals with high yield strength levels are used, or in the
heat-affected zone of the base metal due to diffusion of hydrogen from the weld metal
to the base metal during the welding process (Figure 3-20). Examples of typical delayed
cracks, as in Figures 3-21 and 3-22, include:

Toe cracks which are generally cold cracks that initiate approximately normal
to the base metal surface and then propagate from the toe of the weld where the
residual stresses are higher. These cracks are generally the result of thermal
shrinkage strains acting on a weld heat-affected zone that has been embrittled.
Toe cracks sometimes occur when the base metal cannot accommodate the
shrinkage strains that are imposed by welding.

Figure 3-20: Weldment terminology

Weld Metal Weld Metal

HAZ HAZ

Figure 3-21: Weldment terminology and types of cracks

Toe
Crack

Toe Crack

Root Crack Root Crack

Toe and root cracks

Transverse Transverse
Cracks Cracks

Transverse cracks

Page 39
 Welding
Figure 3-22: Weldment terminology and types of cracks

Underbead Cracks

Underbead cracks

Root cracks, which run longitudinally, originate in the HAZ of the root of the weld.
Transverse cracks are nearly perpendicular to the weld axis. They may
be limited entirely to the weld metal or may propagate from the weld metal into
the heat-affected-zone and the base metal. Transverse cracks are normally related
to hydrogen embrittlement.
Underbead cracks are generally cold cracks that form in the heat-affected
zone. They may be short and discontinuous, or may extend to form a continuous
crack. Usually found at irregular intervals under the weld metal, they do not always
extend to the surface.

The occurrence of any of the aforementioned cracking requires hydrogen in solid solution,
a crack susceptible microstructure and high residual stresses.

Hydrogen can be absorbed from the atmosphere in large amounts by carbon and alloy
steels at the elevated temperatures associated with welding. As the steel cools, it retains
less and less hydrogen in solution and rejects the excess hydrogen. When steel is held at
elevated temperatures or slow cooled, hydrogen atoms can escape back into the
atmosphere by the process known as diffusion. However, rapid cooling, associated with
most welding processes, tends to trap the hydrogen, where it acts to embrittle and
weaken the steel structure. A greater potential for cracking exists in a brittle material
(high-strength, high-hardness) subjected to high residual stresses (restrained joints).

The ability of a steel to form the hard metallurgical constituent known as martensite or
other hard phases is, in general, dependent on the carbon equivalent (CE) of the steel and
the cooling rate imposed upon it in cooling from the transformation temperature. The
higher the CE and the faster the cooling rate, the higher the tendency for hard, brittle
phases to form during cooling. Since the metallurgical characteristics of the base metal
can influence heat-affected zone crack susceptibility and these characteristics are
determined, in large part, by the steels chemistry, small changes in chemical composition
of the base and filler metals (hydrogen content) can appreciably increase cracking
tendency. And, since steel is melted to a composition range, there can be a significant
difference in crack susceptibility between plates produced from several heats of the same
steel grade.

In the welding of plate steel, the plate acts as a giant heat sink and actually sucks heat
away from the weld. The thicker the plates and more complex the design of the weld
joint, the bigger the heat sink, the faster the cooling rate, and the greater the tendency to
form martensite. These factors also lead to the formation of higher residual stresses in the
weldment and, when combined with a restrained joint, can significantly increase the
susceptibility for cracking.

Guidelines for fabricating and processing plate steel

Page 40
Welding
Sources of hydrogen in welding
During the welding process, hydrogen can enter the molten weld pool from
a variety of sources. These sources include:

Moisture, oil, grease, rust or scale on the base metal surfaces.

Moisture in the atmosphere (rainy or humid days), which allows infiltration
of moisture into the shielding atmosphere surrounding the arc zone.
Moisture in the electrode coating or core ingredients of flux-core wire.
Hydrogen from cellulose in the flux or electrode coatings.
Moisture in the flux of submerged arc welding.
Drawing lubricant or protective coatings on bare wire or flux-core wire.

Minimizing hydrogen damage

Hydrogen damage (cracking) can be minimized by establishing and enforcing welding
practices and procedures that prevent excess hydrogen from entering the weld puddle
and by taking steps that permit any dissolved hydrogen to diffuse out slowly. Typical
methods to achieve this include:

1. Thorough cleaning of the base metal (weld joint and adjacent area) by grinding
and brushing.
2. Exclusive use of low hydrogen electrodes and/or low hydrogen welding processes.
3. Proper drying and storing of welding electrodes, fluxes and gases and proper
maintenance of equipment such as wire feeders.
4. Welding procedures that lower welding stresses.
5. Employing a combination of welding and thermal treatments that promote
the escape of hydrogen by diffusion. This also can modify the microstructure
to make it more resistant to hydrogen cracking.

Preheating and maintaining minimum interpass temperature.

Slow cooling or maintaining preheat after welding.
Post-weld heat treatment.

Low hydrogen welding practices

ElectrodesAll electrodes having low hydrogen coverings should be purchased in
hermetically sealed containers. Immediately after opening, electrodes should be stored in
a ventilated oven held at 250F (121C) minimum. After containers are opened or
after electrodes are removed from the holding oven, electrode exposure to the
atmosphere should not exceed supplier recommendations. The following maximums are
provided for reference:

Electrodes exposed to the atmosphere for longer time periods should not be used
unless they have been rebaked. Wet electrodes should be discarded.
Electrodes should be rebaked no more than once.

Exposure maximums

Carbon steel Alloy steel

E70XX 4 hrs. E70XX-X 4 hrs.

E70XXR 9 hrs. E80XX-X 2 hrs.
E70XXHZR 9 hrs. E90XX-X 1 hr.
E7018M 9 hrs. E100XX-X 0.5 hr.
E110XX-X 0.5 hr.

Page 41
 Welding
Carbon electrodes should be rebaked at 500800F (260427C) for a
minimum of two hours.
Alloy electrodes should be rebaked at 700800F (371427C) for a minimum
of one hour.
Electrodes of any classification lower than E100XX-X (except E7018M and
E70XXH4R) used for welding high strength plate steel, such as ASTM A514, A517
& A709-100 &100W, should be baked before use at 700800F (371427C)
for a minimum of one hour, regardless of how the electrodes are furnished.

Bare wire and flux core wireRemove oil, grease, drawing compound and dirt from the
bare wire or flux core wire.

FluxNew fluxes are available that allow weld deposits with low hydrogen levels (less
than 5 ml/100 g). These are particularly useful with higher strength alloy electrodes.

Flux for SAW should be dry and free of contamination from dirt, mill scale
or other foreign material.
Flux should be purchased in packages that can be stored for at least six
months, under normal conditions, without affecting its welding characteristics
or weld properties.
Flux from a damaged package should be discarded or dried before use in a
ventilated oven, using supplier recommendations; generally baking at 700800F
(371427C) for a minimum of one hour.
Flux should be placed in dispensing system immediately upon opening
a package.
When using flux from an open package, the top one inch should be discarded.
Flux that becomes wet should be discarded.
Clean, unfused, reclaimed flux should be dried as described above before reuse.

PreheatEven with all the controls described above for minimizing hydrogen in
the consumables, high carbon steels (over 0.30 percent C), alloy steels, high-strength
steels
(100 ksi/690 MPa yield strength and above), thick plates (over 1 inch or 25 mm) or
highly-restrained weldments may require preheat to prevent cracks or fissures due
to hydrogen. The primary purpose of preheat is to retard the cooling rate in the heat-
affected zone and weld metal. In multi-bead welds, subsequent beads may be deposited
on metal that has been preheated by preceding beads, but the first and most important
bead is deposited on cold steel unless a preheating procedure is adopted. Preheating has
the advantages of:

Drying the joint of any retained moisture.

Burning off any organic compounds.
Increasing the diffusion rate of hydrogen.
Slowing the weldment cooling rate.

Calculations have established the cooling rate from a preheated plate temperature of
200F (93C) is only 85 percent the rate from a plate at the ambient temperature of
75F (24C). It is 70 percent for a 300F (149C) preheat. This slower cooling rate
modifies the heat-affected zone microstructure to make it more crack resistant and
lowers the level of residual stresses in the weldment.

Preheating temperatures used are based on experience or codes, such as the AWS D1.1
and D1.5. Typically, shop ambient temperatures of 5060F (1016C) are
appropriate to some thickness. The preheat temperatures should then increase with
thickness, for example, 150F (66C), 225F (107C), 300F (149C). For high
carbon and high alloy steels, preheating temperatures as high as 600F (360C) may
be required. Furthermore, the higher residual stresses that result with certain joint

Guidelines for fabricating and processing plate steel

Page 42
Welding
designs and higher strength welding consumables may require higher preheats to avoid
delayed cracking even for carbon steels that usually require minimal preheat.

Methods for preheatingThe preheat method used is also important. Preheating may be
applied in several fashions, with oxy-fuel (rosebud) torches being one of the most
common. Various types of electric resistance heaters or blankets are also available.

One of the by-products of combustion is moisture. When a flame is applied to cold

steel, condensation usually occurs in the region. It is important to drive this moisture
(chase the chill) from the weld zone. Also, flame preheating from only one side of
the plate may cause condensation on the opposite side of the joint, causing moisture
to be picked up in the first, or root, pass.

Preheat temperature measurement can be accomplished in several ways, the

most common being the use of Tempil sticks (crayons that melt at the prescribed
temperature). It is important to remember the proper preheat temperature has
not been reached and the steel is not ready to weld until the Tempil sticks melt at
a minimum distance of 3 inches on either side of the joint, as well as the back side.

Once welding begins, the weld joint should not be allowed to cool below the preheat
temperature (now the minimum interpass temperature) until the welding is complete.
If the welding operation is interrupted for any reason, the above preheating operation
should be repeated until the minimum preheat temperature is re-established.

Slow cooling and post-weld heat treatment

The same thick, high-strength restrained weldments that require preheat may also
require slow cooling and/or post-weld heat treatment (PWHT). Again, this preheat/
post heat combination serves the purpose of reducing residual stresses, allowing
the diffusion of dissolved hydrogen and modifying the microstructure of the heat
affected-zone to render it more crack resistant.

The most common methods of slow cooling involve maintaining minimum preheat
temperature on the joint for several hours after the welding has been completed
and/or wrapping the completed weldment with an insulating blanket to retard
the cooling rate.

While the preheat and slow cool methods described above help in reducing the
formation of martensite, a certain amount is unavoidable in thick, high CE steels.
In these instances, post-weld heat treatment (PWHT) may be necessary. PWHT, also
known as stress relieving or tempering, is usually accomplished by heating the
weldment to a temperature below its tempering temperature or other temperature
which may affect the base metal properties. However, for PWHT to be of value in
reducing hydrogen in the weldment it must be performed immediately after the
weld has begun to cool. Other critical aspects of any PWHT include:

Temperature of the furnace for charging the weldment.

Heat up rate.
PWHT temperature and range.
Hold time at temperature.
Cooling rate.

Applicable codes and specifications, job requirements and qualification test requirements
generally govern the specific PWHT cycle selected. Some steels, such as ASTM A514 and
A710, can be embrittled by PWHT. It is recommended the choice of PWHT be made only
after review by a welding engineer.

More specific welding information

Chapters 11 and 12 provide more detailed welding information for popular structural and
pressure vessel plate steels.
Page 43
 Welding
References
The following references are excellent resources for additional information
on the welding of steels.

1. R. D. Stout. Weldability of Steels, 4th edition, Welding Research Council,

New York, NY, 1987.
2. ASM International. ASM Handbook, Volume 6, Welding, Brazing and Soldering,
Materials Park, OH, 1993.
3. American Welding Society. D1.196, 1996, Structural Welding CodeSteel,
Miami, FL, 1996.
4. American Welding Society. D1.596, 1996, Bridge Welding Code,
Miami, FL, 1996.

Guidelines for fabricating and processing plate steel

Page 44
Welding and other data

Welding and other data are provided for structural and pressure vessel plate steel grades. This information includes
welding electrode and preheat guidelines, and typical carbon equivalent levels. This welding information may be more
stringent than AWS D1.1. Furthermore, although some grades may be welded with other than low hydrogen
practices, ArcelorMittal USA recommends use of low hydrogen welding practices for all plate steel welding. Also
provided are available Charpy V-Notch levels that can be ordered and, where available, typical stress-strain curves
and atmospheric corrosion data. Please refer to ArcelorMittal USA if additional data is desired.

Structural plate steel

Plate steel grades produced following
ASTM A6 general requirements

Pressure vessel plate steel

Plate steel grades produced following
ASTM A20 general requirements

Page 45
Chapter 11 Structural plate steel

Welding and other data

on structural plate steel grades

Structural grades
Grade Page number Grade Page number

A36 47 A633 55
A242 48 A656 56
A283 49 BethStar
57
A514 50 A678 58
A529 51 A710 59
A572 52 A808 60
A573 53 A871 6162
A588 54 Hardwear 63

Guidelines for fabricating and processing plate steel

Page 46
Structural plate steel A36

Standard specification Description

for carbon structural steel Specification covers plates, shapes and
bars. Only data applicable to plates is
shown. This specification, which describes
Welding data an as-rolled plate steel grade, is approved
Suggested welding consumables for arc welding processes for use by the Department of Defense.
Manual shielded Submerged- Gas Flux Notes
metal-arc arc metal-arc cored-Arc
low hydrogen
Only low hydrogen Year introduced
electrodes shall be used
E70xx, E70xx-x F6xx-Exxx, ER70S-x E6xT-x, when welding A36 more 1960
F7xx-Exxx, E7xT-x except than 1 in. (25.4 mm)
F7xx-Exx-xx -2, -3, -10, -GS thick for dynamically
loaded structures.

Suggested minimum preheat and interpass temperature for arc welding Special features
This specification permits the addition of
Thickness Manual shielded Submerged-arc Notes
(inches) Metal-arc Gas metal-arc copper to enhance corrosion resistance.
Low hydrogen Flux cored-arc A special paragraph relating to the use
* When the base metal of this grade for bridge base plates is
Up to incl None* None*
temperature is under
32F, preheat the base
included in the specification. If the plate
Over to 10.5 incl 70F 70F
metal to at least 70F is used for this purpose, refer to the
Over 10.5 to 20.5 incl 150F 150F and maintain this
temperature during specification for more information.
Over 20.5 225F 225F welding.

Preheat and interpass temperatures to prevent hydrogen-assisted cracking Thickness Typical

depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat
iInches) carbon Normal uses
and interpass temperatures. In general, the listed temperatures are similar equivalent
values A popular workhorse grade, it is
to those published in the AWS Structural Welding Code, D1.1.
used widely for various applications.
Welding carbon equivalent = Up to 10.5 incl 0.33 to 0.37
For bridges, this grade is specified as
Mn Cr + Mo + V Ni + Cu Over 10.5 to
C
+ 6 + 5 + 15
20.5 incl 0.35 to 0.39 A709 Grade 36.
The carbon equivalent range shown in the table is based on heat analysis. Over 20.5 to
It is the range most commonly produced for plates by ArcelorMittal USA. 15 incl 0.38 to 0.42
Individual plates or heats may have carbon equivalents beyond the range
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent. Impact toughness
Impact toughness requirements are not
Shaded area denotes availability of A36 plate with Charpy included in the basic specification, but can
15 ft-lb longitudinal impact toughness at various temperatures be added as a supplementary requirement.
Temp. +70F +40F +10F 0F -20F -30F -50F ArcelorMittal USA can furnish the Charpy
Thickness values shown on this sheet at extra charge.
(inches)
Additional requirements such as deoxidation
Up to 4 incl practice, modified chemistry, special rolling
Over 4 to 8 incl or heat treatment may be necessary to
Over 8 to 12 incl achieve the properties.

Stress vs. strain curvetensile coupon Typical industrial atmospheric corrosion data Special notes
This grade is available with Integra
or Fineline quality to achieve
improved properties.

A representative stress vs. strain curve for

a typical 8 in. gauge tensile coupon.

Page 47
 A242 Structural plate steel
Description Standard specification for
Specification covers a grade of steel high-strength, low-alloy structural steel
for plates, shapes and bars. Only data
applicable to plate is shown. A242 is a
high-strength, low-alloy grade that has Welding data
approximately four times the corrosion Suggested welding consumables for arc welding processes
resistance of carbon steels without copper. Structure Manual shielded Submerged- Gas Flux Notes
ArcelorMittal USAs trade name for type Metal-arc arc metal-arc cored-arc
Low hydrogen
Type 1 is Mayari-Rand Cor-Ten. This
specification is approved for use by the Structure E8016-B1, F7xx-Exxx-W See E80T1-W
Department of Defense. will not E8018-B1, AWS D1.1 *T
 hese rods can be used
be painted E8018-W in unpainted structures
after in single-pass fillet welds
fabrication to 0.25 inch maximum
and in single-pass
Year introduced Structure E7015, E7016, F7xx-Exxx, ER70S-x E7xT-x except groove welds of 0.25
will be E7018, E7028, F7xx-Exxx-xx -2, -3, -10, -GS inch maximum since
1941 painted E7015-x, E7016-x, these welds have high
after E7018-x, E7028-x base metal dilution.
fabrication*

Special features Suggested minimum preheat and interpass temperature for arc welding
This specification allows the customer to
request proof of corrosion resistance from Thickness Manual shielded Submerged-arc
(inches) Metal-arc Gas metal-arc
the plate producer. Low hydrogen Flux cored-arc

Up to incl 70F 70F

Normal uses Over to 10.5 incl 70F 70F

A corrosion-resistant steel whose oxide Over 10.5 to 20.5 incl 150F 150F
forms a protective coating. Used in Over 20.5 to 4 incl 225F 225F
many painted and unpainted applications Preheat and interpass temperatures to prevent hydrogen-assisted cracking Thickness Typical
(buildings, bridges, industrial equipment, depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat
(inches) carbon
railroad rolling stock). and interpass temperatures. In general, the listed temperatures are similar equivalent
to those published in the AWS Structural Welding Code, D1.1. values
Welding Carbon Equivalent =

Up to 4 0.30 to 0.44

Impact toughness C
Mn Cr + Mo + V Ni + Cu
+ 6 + 5 + 15
Impact toughness requirements are not
The carbon equivalent range shown in the table is based on heat analysis.
included in the basic specification, but can It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range
be added as a supplementary requirement. in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
ArcelorMittal USA can furnish the Charpy
values shown on this sheet at extra charge. Shaded area denotes availability of A242 plate with Charpy
Additional requirements such as deoxidation 15 ft-lb longitudinal impact toughness at various temperatures
practice, modified chemistry, special rolling Temp. +70F +40F +10F 0F -20F -30F -50F
or heat treatment may be necessary to Thickness
achieve the properties. (inches)

Up to 4

Special notes
This grade is available with Integra Typical industrial atmospheric corrosion data
or Fineline quality to achieve improved
properties. Post-weld heat treatment may
degrade heat-affected zone strength and
toughness. Pretesting of specific welding
and post-weld heat treating procedures is
recommended to assure optimization of
final property levels.

ASTM color code

Blue

Guidelines for fabricating and processing plate steel

Page 48
Structural plate steel A283

Standard specification for low and Description

intermediate tensile strength carbon steel plates Specification covers four grades of steel
for plates, shapes and bars. Only data
applicable to as-rolled plate steel grades
Welding data is shown.
Suggested welding consumables for arc welding processes
Grade Manual shielded Submerged- Gas Flux
Metal-arc arc metal-arc cored-arc Year introduced
Low hydrogen
1946
A, B, C, D E70xx, F6xx-Exxx, ER70S-x E6xT-x,
E70xx-x F7xx-Exxx, E7xT-x except
F7xx-Exx-xx -2, -3, -10, -GS
Special features
Suggested minimum preheat and interpass temperature for arc welding This specification permits the addition of
copper to enhance corrosion resistance.
Grade Thickness Manual shielded Submerged-arc Notes
(inches) Metal-arc Gas metal-arc
Low hydrogen Flux cored-arc

A, B, Up to incl None* None* * When the base metal Normal uses

temperature is under 32F,
C, D Over to 10.5 incl 70F 70F preheat the base metal to at
An inexpensive utility grade
Over 10.5 to 20.5 incl 150F 150F least 70F and maintain this of steel used widely in many
Over 20.5 225F 225F temperature during welding.
non-demanding applications.
Preheat and interpass temperatures to prevent hydrogen-assisted cracking rade
G Thickness Typical
depend on specific welding conditions and restraint level associated with
(inches) carbon
joint configuration. This table should only be used as a guide for preheat
equivalent
and interpass temperatures. In general, the listed temperatures are similar
to those published in the AWS Structural Welding Code, D1.1. values Impact toughness
Welding carbon equivalent = A Up to 15 0.12 to 0.18 Impact toughness requirements are not

Mn Cr + Mo + V Ni + Cu B Up to 15 0.15 to 0.25 included in the basic specification, but can

C
+ 6 + 5 + 15
be added as a supplementary requirement.
C Up to 15 0.17 to 0.29
The carbon equivalent range shown in the table is based on heat analysis. ArcelorMittal USA can furnish the Charpy
It is the range most commonly produced for plates by ArcelorMittal USA. D Up to 15 0.24 to 0.37
Individual plates or heats may have carbon equivalents beyond the range values shown on this sheet at extra charge.
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent. Additional requirements such as deoxidation
practice, modified chemistry, special rolling
Shaded area denotes availability of A283 plate with Charpy
or heat treatment may be necessary to
15 ft-lb longitudinal impact toughness at various temperatures
achieve the properties.
Temp. +70F +40F +10F 0F -20F -30F -50F
Thickness
(inches)
Special notes
Up to 4
This grade is available with Integra
Over 4 to 18 incl
or Fineline quality to achieve
Over 8 to 12 incl improved properties.

Stress vs. strain curvetensile coupon Typical industrial atmospheric corrosion data ASTM color code
Grade: DOrange

A representative stress vs. strain curve for

a typical 8 in. gauge tensile coupon.

Page 49
 A514 Structural plate steel
Description Standard specification for high yield strength, quenched and
Specification covers a grade of steel for
plates. It is an alloy steel grade, fully killed,
tempered alloy steel plate, suitable for welding
fine grain (ASTM Number 5 or smaller). This specification permits varied chemistries called Grades A, B, C, E, F, H, J, K, M, P, Q, R, S and T.
It is heat treated by quenching and (ArcelorMittal USA makes only ASTM A514 Grades A, B, E, F, H, P and Q.)
tempering. The heat treating temperatures
are reported on the test certificates. The Welding data
specification permits 14 compositions, of Suggested welding consumables for arc welding processes
which ArcelorMittal USA produces Grades
A, B, D, E, F, H, P and Q. The specification is Thickness Manual shielded Submerged- Gas Flux Notes
(inches) Metal-arc arc metal-arc cored-arc
approved for use by the Department of Low hydrogen
Defense. The pressure vessel version of this
specification is A517. Up to E11015-x, E11016-x, F11xx-Exx-xx ER110S-x E11xTx-x See Special notes
20.5 incl E11018-x section for concerns
Year introduced Over 20.5 E10015-x, E10016-x, F10xx-Exx-xx ER100S-x E10xTx-x
about post-weld heat
1964 treatment.
E10018-x

Special features  eposited weld metal shall have a minimum impact strength of 20 ft-lb
D
(27.1J) at 0F (-18C) when Charpy V-Notch specimens are required.
A quenched and tempered alloy grade with
a high strength-to-weight ratio.
Suggested minimum preheat and interpass temperatures for welding
Normal uses Thickness Produced to Produced to minimum brinell hardness
Industrial applications where high strength, (inches) A514 tensile properties requirements for abrasion resistant applications
low weight and high impact values are
required. Machinery, mining equipment Up to incl 50F 100F
and other demanding applications. The Over to 10.5 incl 125F 150F
chemistries of the A514 grades are often
used to produce abrasion resistant grades Over 10.5 to 20.5 incl 175F 200F
to minimum Brinell requirements. Welding Over 20.5 225F 250F
information is also provided for them. For
A preheat or interpass temperature above the minimum shown may be
bridges, this grade is specified as A709 Grade Thickness Typical
required for highly restrained weldspreheat or interpass temperatures
should not exceed 400F for thicknesses up to 1.5 inch or 450F for (inches) carbon
Grade 100 or 100W.
thicknesses over 1.5 inch. equivalent
Impact toughness Welding carbon equivalent =
values

Impact toughness requirements are not A Up to 1.25 0.45 to 0.55

Mn Cr + Mo + V Ni + Cu
included in the basic specification, but can C
+ 6 + 5 + 15
B Up to 1.25 0.40 to 0.53
be added as a supplementary requirement.
The carbon equivalent range shown in the table is based on heat analysis. E Up to 6 0.70 to 0.80
ArcelorMittal USA can furnish the Charpy It is the range most commonly produced for plates by ArcelorMittal USA.
values shown on this sheet at extra charge. Individual plates or heats may have carbon equivalents beyond the F Up to 2.25 0.50 to 0.60
range in the table. See Chapter 10, page 38, regarding the significance
Additional requirements such as deoxidation of carbon equivalent. H Up to 2 0.50 to 0.60
practice, modified chemistry, special rolling
P Up to 4 0.60 to 0.70
or heat treatment may be necessary to
achieve the properties. Q Up to 6 0.75 to 0.85

Special notes Shaded area denotes availability of A514 plate with Charpy
This grade is available with Integra or
Fineline quality to achieve improved 15 ft-lb longitudinal impact toughness at various temperatures
properties.
Temp. +70F +40F +10F 0F -20F -30F -50F
Grades A, E, P Post-weld heat Thickness
treatment may degrade heat-affected (inches)
zone strength and toughness. Pretesting
of specific welding and post-weld heat Up to 6
treating procedures is recommended to
assure optimization of final property levels. Stress vs. strain curvetensile coupon Typical industrial atmospheric corrosion data
Grades B, F, H, Q It is important to
note this grade of steel may be susceptible
to cracking in the heat-affected zone of
welds during post-weld heat treatment
(stress relief). Therefore, ArcelorMittal
USA recommends careful consideration be
given to this phenomenon by competent
welding engineers before stress relieving
is applied to weldments of this grade.
Also, it is not recommended for service
at temperatures lower than -50F or
higher than 800F.

ASTM color code

Red A representative stress vs. strain curve for
a typical 8 in. gauge tensile coupon.
Guidelines for fabricating and processing plate steel

Page 50
Structural plate steel A529

Standard specification for high-strength Description

carbon-manganese steel of structural quality This specification covers a grade of plate
steel, shapes, sheet piling and bars. Only
data applicable for an as-rolled steel
plate grade is shown. This specification
Welding data is approved for use by the Department
Suggested welding consumables for arc welding processes of Defense.
Thickness Manual shielded Submerged- Gas Flux
(inches) Metal-arc arc metal-arc cored-arc
Low hydrogen
Year introduced
Up to 1 E70xx F6xx-Exxx, ER70S-x, E6xT-x, 1964
E70xx-x F7xx-Exxx, E7xT-x except
F7xx-Exx-xx -2, -3, -10, -GS

Suggested minimum preheat and interpass temperature for arc welding Special features
A low-cost grade limited to 0.5 inch
Thickness Manual shielded Submerged-arc Notes thickness, used occasionally for
(inches) Metal-arc Gas metal-arc
Low hydrogen Flux cored-arc non-demanding applications.
* When the base metal temperature
is under 32F, preheat the base
Up to incl None* None* metal to at least 70F and maintain
Over to 1 incl 150F 50F this temperature during welding.
Impact toughness
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Thickness Typical Impact toughness requirements are not
depend on specific welding conditions and restraint level associated with
(inches) carbon included in the basic specification, but can
joint configuration. This table should only be used as a guide for preheat
and interpass temperatures. In general, the listed temperatures are similar equivalent
to those published in the AWS Structural Welding Code, D1.1. values be added as a supplementary requirement.
Up to 1 0.37 to 0.42 ArcelorMittal USA can furnish the Charpy
Welding carbon equivalent =
values shown on this sheet at extra charge.
Mn Cr + Mo + V Ni + Cu
C
+ 6 + 5 + 15 Additional requirements such as deoxidation
The carbon equivalent range shown in the table is based on heat analysis. practice, modified chemistry, special rolling
It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range
or heat treatment may be necessary to
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent. achieve the properties.

Shaded area denotes availability of A529 plate with Charpy

15 ft-lb longitudinal impact toughness at various temperatures
Special notes
Temp. +70F +40F +10F 0F -20F -30F -50F This grade is available with Integra
Thickness
(inches) or Fineline quality to achieve
improved properties.
Up to 1

ASTM color code

Typical industrial atmospheric corrosion data
Grade: 50Black and yellow
55Black and red

Page 51
 A572 Structural plate steel
Description Standard specification for high-strength,
This specification covers four grades of
low-alloy columbium-vanadium structural steel
high-strength, low-alloy structural steel
shapes, plates, sheet piling and bars.
Only data applicable to plate steel is shown Welding data
here. The specification defines Suggested welding consumables for arc welding processes
four microalloy types. ArcelorMittal USA
Grade Manual shielded Submerged- Gas Flux Notes
routinely makes Type 1 and Type 2. Metal-arc arc metal-arc cored-arc
This specification is approved for use Low hydrogen
by the Department of Defense.
42, 50 E7015, E7016, F7xx-Exxx, ER70S-x E7xT-x except D eposited weld metal shall
have a minimum impact
E7018, E7028, F7xx-Exx-xx -2, -3, -10, -GS strength of 20 ft-lb (27.1J)
E7015-x, E7016-x, at 0F (-18C) when
Year introduced E7018-x, E7028-x Charpy V-Notch specimens
are used. This requirement is
1966 60, 65 E8015-x, E8016-x, E8018-x F8xx-Exx-xx ER80S-x E8xTx-x applicable only to bridges.

Suggested minimum preheat and interpass temperature for arc welding

Special features
This grade is available in four strength Grade Thickness Manual shielded Submerged-arc
(inches) Metal-arc Gas metal-arc
levels. The addition of copper is permitted Low hydrogen Flux cored-arc
to enhance corrosion resistance.
42, 50 Up to incl 70F 70F
Over to 10.5 incl 70F 70F
Over 10.5 to 20.5 incl 150F 150F
Normal uses Over 20.5 to 4 incl 225F 225F
A widely used structural grade. It is a 60, 65 Up to incl 70F 70F
natural successor to A36 when the strength Over to 1.25 incl 150F 150F
of a component must be increased. For
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical
bridges, this grade is specified as A709 depend on specific welding conditions and restraint level associated with
(inches) carbon
joint configuration. This table should only be used as a guide for preheat
Grade 50. and interpass temperatures. In general, the listed temperatures are similar equivalent
to those published in the AWS Structural Welding Code, D1.1. values

Welding carbon equivalent = 42 Up to 6 0.32 to 0.41

Impact toughness 50 Up to 10.5 incl 0.32 to 0.41
Mn Cr + Mo + V Ni + Cu
Impact toughness requirements are not C + 6 + 5 + 15
Over 10.5 to 4 incl 0.39 to 0.43
included in the basic specification, but can The carbon equivalent range shown in the table is based on heat analysis. 60 Up to 1.25 0.41 to 0.51
be added as a supplementary requirement. It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range 65 Up to 0.5 incl 0.41 to 0.51
ArcelorMittal USA can furnish the Charpy in the table. See Chapter 10, page 38, regarding the significance of carbon Over 0.5 to 1.25 incl 0.42 to 0.50
values shown on this sheet at extra charge. equivalent.

Additional requirements such as deoxidation

Shaded area denotes availability of A572 grade 50 plate with Charpy
practice, modified chemistry, special rolling
15 ft-lb longitudinal impact toughness at various temperatures
or heat treatment may be necessary to
achieve the properties. Temp. +70F +40F +10F 0F -20F -30F -50F
Thickness
(inches)
Special notes Up to 10.5 incl
This grade is available with Integra
Over 10.5 to 3 incl
or Fineline quality to achieve improved
Over 3 to 4 incl
properties. Post-weld heat treatment may
degrade heat-affected zone strength and
toughness. Pretesting of specific welding Stress vs. strain curvetensile coupon Typical industrial atmospheric corrosion data
and post-weld heat treating procedures is
recommended to assure optimization of
final property levels.

ASTM color code

Grade: 42Green and white
50Green and yellow
60Green and gray
65Green and blue

A representative stress vs. strain curve for

a typical 8 in. gauge tensile coupon.

Guidelines for fabricating and processing plate steel

Page 52
Structural plate steel A573

Standard specification for structural Description

carbon steel plates of improved toughness A specification for three grades of plate
steel described by ASTM as having
improved notch toughness through the
Welding data use of fine grain practice. A573 is made
Suggested welding consumables for arc welding processes to three tensile strength levels.
Grade Manual shielded Submerged- Gas Flux
Metal-arc arc metal-arc Cored-arc
Low hydrogen
Year introduced
58 E70xx F6xx-Exxx, ER70S-x E6xT-x, 1968
F7xx-Exxx E7xT-x except
-2, -3, -10, -GS
65, 70 E7015-x, E7016-x, F7xx-Exxx, ER70S-x E7xT-x except
E7018-x, E7028-x F7xx-Exx-xx -2, -3, -10, -GS Special features
None
Suggested minimum preheat and interpass temperature for arc welding
Grade Thickness Manual shielded Submerged-arc Notes
(inches) Metal-arc Gas metal-arc Normal uses
Low hydrogen Flux cored-arc * When the base metal This grade is not frequently ordered.
temperature is under
58 Up to incl None* None* 32F, preheat the base
Over to 10.5 incl 70F 70F metal to at least 70F
65, 70 Up to incl None* None*
and maintain this
temperature during Impact toughness
Over to 10.5 incl 70F 70F welding. Impact toughness requirements are not
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical included in the basic specification, but can
depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat
(inches) carbon be added as a supplementary requirement.
and interpass temperatures. In general, the listed temperatures are similar equivalent
values ArcelorMittal USA can furnish the Charpy
to those published in the AWS Structural Welding Code, D1.1.
values shown on this sheet at extra charge.
Welding carbon equivalent = 58 Up to 0.5 incl 0.21 to 0.26
Over 10.5 to 4 incl 0.30 to 0.35 Additional requirements such as deoxidation
Mn Cr + Mo + V Ni + Cu
C
+ 6 + + 15 practice, modified chemistry, special rolling
5 65 Up to 0.5 incl 0.30 to 0.34
The carbon equivalent range shown in the table is based on heat analysis.
Over 0.5 to 10.5 incl 0.32 to 0.37 or heat treatment may be necessary to
It is the range most commonly produced for plates by ArcelorMittal USA. 70 Up to 0.5 incl 0.33 to 0.44 achieve the properties.
Individual plates or heats may have carbon equivalents beyond the
Over 0.5 to 10.5 incl 0.40 to 0.48
range in the table. See Chapter 10, page 38, regarding the significance
of carbon equivalent.

Shaded area denotes availability of A573 plate with Charpy Special notes
15 ft-lb longitudinal impact toughness at various temperatures This grade is available with Integra
or Fineline quality to achieve
Temp. +70F +40F +10F 0F -20F -30F -50F
Thickness improved properties.
(inches)

Up to 10.5

Stress vs. strain curvetensile coupon Typical industrial atmospheric corrosion data

A representative stress vs. strain curve for

a typical 8 in. gauge tensile coupon.

Page 53
 A588 Structural plate steel
Description Standard specification for high-strength, low-alloy structural
Specification covers a grade of steel
for plates, shapes and bars. Only data
steel with 50 ksi (345 mpa) minimum yield point to
applicable to plates is shown. A588 is a 4 inches (100 mm) thick (Specification allows thicknesses to 8 inches with reduced yield point.)
high-strength, low-alloy grade produced Welding data
in three strength levels. ASTM describes Suggested welding consumables for arc welding processes
this grade as being approximately four
times as corrosion resistant as carbon Grade Manual shielded Submerged- Gas Flux Notes
steel without copper. When required, Metal-arc arc metal-arc cored-arc
Low hydrogen
the customer can obtain evidence of
Special welding materials and
its corrosion resistance from ArcelorMittal All E7015, E7016, F7xx-Exxx ER70S-x E7xT-x except procedures, e.g. E80xx-x low
USA. A588 can be made in Grades A E7018, E7028, or -2, -3, -10, -GS alloy electrodes may be
E7015-x, F7xx-Exx-xx required to match the notch
through K. ArcelorMittal USA makes E7016-x, toughness of the base metal,
or for atmospheric corrosion
Grade B under the trade name Mayari- E7018-x and weathering characteristics.
R50. Mayari-R60 and Cor-Ten is
modified A588 Grade B with yield and Suggested minimum preheat and interpass temperature for arc welding
tensile strength higher than A588
Grade Thickness Manual shielded Submerged-arc
specifies. This specification is approved
(inches) Metal-arc Gas metal-arc
for use by the Department of Defense. Low hydrogen Flux cored-arc

Year introduced A, B

Up to incl
Over to 10.5 incl
70F
70F
70F
70F
1968 Over 10.5 to 20.5 incl 150F 150F
Over 20.5 to 8 incl 225F 225F
Special features Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical
A high-strength, corrosion-resistant grade, depend on specific welding conditions and restraint level associated with
(inches) carbon
joint configuration. This table should only be used as a guide for preheat
the oxide of which forms a protective equivalent
and interpass temperatures. In general, the listed temperatures are similar
coating. This grade, while similar to to those published in the AWS Structural Welding Code, D1.1. values
A242, is available in greater thicknesses. Welding carbon equivalent = A, B Up to 10.5 incl 0.28 to 0.45
Over 10.5 to 4 incl 0.33 to 0.47
Mn Cr + Mo + V Ni + Cu
Normal uses C + 6 + 5 + 15 Over 4 to 8 incl 0.35 to 0.50
This corrosion-resistant steel, the oxide The carbon equivalent range shown in the table is based on heat analysis.
of which forms a protective coating, is used It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range
in many painted and unpainted applications in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
(buildings, bridges, industrial equipment,
railroad rolling stock). For bridges, this Shaded area denotes availability of A588 grade B plate with Charpy
grade is specified as A709 Grade 50W. 15 ft-lb longitudinal impact toughness at various temperatures

Impact toughness
Thickness
Temp. +70F +40F +10F 0F -20F -30F -60F
Impact toughness requirements are not (inches)
included in the basic specification, but can
be added as a supplementary requirement. Up to 4 incl
ArcelorMittal USA can furnish the Charpy Over 4 to 6 incl
values shown on this sheet at extra Over 6
charge. Additional requirements, such as
deoxidation practice, modified chemistry,
special rolling or heat treatment may be
Stress vs. strain curvetensile coupon Typical industrial atmospheric corrosion data
necessary to achieve the properties.

Special notes
This grade is available with Integra
or Fineline quality to achieve improved
properties. Post-weld heat treatment may
degrade heat-affected zone strength and
toughness. Pretesting of specific welding
and post-weld heat treating procedures is
recommended to assure optimization of
final property levels.

ASTM color code

Blue and yellow A representative stress vs. strain curve for
a typical 8 in. gauge tensile coupon.

Guidelines for fabricating and processing plate steel

Page 54
Structural plate steel A633

Standard specification for normalized Description

high-strength low-alloy structural steel plates Specification covers a grade of steel
for plates only. The data shown pertains
to plates. The specification allows four
Welding data chemistries, all of which are produced
Suggested welding consumables for arc welding processes by ArcelorMittal USA. Generally
Grade Manual shielded Submerged- Gas Flux Notes furnished in the normalized condition,
Metal-arc arc metal-arc cored-arc the specification permits the plate to
Low hydrogen
be sold without normalizing when the
A, C, D E7015, E7016, F7xx-Exxx, ER70S-x E7xT-x except Deposited weld metal shall customer plans to normalize the plate
E7018, E7028, F7xx-Exx-xx -2, -3, -10, -GS have a minimum impact
strength of 20 ft-lb after fabrication. ArcelorMittal USA will
E7015-x, E7016-x, (27.1J) at 0F (-18C)
E7018-x, E7028-x when Charpy V-Notch
furnish normalizing instructions on the
E E8015-x, E8016-x F8xx-Exx-xx ER80S-x E8xTx-x specimens are used. paperwork accompanying the order. The
specification also permits the addition of
Suggested minimum preheat and interpass temperature for arc welding copper to improve the corrosion resistance
Grade Thickness Manual shielded Submerged-arc of the grade. The pressure vessel version
(inches) Metal-arc Gas metal-arc of this specification if A737.
Low hydrogen Flux cored-arc

A, C, D Up to 10.5 incl 70F 70F

Over 10.5 to 20.5 incl
Over 20.5 to 4 incl
150F
225F
150F
225F
Year introduced
1970
E Up to incl 70F 70F
Over to 10.5 incl 150F 150F
Over 10.5 to 20.5 incl 225F 225F
Over 20.5 to 6 incl 300F 300F
Special features
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical Specification requires normalizing.
depend on specific welding conditions and restraint level associated with (inches) Carbon
joint configuration. This table should only be used as a guide for preheat
Equivalent
and interpass temperatures. In general, the listed temperatures are similar
to those published in the AWS Structural Welding Code, D1.1. Values

Welding carbon equivalent = A Up to 4 0.34 to 0.42 Normal uses

C Up to 4 0.37 to 0.45 Particularly well-suited for low-temperature
Mn Cr + Mo + V Ni + Cu
C
+ 6 + 5 + 15 use where notch toughness is a requirement
D Up to 4 0.40 to 0.50
The carbon equivalent range shown in the table is based on heat analysis. and when strength/weight ratios must be
It is the range most commonly produced for plates by ArcelorMittal USA. E Up to 6 0.45 to 0.55
Individual plates or heats may have carbon equivalents beyond the range
maximum for the application.
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.

Shaded area denotes availability of A633 grades C and E plate with

Charpy 15 ft-lb longitudinal impact toughness at various temperatures Impact toughness
Impact toughness requirements are not
Temp. +70F +40F 0F -20F -40F -60F -80F
Grade Thickness included in the basic specification, but can
(inches) be added as a supplementary requirement.
C Up to 4 ArcelorMittal USA can furnish the Charpy
E Up to 3 incl values shown on this sheet at extra charge.
Additional requirements such as deoxidation
E Over 3 to 6 incl
practice, modified chemistry, special rolling
This table is for Normalized, 0.010 percent maximum sulfur.
or heat treatment may be necessary to
achieve the properties.
Stress vs. strain curvetensile coupon Typical industrial atmospheric corrosion data

Special notes
This grade is available with Integra
or Fineline quality to achieve improved
properties. Post-weld heat treatment may
degrade heat-affected zone strength and
toughness. Pretesting of specific welding
and post-weld heat treating procedures is
recommended to assure optimization of
final property levels.

A representative stress vs. strain curve for

a typical 8 in. gauge tensile coupon.

Page 55
 A656 Structural plate steel
Description Standard specification for hot-rolled
Specification covers a grade of steel for structural steel, high-strength,
plates. Produced as killed steel with fine
grain practice, it is available in four strength
low-alloy plate with improved formability
levels. ASTM allows two types based
on composition. ArcelorMittal USA Welding data
produces Type 7 by a controlled-rolling Suggested welding consumables for arc welding processes
process (see Chapter 4), which results in Grade Manual shielded Submerged- Gas Flux Notes
a plate having formability, weldability and Metal-arc arc metal-arc cored-arc
Low hydrogen
remarkable impact toughness properties.
50 E7015-x, E7016-x, F7xx-Exx-xx ER70S-x E7xT-x except
E7018-x, E7028-x -2, -3, -10, -GS If impact properties are
required, other electrode/
Year introduced 60

E7015-x, E7016-x, F7xx-Exx-xx
E7018-x, E7028-x
ER70S-x E7xT-x except
-2, -3, -10, -GS
flux combinations, as
designated in AWS, can be
1972 specified; for example,
70 E8015-x, E8016-x F8xx-Exx-xx ER80S-x E8xTx-x F7A4-Exx-xx specifies 20
80 E10018-x F10x-Exx-xx ER100S-x E100T1-K3, ft-lb at -60F.
E100T1-K5
Special features
A high-strength, low-alloy steel Suggested minimum preheat and interpass temperature for arc welding
grade with excellent mechanical
Grade Thickness Manual shielded Submerged-arc
and fabricating properties. (inches) Metal-arc Gas metal-arc
Low hydrogen Flux cored-arc

50 Up to 20.5 70F 70F

Normal uses 60 Up to 1.25 70F 70F
Demanding structural applications where
70 Up to 1 70F 70F
strength-to-weight ratios are maximized.
80 Up to 70F 70F
Frequency used as a replacement for
some quenched and tempered plate Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical
depend on specific welding conditions and restraint level associated with
steel grades. Its formability allows joint configuration. This table should only be used as a guide for preheat
(inches) carbon
and interpass temperatures. In general, the listed temperatures are similar equivalent
replacement of multi-piece weldments values
to those published in the AWS Structural Welding Code, D1.1.
with formed parts.
Welding carbon equivalent = 50 Up to 20.5 0.27 to 0.31
Mn Cr + Mo + V Ni + Cu 60 Up to 1.25 0.28 to 0.32
C
+ 6 + 5 + 15

Impact toughness The carbon equivalent range shown in the table is based on heat analysis.
70 Up to 1 0.30 to 0.34

Impact toughness requirements are not It is the range most commonly produced for plates by ArcelorMittal USA. 80 Up to 0.37 to 0.41
Individual plates or heats may have carbon equivalents beyond the range
included in the basic specification, but can in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
be added as a supplementary requirement.
ArcelorMittal USA can furnish the Charpy
Shaded area denotes availability of A656 grade 80 plate with
Charpy 15 ft-lb longitudinal impact toughness at various temperatures
values shown on this sheet at extra charge.
Additional requirements such as deoxidation Temp. +70F +40F +10F 0F -20F -30F -50F
practice, modified chemistry, special rolling Thickness
(inches)
or heat treatment may be necessary to
achieve the properties. Up to

Special notes Typical industrial atmospheric corrosion data

This grade is available with Integra

or Fineline quality to achieve improved

properties. Post-weld heat treatment may
degrade heat-affected zone strength and
toughness. Pretesting of specific welding
and post-weld heat treating procedures is
recommended to assure optimization of
final property levels.

Guidelines for fabricating and processing plate steel

Page 56
Structural plate steel BethStar

Standard specification for low-carbon, Description

low-sulfur, high-strength plate steel for ArcelorMittal USAs BethStar steels
are proprietary grades of steel used for
improved toughness, weldability and formability plates only. BethStar is produced as
killed steel with fine grain practice, and is
Welding data available in four strength levels. They are
Suggested welding consumables for arc welding processes produced by a controlled-rolling process
Grade Manual shielded Submerged- Gas Flux Notes (see Chapter 4), which results in plates
Metal-arc arc metal-arc cored-arc having excellent formability, weldability,
Low hydrogen
and impact toughness properties.
50 E7015-x, E7016-x, F7xx-Exx-xx ER70S-x E7xT-x except BethStar grades are more restrictive
E7018-x, E7028-x -2, -3, -10, -GS
If impact properties are versions of A656.
required, other electrode/
60 E7015-x, E7016-x, F7xx-Exx-xx ER70S-x E7xT-x except flux combinations, as
E7018-x, E7028-x -2, -3, -10, -GS
designated in AWS, can
be specified; for example,
70 E8015-x, E8016-x F8xx-Exx-xx ER80S-x E8xTx-x F7A4-Exx-xx specifies
20 ft-lb at 60F.
Year introduced
80 E10018-x F10xx-Exx-xx ER100S-x E100T1-K3, 1983
E100T1-K5

Suggested minimum preheat and interpass temperature for arc welding

Special features
Grade Thickness Manual shielded Submerged-arc
(inches) Metal-arc Gas metal-arc A high-strength, low-alloy steel grade
Low hydrogen Flux cored-arc with excellent mechanical and
fabricating properties.
50 Up to 20.5 70F 70F
60 Up to 1.25 70F 70F
70 Up to 1 70F 70F
Normal uses
80 Up to 70F 70F
Demanding structural applications where
Preheat and interpass temperatures to prevent hydrogen-assisted cracking
Grade Thickness Typical strength-to-weight ratios are maximized.
depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat (inches) carbon Frequently used as a replacement for some
and interpass temperatures. In general, the listed temperatures are similar equivalent
values quenched and tempered plate steel grades.
to those published in the AWS Structural Welding Code, D1.1.
Its formability allows replacement of multi-
Welding carbon equivalent = 50 Up to 20.5 0.27 to 0.31
piece weldments with formed parts.
Mn Cr + Mo + V Ni + Cu 60 Up to 1.25 0.28 to 0.32
C
+ 6 + 5 + 15
70 Up to 1 0.30 to 0.34
The carbon equivalent range shown in the table is based on heat analysis.
It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range
80 Up to 0.37 to 0.41 Impact toughness
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent. Impact toughness requirements are
included in the specification.
Shaded area denotes availability of BethStar grade 80 plate with
Charpy 15 ft-lb longitudinal impact toughness at various temperatures
Temp. +70F +40F +10F 0F -20F -30F -50F Special notes
Thickness This grade is available with Integra
(inches)
or Fineline quality to achieve
Up to improved properties.

Stress vs. strain curvetensile coupon

A representative stress vs. strain curve for

a typical 8 in. gauge tensile coupon.

Page 57
 A678 Structural plate steel
Description Standard specification for quenched and
Specification covers a carbon grade for tempered carbon steel and high-strength,
plates made to a fine grain practice. The
specification allows three compositions
low-alloy structural steel plates
of which ArcelorMittal USA produces
all three. The plate is heat treated by Welding data
quenching and tempering to develop the Suggested welding consumables for arc welding processes
high strength levels. The specification Grade Manual shielded Submerged- Gas Flux
permits the addition of copper to improve Metal-arc arc metal-arc cored-Arc
Low hydrogen
the corrosion resistance of the plate.
A E7015-x, E7016-x, F7xx-Exx-xx ER70S-x E7xT-x except
E7018-x, E7028-x -2, -3, -10, -GS
B E8015-x, E8016-x, F8xx-Exx-xx ER80S-x E8xTx-x
Year introduced E8018-x
1973 C, D E9015-x, E9016-x, F9xx-Exx-xx ER90S-x E9xTx-x
E9018-x

Special features Suggested minimum preheat and interpass temperature for arc welding
A high-strength steel with notch toughness. Grade Thickness Manual shielded Submerged-arc
(inches) Metal-arc Gas metal-arc
Low hydrogen Flux cored-arc

Normal uses A

Up to incl
Over to 10.5 incl
70F
100F
70F
100F
Demanding structural, industrial and
B, C Up to incl 100F 100F
machinery applications where weight Over to 10.5 incl 150F 150F
Over 10.5 to 2 incl 225F 225F
reduction is important and notch
D Up to incl 100F 100F
toughness is a design consideration. Over to 10.5 incl 175F 175F
Over 10.5 to 3 incl 250F 250F
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical
Impact toughness depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat
(inches) carbon
Impact toughness requirements are not and interpass temperatures. In general, the listed temperatures are similar equivalent
to those published in the AWS Structural Welding Code, D1.1. values
included in the basic specification, but can
Welding carbon equivalent = A Up to 10.5 0.31 to 0.35
be added as a supplementary requirement.
ArcelorMittal USA can furnish the Charpy Mn Cr + Mo + V Ni + Cu B Up to 20.5 0.32 to 0.37
C
+ 6 + 5 + 15
values shown on this sheet at extra charge. C Up to 2 0.39 to 0.45
The carbon equivalent range shown in the table is based on heat analysis.
Additional requirements such as deoxidation It is the range most commonly produced for plates by ArcelorMittal USA. D Up to 3 0.39 to 0.47
Individual plates or heats may have carbon equivalents beyond the range
practice, modified chemistry, special rolling in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
or heat treatment may be necessary to
achieve the properties. Shaded area denotes availability of A678 grade B plate with Charpy
15 ft-lb longitudinal impact toughness at various temperatures
Temp. +70F +40F +10F 0F -20F -30F -50F
Special notes Thickness
(inches)
This grade is available with Integra
or Fineline quality to achieve Up to 20.5
improved properties.

Stress vs. strain curvetensile coupon Typical industrial atmospheric corrosion data

A representative stress vs. strain curve for

a typical 8 in. gauge tensile coupon.
Guidelines for fabricating and processing plate steel

Page 58
Structural plate steel A710

Standard specification for age-hardening Description

low-carbon nickel-copper-chromium-molybdenum-columbium A high-strength alloy plate specification
that provides outstanding formability,
alloy structural steel plates weldability and toughness, it has excellent
CVN toughness and is readily weldable,
Welding data requiring no preheat for many applications.
Suggested welding consumables for arc welding processes It is particularly well-suited for critical
applications such as Navy surface vessel hull
Grade Thickness Manual shielded Submerged- Gas Flux Notes plates and fracture-critical components on
Class (inches) Metal-arc arc metal-arc cored-arc
Low hydrogen offshore drill rigs. The pressure vessel
version of this specification is A736.
A E10015-x, F10xx-Exx-xx ER100S-x E10xTx-x
Class 1 Up to E10016-x, See Special notes
Class 3 Up to 2 incl E10018-x section for
concerns about
Year introduced
A E8015-x, F8xx-Exx-xx ER80S-x E8xTx-x post-weld 1974
Class 3 Over 2 E8016-x, heat treatment.
E8018-x
Special features
This precipitation hardened grade has
Suggested minimum preheat and interpass temperature for arc welding
an excellent combination of strength,
Grade Thickness Manual shielded Submerged-arc Notes toughness and weldability. Other chemistries
(inches) Metal-arc Gas metal-arc
Low hydrogen Flux cored-arc for higher strength levels are also available
Choice of welding
under the ArcelorMittal USA trade name
A Up to 4 incl None None consumable may dictate Spartan.
Class 1, 3 Over 4 to 8 incl 50F 50F preheat requirements.

Preheat and interpass temperatures to prevent hydrogen-assisted cracking

depend on specific welding conditions and restraint level associated with
Class Thickness Typical Normal uses
(inches) carbon
joint configuration. This table should only be used as a guide for preheat Naval surface vessel hull plates. May be
and interpass temperatures. In general, the listed temperatures are similar equivalent
to those published in the AWS Structural Welding Code, D1.1. values ordered to military specification Mil-S-
1, 3 Up to 8 0.42 to 0.48 24645 (SH), which requires high strength
Welding carbon equivalent =
and impact properties, for approved use
Mn Cr + Mo + V Ni + Cu
C
+ 6 + 5 + 15 in critical structural applications.
The carbon equivalent range shown in the table is based on heat analysis.
It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range
Impact toughness
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent. The test results for Class 1 shall meet
an average minimum value of 20 ft-lb
at -50F for longitudinal specimens. For
transverse specimens, the test results
shall meet an average minimum value
of 15 ft-lb at -50F. Impact toughness
guarantees are available for both classes
at test temperatures down to -120F.
Additional requirements such as deoxidation
practice, modified chemistry, special rolling
or heat treatment may be necessary to
achieve the properties.

Special notes
This grade is produced with Fineline
quality to achieve improved properties.
It is important to note this grade of
steel may be susceptible to cracking in
the heat-affected zone of welds during
post-weld heat treatment (stress relief)
or elevated temperature service. Also,
post-weld heat treatment of elevated
temperature service may degrade heat
affected zone toughness. Therefore,
ArcelorMittal USA recommends
careful consideration be given to these
phenomena by competent welding
engineers before application.

Page 59
 A808 Structural plate steel
Description Standard specification for high-strength, low-alloy carbon,
Specification covers a grade of steel manganese, columbium, vanadium steel of structural quality with
plates. A808, a high-strength, low-alloy
grade of steel is made to fine grain practice.
improved notch toughness
The plate may be made by controlled-
finishing temperature rolling practice. The Welding data
specification identifies two levels of sulfur Suggested welding consumables for arc welding processes
content. The supplemental specification Thickness Manual shielded Submerged- Gas Flux
lists the Charpy impact values available. (inches) Metal-arc arc metal-arc cored-Arc
Low hydrogen

Up to 20.5 E7015, E7016, F7xx-Exx-xx ER70S-x E7xT-x except

Year introduced E7018, E7028,
E7015-x, E7016-x,
-2, -3, -10, -GS

1982 E7018-x, E7028-x

Suggested minimum preheat and interpass temperature for arc welding

Special features Thickness Manual shielded Submerged-arc Notes
A grade which may be substituted (inches) Metal-arc Gas metal-arc
for more expensive normalized grades Low hydrogen Flux cored-arc
(A633) in certain applications. * When the base metal
Up to incl None* None* temperature is under
32F, preheat the base
Over to 10.5 incl 70F 70F metal to at least 70F and
maintain this temperature
Over 10.5 to 20.5 incl 150F 150F during welding.
Normal uses
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical
Uses are in applications where depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat
(inches) carbon
notch toughness is an important equivalent
and interpass temperatures. In general, the listed temperatures are similar
design consideration. to those published in the AWS Structural Welding Code, D1.1. values
Welding carbon equivalent = All Up to 20.5 0.30 to 0.44
Mn Cr + Mo + V Ni + Cu
Impact toughness C
+ 6 + 5 + 15

Impact toughness requirements are not The carbon equivalent range shown in the table is based on heat analysis.
It is the range most commonly produced for plates by ArcelorMittal USA.
included in the basic specification, but can Individual plates or heats may have carbon equivalents beyond the range
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
be added as a supplementary requirement.
ArcelorMittal USA can furnish the Charpy Available longitudinal Charpy toughness levels for A808 plate
values shown on this sheet at extra charge.
Additional requirements such as deoxidation Type Temperature Avg. absorb energy (ft-lb)
practice, modified chemistry, special rolling Restricted sulfur (0.010% max.) -20F 55
or heat treatment may be necessary to -50F 45
achieve the properties. Regular sulfur -20F 40
-50F 30

Special notes
Stress vs. strain curvetensile coupon Typical industrial atmospheric corrosion data
This grade is available with Integra
or Fineline quality to achieve improved
properties. Post-weld heat treatment may
degrade heat-affected zone strength and
toughness. Pretesting of specific welding
and post-weld heat treating procedures is
recommended to assure optimization of
final property levels.

A representative stress vs. strain curve for

a typical 8 in. gauge tensile coupon.

Guidelines for fabricating and processing plate steel

Page 60
Structural plate steel A871

Standard specification for high-strength, low-alloy structural steel Description

with atmospheric corrosion resistance Specification covers a grade of steel for
plates. Only data applicable to plates is
This specification permits varied chemistries called Types 1, 2, 3 and 4.
(ArcelorMittal USA makes only Types 1 and 2.) shown. A871 is a high-strength, low-alloy
grade produced in two strength levels.
Welding data ASTM describes this grade as being
Suggested welding consumables for arc welding processes approximately four times as corrosion
Grade Manual shielded Submerged- Gas Flux Notes resistant as carbon steel without copper.
Metal-arc arc metal-arc cored-arc When required, the customer can obtain
Low hydrogen
evidence of its corrosion resistance from
60 E8018-W, F7Ax-Exxx-W, See E80T1-W ArcelorMittal USA. A871 can be made in
unpainted E8016-B1, F7xx-Exxx-W AWS D1.1
Grades 60 and 65.
after E8018-B1
fabrication
60 E7015, F7xx-Exxx ER70S-x E7xT-x except E7015, -16, -18 or -28
painted E7016, -2, -3, -10, -GS can be used for unpainted Year introduced
after E7018, structure in single-pass
fabrication E7028 fillet welds to 0.25 inch 1987
maximum and in single-
65 E8018-W, F8xx-Exx-W See E80T1-W pass groove welds of 0.25
unpainted E8016-B1, AWS D1.1 inch maximum since these
after
fabrication
E8018-B1 welds have high base
metal dilution. Special features
A high-strength, corrosion-resistant grade
65 E8015, F8xx-Exx-xx ER80S-x E8xTx-x
painted E8016, whose oxide forms a protective coating
after E8018 similar to A588.
fabrication

Suggested minimum preheat and interpass temperature for arc welding

Normal uses
Grade Thickness Manual shielded Submerged-arc This corrosion-resistant steel, whose oxide
(inches) Metal-arc Gas metal-arc
Low hydrogen Flux cored-arc forms a protective coating, is used in many
painted and unpainted applications.
60 Up to incl 70F 70F
Over to 10.5 incl 70F 70F
Over 10.5 to 20.5 incl 150F 150F
Over 20.5 to 8 incl 225F 225F
Impact toughness
65 Up to incl 70F 70F Impact toughness requirements are
Over to 10.5 incl 150F 150F
Over 10.5 to 20.5 incl 225F 225F included in the basic specification. To
Over 20.5 to 4 incl 300F 300F 0.5 inch 15 ft-lb at 0F, over 0.5 inch 15
Preheat and interpass temperatures to prevent hydrogen-assisted cracking ft-lb at -20F. Other requirements need to
Grade Thickness Typical
depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat (inches) carbon be inquired. Additional requirements such as
and interpass temperatures. In general, the listed temperatures are similar equivalent deoxidation practice, modified chemistry,
to those published in the AWS Structural Welding Code, D1.1. values
special rolling or heat treatment may be
Welding carbon equivalent = 60 Up to 20.5 incl 0.42 to 0.53
necessary to achieve the properties.
Mn Cr + Mo + V Ni + Cu 60 Over 20.5 to 6 incl 0.47 to 0.57
C + 6 + 5 + 15
65 Up to 10.5 incl 0.42 to 0.53
The carbon equivalent range shown in the table is based on heat analysis.
It is the range most commonly produced for plates by ArcelorMittal USA. 65 Over 10.5 to 4 incl 0.47 to 0.53 Special notes
Individual plates or heats may have carbon equivalents beyond the range
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent. This grade is available with Integra
or Fineline quality to achieve improved
Shaded area denotes availability of A871 grade 60 plate with properties. Post-weld heat treatment may
Charpy 15 ft-lb longitudinal impact toughness at various temperatures degrade heat-affected zone strength and
Temp. +70F +40F +10F 0F -20F -30F -60F toughness. Pretesting of specific welding
Thickness and post-weld heat treating procedures is
(inches)
recommended to assure optimization of
Up to 4 incl final property levels.
Over 4 to 6 incl

con t i n u e d

Page 61
 A871 Structural plate steel

Standard specification for high-strength, low-alloy structural steel

with atmospheric corrosion resistance
con t i n u e d

Stress vs. strain curvetensile coupon Typical industrial atmospheric corrosion data

A representative stress vs. strain curve for

a typical 8 in. gauge tensile coupon.

Guidelines for fabricating and processing plate steel

Page 62
Structural plate steel Hardwear

Standard specification for premium Description

abrasion-resistant plate steel available in ArcelorMittal USA Hardwear
steels are proprietary grades produced
two grades, Hardwear 400F and Hardwear 500F by quenching and tempering to achieve
Welding data two nominal Brinell hardness levels,
Suggested welding consumables for arc welding processes 400HB and 500HB.
Thickness Manual shielded Submerged- Gas Flux
Metal-arc arc metal-arc cored-arc
Low hydrogen
Year introduced
All E7015, E7016, E7xx-Exxx ER70S-x E7xT-x except 1989
E7018, E7028, or -2, -3, -10, -GS
E7015-x, E7016-x, E7xx-Exxx-xx
E7018-x
Special features
Suggested minimum preheat and interpass temperature (F) See special notes High hardness for abrasive resistance
Hardwear 400F
Hardwear 500F with low sulfur levels for improved
heat input (KJ/Inch) heat input (KJ/Inch) weldability and formability.

Individual Plate
Thickness
(inches) 30 35 40 45 Over 45 30 35 40 45 Normal uses
0.5 60 60 60 60 60 200 200 200 200 Abrasive resistant applications in
5
8 60 60 60 60 60 250 200 200 200 mining, quarries and earth-moving.

60 60 60 60 60 300 250 200 200

1 60 60 60 60 60 350 300 250 200
Impact toughness
1.25 60 60 60 60 60 400 300 250 200
Impact requirements may be furnished
10.5 60 60 60 60 60 400 350 300 250
at an extra charge.
2 200 200 200 200 200 400 400 350 300

Suggested minimum preheat and interpass temperature (F) See Special notes
Special notes
Hardwear 400F Hardwear 500F This grade is always produced as
heat input (KJ/Inch) heat input (KJ/Inch)
Fineline. Both tables must be consulted
Combined plate and the higher preheat value used. Preheat
thickness (inches) temperature based on shielded metal-arc
t1 + t2 + t3 30 35 40 45 Over 45 30 35 40 45
welding (SMAW) process and E7018
60 60 60 60 60 200 200 200 200 electrode. E7018 electrodes must be
1 60 60 60 60 60 250 200 200 200 stored in an oven at 250F 25F.
1.25 60 60 60 60 60 300 250 200 200 Maximum exposurefour hours out of the
10.5 60 60 60 60 60 350 300 250 200 can or out of the oven. Preheat minimum
2 60 60 60 60 60 400 350 300 300 temperature may be reduced by 50F
(but not less than 50F) using gas metal-
20.5 60 60 60 60 60 400 350 300 250
arc welding process, ER70S-3 electrode
3 200 200 200 60 60 400 400 350 350
and Ar-CO2 gas. Maximum preheat should
4 250 250 250 200 200 400 400 400 400
be 400F to retain hardness properties.
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical 35 KJ/inch represents approximately a
depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat
(inches) C.E. values 0.25 inch fillet weld (SMAW).
and interpass temperatures. In general, the listed temperatures are similar 400F Up to 3 0.44 to 0.51
to those published in the AWS Structural Welding Code, D1.1.
500F Up to 3 0.53 to 0.58
Welding carbon equivalent =

Mn Cr + Mo + V Ni + Cu
C
+ 6 + 5 + 15 If L is less than or equal
to 0.5 t 2 , consider t 2 = 0.
The carbon equivalent range shown in the table is based on heat analysis.
It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range
t1 t1
in the table. See Chapter 10, page 38, regarding the significance of t3 t2 t2 t3
carbon equivalent.
L L

t1
t2 t3
L

Page 63
Chapter 12 Pressure vessel plate steel

Welding and other data

on pressure vessel plate steel grades

Structural grades
Grade Page number Grade Page number

A204 65 A517 74
A285 66 A533 75
A299 67 A537
76-77
A302 68 A612 78
A387 69 A662 79
A455 70 A737 80
A515 71 A738 81
A516 7273 A841 82

Guidelines for fabricating and processing plate steel

Page 64
Pressure vessel plate steel A204

Standard specification for pressure Description

Specification covers molybdenum
vessel plates, alloy steel, molybdenum alloy plate steel intended particularly
for boilers and other pressure vessels.
Welding data
Suggested welding consumables for arc welding processes
Grade Manual shielded Submerged- Gas Flux
Year introduced
Metal-arc arc metal-arc cored-arc 1937
Low hydrogen

A, B E70xx, F6xx-Exxx, ER70S-x E6xT-x,

E70xx-x F7xx-Exxx, E7xT-x except Special features
F7xx-Exx-xx -2, -3, -10, -GS
This steel is available in three
C E80xx F8xx-Exx-xx ER80S-x E8xTx-x different strength levels.

Suggested minimum preheat and interpass temperature for arc welding

Grade Thickness Manual shielded Submerged-arc Normal uses
(inches) Metal-arc Gas metal-arc
Low hydrogen Flux cored-arc Particularly well suited for boilers.
A popular grade used for elevated
A, B Up to 1 incl 50F 50F
temperature applications.
Over 1 to 2 incl 100F 100F
Over 2 200F 100F
C Up to 1 incl 100F 100F


Over 1 to 2 incl
Over 2
200F
300F
200F
300F
Impact toughness
Impact toughness requirements are not
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical included in the basic specification, but can
depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat
(inches) carbon be added as a supplementary requirement.
and interpass temperatures. In general, the listed temperatures are similar equivalent
to those published in the AWS Structural Welding Code, D1.1. values Additional requirements such as deoxidation

Welding carbon equivalent = A Up to 1 incl 0.42 to 0.48 practice, modified chemistry, special rolling
Over 1 0.44 to 0.56 or heat treatment may be necessary to
Mn Cr + Mo + V Ni + Cu
C
+ 6 + + 15
5 , C Up to 1 incl 0.43 to 0.50
B achieve the properties.
The carbon equivalent range shown in the table is based on heat analysis.
Over 1 0.46 to 0.56
It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent. Special notes
This grade is available with Integra
or Fineline quality to achieve
improved properties.

Page 65
 A285 Pressure vessel plate steel
Description Standard specification for pressure vessel plates,
Specification covers carbon plate steel carbon steel, low and intermediate tensile strength
of low and intermediate tensile strengths.
These plates are intended for fusion welded
pressure vessels. This specification has been Welding data
approved by the Department of Defense Suggested welding consumables for arc welding processes
for listing in the DOD Index of Grade Manual shielded Submerged- Gas Flux
Specifications and Standards. Metal-arc arc metal-arc cored-arc
Low hydrogen

A, B, C E60xx, E70xx, F6xx-Exxx, ER70S-x E6xT-x,

Year introduced

E70xx-x F7xx-Exxx,
F7xx-Exx-xx
E7xT-x except
-2, -3, -10, -GS
1946
Suggested minimum preheat and interpass temperature for arc welding

Special features Grade

Thickness
(inches)
Manual shielded
Metal-arc
Submerged-arc
Gas metal-arc
Notes

This grade is available in three different Low hydrogen Flux cored-arc

strength levels. * When the base metal
A, B, C Up to incl None* None* temperature is under 32F,
Over to 10.5 incl 50F 50F preheat the base metal to at
least 70F and maintain this
Over 10.5 150F 150F temperature during welding.

Normal uses Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical
A widely used, low-cost pressure depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat
(inches) carbon
vessel grade. and interpass temperatures. In general, the listed temperatures are similar equivalent
to those published in the AWS Structural Welding Code, D1.1. values
Welding carbon equivalent = A, B, Up to 10.5 incl 0.14 to 0.37
C Over 10.5 to 20.5 incl 0.14 to 0.39
Impact toughness Mn Cr + Mo + V Ni + Cu
C + 6 + 5 + 15 Over 20.5 to 15 incl 0.14 to 0.42
Impact toughness requirements are not
The carbon equivalent range shown in the table is based on heat analysis.
included in the basic specification, but can It is the range most commonly produced for plates by ArcelorMittal USA.
be added as a supplementary requirement. Individual plates or heats may have carbon equivalents beyond the range
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
ArcelorMittal USA can furnish the Charpy
values shown on this sheet at extra charge. Charpy V-Notch test minimum available requirements per ASTM A20,
Additional requirements such as deoxidation Table A1.15, using Type A (full size specimens). Longitudinal test coupon.
practice, modified chemistry, special rolling
Impact values (ft-lb)
or heat treatment may be necessary to
Grade Thickness Lowest test Avg. 3 specimens Minimum for
achieve the properties. (inches) temp. F one specimen

A Up to 1 incl +40 10 7
Over 1 to 2 incl +60 10 7
Special notes B Up to 1 incl +50 10 7
Plates are normally supplied in the Over 1 to 2 incl +70 10 7
as-rolled condition. This steel may be made C Up to 1 incl +60 10 7
by killed, or semi-killed, steel practices. This Over 1 to 2 incl +80 10 7
grade is available with Integra or Fineline
quality to achieve improved properties.
Stress vs. strain curvetensile coupon

Guidelines for fabricating and processing plate steel

Page 66
Pressure vessel plate steel A299

Standard specification for Description

Specification covers manganese-silicon
pressure vessel plates, carbon steel, manganese-silicon carbon plate steel for use in welded
boilers and other pressure vessels. In
Welding data 1997 the requirement for production
Suggested welding consumables for arc welding processes to a fine austenitic grain size was
added to the specification.
Manual shielded Submerged- Gas Flux
Metal-arc arc metal-arc cored-arc
Low hydrogen

E80xx-x F8xx-Exx-xx ER80S-x E8xTx-x Year introduced

1947
Suggested minimum preheat and interpass temperature for arc welding
Thickness Manual shielded Submerged-arc
(inches) Metal-arc Gas metal-arc Normal uses
Low hydrogen Flux cored-arc Welded boilers and pressure vessels.
Up to 0.5 incl 100F 100F
Over 0.5 to 1 incl 200F 200F
Over 1 to 2 incl 300F 300F
Impact toughness
Impact toughness requirements are not
Over 2 300F 300F
included in the basic specification, but can
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Thickness Typical be added as a supplementary requirement.
depend on specific welding conditions and restraint level associated with
(inches) carbon
joint configuration. This table should only be used as a guide for preheat
equivalent
ArcelorMittal USA can furnish the Charpy
and interpass temperatures. In general, the listed temperatures are similar
to those published in the AWS Structural Welding Code, D1.1. values values shown on this sheet at extra charge.
Welding carbon equivalent = Up to 8 0.38 to 0.57 Additional requirements such as deoxidation
practice, modified chemistry, special rolling
Mn Cr + Mo + V Ni + Cu
C
+ 6 + + 15
5 or heat treatment may be necessary to
The carbon equivalent range shown in the table is based on heat analysis. achieve the properties.
It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.

Charpy V-Notch test minimum available requirements per ASTM A20,

Special notes
This grade is available with Integra
Table A1.15, using Type A (full size specimens). Longitudinal test coupon.
or Fineline quality to achieve
Impact Values (ft-lb) improved properties.
Thickness Lowest test Avg. 3 specimens Minimum for
(inches) temp. F one specimen

Up to 1 incl -75 15 12
Over 1 to 2 incl -75 15 12
Over 2 to 3 incl -50 15 12
Over 3 to 5 incl 0 15 12
Over 5 to 8 incl +30 15 12
Produced to fine grain practice.

Page 67
 A302 Pressure vessel plate steel
Description Standard specification for
Specifications cover manganese- pressure vessel plates, alloy steel, manganese-molybdenum and
molybdenum-nickel alloy plates intended
particularly for welded boilers and other
manganese-molybdenum-nickel
pressure vessels. This specification has been Welding data
approved by the Department of Defense to Suggested welding consumables for arc welding processes
replace Specification QQ-S-691C and for Grade Manual shielded Submerged- Gas Flux
listing in the DOD Index of Specifications Metal-arc arc metal-arc cored-arc
Low hydrogen
and Standards.
A, B, C, D E80xx-x F8xx-Exx-xx ER80S-x E8xTx-x

Year introduced Suggested minimum preheat and interpass temperature for arc welding
1947 Grade Thickness Manual shielded Submerged-arc
(inches) Metal-arc Gas metal-arc
Low hydrogen Flux cored-arc

Special features A, B, C, D Up to 0.5 incl 50F 50F

This steel is available in four grades Over 0.5 to 1 incl 200F 200F
Over 1 to 2 incl 300F 300F
having different strength levels. Over 2 350F 350F
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical
depend on specific welding conditions and restraint level associated with
(inches) carbon
Normal uses joint configuration. This table should only be used as a guide for preheat
and interpass temperatures. In general, the listed temperatures are similar equivalent
to those published in the AWS Structural Welding Code, D1.1. values
Welded boilers and pressure vessels.
Welding carbon equivalent = , B,
A Up to 2 incl 0.45 to 0.68
C, D Over 2 0.45 to 0.68
Mn Cr + Mo + V Ni + Cu
C + 6 + + 15
Impact toughness 5

The carbon equivalent range shown in the table is based on heat analysis.
Impact toughness requirements are not It is the range most commonly produced for plates by ArcelorMittal USA.
included in the basic specification, but can Individual plates or heats may have carbon equivalents beyond the range
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
be added as a supplementary requirement.
Additional requirements such as deoxidation
practice, modified chemistry, special rolling
or heat treatment may be necessary to
achieve the properties.

Special notes
This grade is available with Integra
or Fineline quality to achieve
improved properties.

Guidelines for fabricating and processing plate steel

Page 68
Pressure vessel plate steel A387

Standard specification for pressure vessel plates, Description

alloy steel, chromium-molybdenum Specification covers chromium-molybdenum,
alloy plates which are annealed, normalized
and tempered or quenched and tempered
Welding data depending on grade. The plates are intended
Suggested welding consumables for arc welding processes primarily for welded boilers and pressure
Grade Manual shielded Submerged- Gas Flux vessel designs for elevated temperature and
Metal-arc arc metal-arc cored-arc hydrogen service.
Low hydrogen

2, 12, 11 E8018-B2 F8xx-Exx-xx ER80S-x E8xTx-x

22 E9018-B3 F9xx-Exx-xx ER90S-x E9xTx-x Year introduced
5 E502-15 # # # 1955

# Refer to ArcelorMittal USA.

Suggested minimum preheat and interpass temperature for arc welding Special features
Produced as numerous grades and
Thickness (inches)
classes with increasing levels of chromium and
Grade Up to incl Over
molybdenum. Grades 9 and 91 are
2, 11, 12, 22 200F 300F to 600F also available.
5 300F 400F to 700F

Suggested post-weld heat treatment (PWHT) for arc welding Normal uses
Grade All Thicknesses Notes Recommended for welded pressure vessels.

2, 12 1200F to 1300F for 1 hr/in

Cool to preheat
11, 22 1275F to 1350F for 1 hr/in temperature or below
before PWHT. Impact toughness
5 1300F to 1375F for 1 hr/in Impact toughness requirements are
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical not included in the basic specification,
depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat
(inches) carbon but can be added as a supplementary
and interpass temperatures. In general, the listed temperatures are similar equivalent
values
requirement. Additional requirements
to those published in the AWS Structural Welding Code, D1.1.
such as deoxidation practice, modified
Welding carbon equivalent = 11 Up to 6 0.55 to 0.65
chemistry, special rolling or heat treatment
Mn Cr + Mo + V Ni + Cu 12 Up to 12 0.45 to 0.55
C + 6 + 5 + 15 may be necessary to achieve the properties.
22 Up to 12 0.80 to 0.90 The impact toughness of this specification
The carbon equivalent range shown in the table is based on heat analysis.
It is the range most commonly produced for plates by ArcelorMittal USA. 5 Up to 6 1.10 to 1.30 is strongly influenced by chemistry, heat
Individual plates or heats may have carbon equivalents beyond the range
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent. treatment and required post-weld heat
treatment (PWHT). Contact ArcelorMittal USA
with your specific requirements.

Special notes
This grade is available with Fineline quality to
achieve improved properties.

Page 69
 A455 Pressure vessel plate steel
Description Standard specification for pressure vessel plates,
Specification covers high tensile strength carbon steel, high-strength manganese
carbon manganese plate steel intended
for welded pressure vessels.
Welding data
Suggested welding consumables for arc welding processes
Year introduced Manual shielded Submerged- Gas Flux
1961 Metal-arc arc metal-arc cored-arc
Low hydrogen

E80xx-x F8xx-Exx-xx ER80S-x E8xTx-x

Special features
A higher tensile strength steel, limited Suggested minimum preheat and interpass temperature for arc welding
to 0.75 inch thickness. Thickness Manual shielded Submerged-arc
(inches) Metal-arc Gas metal-arc
Low hydrogen Flux cored-arc

Normal uses Up to 100F 100F

Recommended for welded pressure vessels. Preheat and interpass temperatures to prevent hydrogen-assisted cracking Thickness Typical
depend on specific welding conditions and restraint level associated with
(inches) carbon
joint configuration. This table should only be used as a guide for preheat
and interpass temperatures. In general, the listed temperatures are similar equivalent
Impact toughness to those published in the AWS Structural Welding Code, D1.1. values

Impact toughness requirements are not Welding carbon equivalent = Up to 0.40 to 0.49

included in the basic specification, but can Mn Cr + Mo + V Ni + Cu

C + 6 + 5 + 15
be added as a supplementary requirement.
The carbon equivalent range shown in the table is based on heat analysis.
ArcelorMittal USA can furnish the Charpy It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range
values shown on this sheet at extra charge.
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
Additional requirements such as deoxidation
practice, modified chemistry, special rolling Charpy V-Notch test minimum available requirements per ASTM A20,
or heat treatment may be necessary to Table A1.15, using Type A (full size specimens). Longitudinal test coupon
achieve the properties.
Impact Values (ft-lb)
Thickness Lowest test Avg. 3 specimens Minimum for
(inches) temp. F one specimen
Special notes Up to +25 13 10
This grade is available with Integra
Lateral expansion requirements.
or Fineline quality to achieve
improved properties.
Stress vs. strain curvetensile coupon

Guidelines for fabricating and processing plate steel

Page 70
Pressure vessel plate steel A515

Standard specification for pressure vessel plates, carbon steel, for Description
intermediate and higher temperature service Specification covers carbon-silicon plate steel
primarily for intermediate and higher
temperature service in welded boilers and
Welding data other pressure vessels. This specification has
Suggested welding consumables for arc welding processes been approved by the Department of Defense
Grade Manual shielded Submerged- Gas Flux to replace Federal Specification QQ-S-691C
Metal-arc arc metal-arc cored-arc and listed for listing in the DOD Index of
Low hydrogen
Specifications and Standards.
60, 65, 70 E70xx, F7xx-Exxx, ER70S-x, E6xT-x, E7xT-x except
E70xx-x E70xx-x F7xx-Exx-xx -2, -3, -10, -GS

Suggested minimum preheat and interpass temperature for arc welding

Year introduced
1964
Grade Thickness Manual shielded Submerged-arc Notes
(inches) Metal-arc Gas metal-arc
Low hydrogen Flux cored-arc
Special features
60, 65 Up to incl None* None*
This specification is available in three
Over to 10.5 incl 50F 50F * When the base metal
Over 10.5 to 20.5 incl 150F 150F temperature is under grades having different strength levels
Over 20.5 225F 225F 32F, preheat the base
and is always produced to coarse
metal to at least 70F
70 Up to incl 50F 50F and maintain this austenitic grain size practices.
Over to 10.5 incl 150F 150F temperature during
Over 10.5 to 20.5 incl 250F 250F welding.
Over 20.5 250F 250F
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical
Normal uses
depend on specific welding conditions and restraint level associated with A popular specification used when
(inches) carbon
joint configuration. This table should only be used as a guide for preheat
and interpass temperatures. In general, the listed temperatures are similar equivalent welded boilers and pressure vessels
to those published in the AWS Structural Welding Code, D1.1. values
require intermediate and higher temperature
Welding carbon equivalent = 60 Up to 15 0.19 to 0.45
steel.
Mn Cr + Mo + V Ni + Cu 65 Up to 15 0.27 to 0.45
C
+ 6 + 5 + 15
70 Up to 15 0.31 to 0.49
The carbon equivalent range shown in the table is based on heat analysis.
It is the range most commonly produced for plates by ArcelorMittal USA. Impact toughness
Individual plates or heats may have carbon equivalents beyond the range
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
Impact toughness requirements are
not available for this specification because it is
produced to coarse, austenitic grain
Stress vs. strain curvetensile coupon size practices.

Page 71
 A516 Pressure vessel plate steel
Description Standard specification for pressure vessel plates,
Specification covers carbon plate steel carbon steel, for moderate and lower temperature service
intended primarily for service in welded
pressure vessels. This specification has
been approved by the Department of Welding data
Defense to replace Federal Specification Suggested welding consumables for arc welding processes
QQ-S-691C for listing in the DOD Index Grade Manual shielded Submerged- Gas Flux
of Specifications and Standards. Metal-arc arc metal-arc cored-arc
Low hydrogen

55, 60, E70xx, F7xx-Exxx, ER70S-x E6xT-x,

Year introduced 65, 70

E70xx-x F7xx-Exx-xx E7xT-x except
-2, -3, -10, -GS
1964
Suggested minimum preheat and interpass temperature for arc welding

Special features Grade

Thickness
(inches)
Manual shielded
Metal-arc
Submerged-arc
Gas metal-arc
Notes

This specification is available in four Low hydrogen Flux cored-arc

different strength levels. The steel is made
55, 60, 65 Up to incl None* None*
using a fine austenitic grain size practice. Over to 10.5 incl 50F 50F * When the base metal
Over 10.5 to 20.5 incl 150F 150F temperature is under
Over 20.5 225F 225F 32F, preheat the base
metal to at least 70F
70 Up to incl 50F 50F
Normal uses Over to 10.5 incl 150F 150F
and maintain this
temperature during
A popular specification used where Over 10.5 to 20.5 incl 250F 250F welding.
Over 20.5 250F 250F
improved notch toughness is important
at lower temperatures. Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical
depend on specific welding conditions and restraint level associated with
(inches) carbon
joint configuration. This table should only be used as a guide for preheat
and interpass temperatures. In general, the listed temperatures are similar equivalent
to those published in the AWS Structural Welding Code, D1.1. values
Impact toughness Welding carbon equivalent = 60 Up to 15 0.31 to 0.42
Impact toughness requirements are not
Mn Cr + Mo + V Ni + Cu 65 Up to 15 0.35 to 0.42
included in the basic specification, but can C
+ 6 + 5 + 15
70 Up to 15 0.36 to 0.46
be added as a supplementary requirement. The carbon equivalent range shown in the table is based on heat analysis.
ArcelorMittal USA can furnish the Charpy It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range
values shown on this sheet at extra charge. in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
Additional requirements such as deoxidation
practice, modified chemistry, special rolling
Shaded area denotes availability of A516 plate with Charpy
15 ft-lb longitudinal impact toughness at various temperatures
or heat treatment may be necessary to
achieve the properties. Post-weld heat Temp. +70F +40F +0F -20F -40F -60F -75F
Grade Thickness
treatment requirements may also influence
(inches)
available Charpy impact properties.
50, 60 Up to 2 incl
Over 2 to 5 incl
Special notes Over 5 to 12 incl
This grade is available with Integra 65, 70 Up to 1 incl
or Fineline quality to achieve Over 1 to 3 incl
improved properties. Over 3 to 8 incl
Over 8 to 10 incl
This table is for Normalized, 0.025 percent maximum sulfur.

con t i n u e d
Guidelines for fabricating and processing plate steel

Page 72
Pressure vessel plate steel A516

Standard specification for pressure vessel plates,

carbon steel, for moderate and lower temperature service
con t i n u e d
Stress vs. strain curvetensile coupon

Page 73
 A517 Pressure vessel plate steel
Description Standard specification for pressure vessel plates,
Specification covers high-strength
quenched and tempered alloy steel
alloy steel, high strength, quenched and tempered
plates intended for use in fusion welded (ArcelorMittal USA makes only A514 Grades A, B, E, F, H, P and Q.)
boilers and other pressure vessels. This
specification has been approved by the
Welding data
Department of Defense for listing in Suggested welding consumables for arc welding processes1
the DOD Index of Specifications and Thickness Manual shielded Submerged- Gas Flux Notes
Standards. The structural version of (inches) Metal-arc arc metal-arc cored-arc
this specification is A514. Low hydrogen

Year introduced Up to
20.5 incl
E11015-x, E11016-x, F11xx-Exx-xx
E11018-x
ER110S-x E11xTx-x See Special notes
section for concerns
1964 about post-weld heat
Over E10015-x, E10016-x, F10xx-Exx-xx ER100S-x E10xTx-x treatment.
20.5 E10018-x
Special features
Of the 13 compositions permitted, 1 Deposited weld metal shall have a minimum impact strength of 20 ft-lb
(27.1J) at 0F (-18C) when Charpy V-Notch specimens are required.
ArcelorMittal USA produces Grades
A, B, E, F, H, P and Q. The steels are made
using a fine austenitic grain size practice.
Suggested minimum preheat and interpass temperatures for welding
Thickness Produced to Produced to minimum
Normal uses (inches) A517 tensile properties Brinell hardness requirements
Excellent for fusion welded boilers and for abrasion resistant applications
other pressure vessels. The chemistries
Up to incl 50F 100F
of the A517 grades are often used to
produce abrasion resistant grades to Over to 10.5 incl 125F 150F
minimum Brinell requirements. Welding Over 10.5 to 20.5 incl 175F 200F
information is also provided for them. Over 20.5 225F 250F

Impact toughness A preheat or interpass temperature above the minimum shown may be required
for highly restrained weldspreheat or interpass temperatures should not exceed
Grade Thickness Typical
Impact toughness requirements are not 400F for thickness up to 1.5 inch.
(inches) carbon
included in the basic specification, but can equivalent
Preheat and interpass temperatures to prevent hydrogen-assisted cracking depend values
be added as a supplementary requirement. on specific welding conditions and restraint level associated with joint configuration.
ArcelorMittal USA can furnish the Charpy This table should only be used as a guide for preheat and interpass temperatures. In A Up to 1.25 0.45 to 0.55
values shown on this sheet at extra charge. general, the listed temperatures are similar to those published in the AWS Structural
Welding Code, D1.1. B Up to 1.25 0.40 to 0.53
Additional requirements such as deoxidation
Welding carbon equivalent = E Up to 6 0.70 to 0.80
practice, modified chemistry, special rolling
or heat treatment may be necessary to Mn Cr + Mo + V Ni + Cu F Up to 2.25 0.50 to 0.60
C + 6 + 5 + 15
achieve the properties. H Up to 2 0.50 to 0.60
The carbon equivalent range shown in the table is based on heat analysis. It is the
P Up to 4 0.60 to 0.70
Special notes range most commonly produced for plates by ArcelorMittal USA. Individual plates or
heats may have carbon equivalents beyond the range in the table. See Chapter 10,
Because of its critical alloy content and page 38, regarding the significance of carbon equivalent.
Q Up to 6 0.75 to 0.85
specialized properties, welding procedures
are of fundamental importance especially in Charpy V-Notch test minimum available requirements per ASTM A20,
the heat affected zone. Table A1.15, using Type A (full size specimens). Transverse test coupon.
This grade is available with Integra Grade Thickness Lowest test Impact values (ft-lb)
or Fineline quality to achieve (inches) temp. F
improved properties.
Grades A, E, PPost-weld heat All All Testing temperature as None specified by ASTM A20
specified by the customer, (Lateral expansion
treatment may degrade heat-affected but no higher than 32F requirements below)
zone strength and toughness. Pretesting
of specific welding and post-weld heat Lateral expansion requirements: 0.015 in. minimum lateral expansion required using a full size transverse test coupon.
treating procedures is recommended to
assure optimization of final property levels.
Grades B, F, H, QIt is important to
note this grade of steel may be susceptible
to cracking in the heat-affected zone of
welds during post-weld heat treatment
(stress relief). Therefore, ArcelorMittal USA
recommends careful consideration be given
to this phenomenon by competent welding
engineers before stress relieving is applied
to weldments of this grade. Also, it is not
recommended for service at temperatures
lower than -50F or higher than 800F.

Guidelines for fabricating and processing plate steel

Page 74
Pressure vessel plate steel A533

Standard specification for pressure vessel plates, Description

alloy steel, quenched and tempered, manganese-molybdenum Specification covers manganese-
molybdenum and manganese-
and manganese-molybdenum-nickel molybdenum-nickel alloy plate steel
Welding data for use in the quenched and tempered
Suggested welding consumables for arc welding processes condition for the construction of
Class Manual shielded Submerged- Gas Flux welded pressure vessels.
Metal-arc arc metal-arc cored-arc
Low hydrogen

1 E80xx-x F8xx-Exx-xx ER80S-x E8xTx-x Year introduced

2 E90xx-x F9xx-Exx-xx ER90S-x E9xTx-x 1965
3 E100xx-x F10xx-Exx-xx ER100S-x E100T1-K3,
E100T5-K3
Special features
Suggested minimum preheat and interpass temperature for arc welding This specification is available in four
Grade Thickness Manual shielded Submerged-arc types of chemical analysis and three
(inches) Metal-arc Gas metal-arc classes of different strength levels.
Low hydrogen Flux cored-arc

A, B, Up to 1 incl 200F 200F

C, D 1 to 2 incl 300F 300F
Over 2 400F 400F Normal uses
Often used in the beltline region
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical
depend on specific welding conditions and restraint level associated with of nuclear reactor vessels where the
joint configuration. This table should only be used as a guide for preheat
(inches) carbon
equivalent properties may be affected by high
and interpass temperatures. In general, the listed temperatures are similar
to those published in the AWS Structural Welding Code, D1.1. values levels of radiation.
Welding carbon equivalent = , B,
A Up to 12 0.48 to 0.67
C, D
Mn Cr + Mo + V Ni + Cu
C + 6 + + 15
5
Impact toughness
The carbon equivalent range shown in the table is based on heat analysis. Impact toughness requirements are not
It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range included in the basic specification, but can
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
be added as a supplementary requirement.
Additional requirements such as deoxidation
practice, modified chemistry, special rolling
or heat treatment may be necessary to
achieve the properties.

Special notes
This alloy plate steel in the as-rolled
condition is sensitive to cracking during
transit and handling, particularly in the
thicknesses over 1 in. or 2 in. It should be
shipped in the as-rolled condition only
with the mutual agreement of the
manufacturer and fabricator.

This grade is available with Integra

or Fineline quality to achieve
improved properties.

Page 75
 A537 Pressure vessel plate steel
Description Standard specification for pressure vessel plates,
Specification covers heat treated heat-treated carbon-manganese-silicon steel
carbon-manganese-silicon plate steel
intended for fusion welded pressure
vessels and structures. Welding data
Suggested welding consumables for arc welding processes
Class Manual shielded Submerged- Gas Flux Notes
Year introduced Metal-arc arc metal-arc cored-arc
Low hydrogen If deposited weld metal
1965
should have a minimum
1 E7015-x, E7016-x, F7xx-Exxx, ER70S-x E7xT-x except impact strength, see the
E7018-x, F7xx-Exx-xx -2, -3, -10, -GS appropriate AWS
E7028-x specification for impact
Special features 2, 3 E8015-x, E8016-x F8xx-Exx-xx ER80S-x E8xTx-x
requirements of specific
welding consumable
This grade is available in three classes, designations.
Class 1 normalized and Class 2 and 3 Suggested minimum preheat and interpass temperature for arc welding
quenched and tempered. The steel
is made using a fine austenitic grain Class Thickness Manual shielded Submerged-arc
(inches) Metal-arc Gas metal-arc
size practice. Low hydrogen Flux cored-arc

1, 2, 3 Up to 1 incl 70F 70F

Over 1 to 10.5 incl 100F 100F
Normal uses Over 10.5 to 20.5 incl 150F 150F
Over 20.5 to 6 incl 225F 225F
Welded pressure vessels.
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Class Thickness Typical
depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat
(inches) carbon
equivalent
Impact toughness and interpass temperatures. In general, the listed temperatures are similar
to those published in the AWS Structural Welding Code, D1.1. values
Impact toughness requirements are not 1 Up to 4 0.39 to 0.54
Welding carbon equivalent =
included in the basic specification, but can
Mn Cr + Mo + V Ni + Cu 2, 3 Up to 6 0.40 to 0.55
be added as a supplementary requirement. C + 6 + 5 + 15

ArcelorMittal USA can furnish the Charpy The carbon equivalent range shown in the table is based on heat analysis.
It is the range most commonly produced for plates by ArcelorMittal USA.
values shown on this sheet at extra charge. Individual plates or heats may have carbon equivalents beyond the range
Additional requirements such as deoxidation in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.

practice, modified chemistry, special rolling

Charpy V-Notch test minimum available requirements per ASTM A20,
or heat treatment may be necessary to
Table A1.15, using Type A (full size specimens). Longitudinal test coupon
achieve the properties.
Impact Values (ft-lb)
Class Thickness Lowest test Avg. 3 specimens Minimum for
Special notes (inches) temp. F one specimen

This grade is available with Integra 1 Up to 1 incl -80 15 12

Over 1 to 20.5 incl -75 15 12
or Fineline quality to achieve
Over 20.5 to 3 incl -75 13 10
improved properties. Over 3 to 4 incl -50 13 10
2, 3 Up to 1 incl -90 20 15
Over 1 to 20.5 incl -90 20 15
Over 20.5 to 3 incl -75 15 12
Over 3 to 4 incl -50 15 12

con t i n u e d
Guidelines for fabricating and processing plate steel

Page 76
Pressure vessel plate steel A537

Standard specification for pressure vessel plates,

heat-treated carbon-manganese-silicon steel
con t i n u e d
Stress vs. strain curvetensile coupon

Page 77
 A612 Pressure vessel plate steel
Description Standard specification for pressure vessel plates,
Specification covers killed carbon- carbon steel, high strength, for moderate and
manganese-silicon plate steel intended
for welded pressure vessels in service at
lower temperature service
moderate and lower temperatures. Welding data
Suggested welding consumables for arc welding processes
Grade Manual shielded Submerged- Gas Flux
Year introduced Metal-arc arc metal-arc cored-arc
Low hydrogen
1970
All E80xx-x, F8xx-Exx-xx, ER80S-x, E8xTx-x,
E90xx-x F9xx-Exx-xx ER90S-x E9xTx-x
Special features Suggested minimum preheat and interpass temperature for arc welding
This steel is killed and made using a
fine austenitic grain size practice. Grade Thickness Manual shielded Submerged-arc
(inches) Metal-arc Gas metal-arc
Low hydrogen Flux cored-arc

Normal uses All

Up to 0.5 incl
Over 0.5 to 1 incl
100F
150F
100F
150F
Welded pressure vessels requiring moderate
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Thickness Typical
or lower temperatures, particularly railway depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat
(inches) carbon
tank cars. equivalent
and interpass temperatures. In general, the listed temperatures are similar
to those published in the AWS Structural Welding Code, D1.1. values
Welding carbon equivalent = Up to 1 0.44 to 0.52
Impact toughness Mn Cr + Mo + V Ni + Cu
C
+ 6 + 5 + 15
Impact toughness requirements are not
included in the basic specification, but can The carbon equivalent range shown in the table is based on heat analysis.
It is the range most commonly produced for plates by ArcelorMittal USA.
be added as a supplementary requirement. Individual plates or heats may have carbon equivalents beyond the range
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
ArcelorMittal USA can furnish the Charpy
values shown on this sheet at extra charge.
Charpy V-Notch test minimum available requirements per ASTM A20,
Additional requirements such as deoxidation Table A1.15, using Type A (full size specimens). Longitudinal test coupon
practice, modified chemistry, special rolling
or heat treatment may be necessary to Impact Values (ft-lb)
achieve the properties. Grade Thickness Lowest test Avg. 3 specimens Minimum for
(inches) temp. F one specimen

All Up to 1 -50 20 15
Special notes
This grade is available with Integra
or Fineline quality to achieve improved Stress vs. strain curvetensile coupon

properties. Post-weld heat treatment may

degrade heat-affected zone strength and
toughness. Pretesting of specific welding
and post-weld heat treating procedures is
recommended to assure optimization of
final property levels.

Guidelines for fabricating and processing plate steel

Page 78
Pressure vessel plate steel A662

Standard specification for pressure vessel plates, Description

carbon-manganese-silicon steel for Specification covers carbon-manganese
plate steel intended primarily for
moderate and lower temperature service service in welded pressure vessels
Welding data where improved low temperature
Suggested welding consumables for arc welding processes notch toughness is important.
Grade Manual shielded Submerged- Gas Flux
Metal-arc arc metal-arc cored-arc
Low hydrogen
Year introduced
A, B, C E70xx, F7xx-Exxx, ER70S-x E7xT-x except 1972
E70xx-x F7xx-Exx-xx -2, -3, -10, -GS

Suggested minimum preheat and interpass temperature for arc welding

Special features
Grade Thickness Manual shielded Submerged-arc This material is available in three
(inches) Metal-arc Gas metal-arc
Low hydrogen Flux cored-arc grades having different strength levels.
The steel is made using a fine austenitic
A, B, C Up to 1 incl 50F 50F
grain size practice.
Over 1 to 2 incl 100F 100F
Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical
depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat
and interpass temperatures. In general, the listed temperatures are similar


(inches) carbon
equivalent Normal uses
to those published in the AWS Structural Welding Code, D1.1. values Welded pressure vessels where
Welding carbon equivalent = A, B, C Up to 2 0.37 to 0.48 low temperature notch toughness
Mn Cr + Mo + V Ni + Cu is important.
C
+ 6 + 5 + 15

The carbon equivalent range shown in the table is based on heat analysis.
It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range Impact toughness
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
Impact toughness requirements are not

Charpy V-Notch test minimum available requirements per ASTM A20, included in the basic specification, but can
Table A1.15, using Type A (full size specimens). Longitudinal test coupon be added as a supplementary requirement.
ArcelorMittal USA can furnish the Charpy
Impact Values (ft-lb) values shown on this sheet at extra charge.
Grade Thickness Lowest test Avg. 3 specimens Minimum for
Additional requirements such as deoxidation
(inches) temp. F one specimen
practice, modified chemistry, special rolling
A Up to 2 -75 13 10 or heat treatment may be necessary to
B Up to 2 -60 13 10 achieve the properties.
C Up to 2 -50 15 12

Special notes
This grade is available with Integra
or Fineline quality to achieve
improved properties.

Page 79
 A737 Pressure vessel plate steel
Description Standard specification for pressure vessel plates,
Specification covers high-strength and high-strength, low-alloy steel
low-alloy plate steel for service in welded
pressure vessels and piping components.
The structural version of this specification Welding data
is A633. Suggested welding consumables for arc welding processes
Grade Manual shielded Submerged- Gas Flux
Metal-arc arc metal-arc cored-arc
Year introduced Low hydrogen

1976 B E70xx, E70xx-x F7xx-Exxx ER70S-x E7xT-x

C E80xx-x F8xx-Exx-xx ER80S-x E8xTx-x

Special features Suggested minimum preheat and interpass temperature for arc welding
This specification is available in two Grade Thickness Manual shielded Submerged-arc
different strength levels. The steel is made (inches) Metal-arc Gas metal-arc
Low hydrogen Flux cored-arc
using a fine austenitic grain size practice.
B, C Up to incl 50F 50F
Over to 1 incl 100F 100F
Over 1 to 10.5 incl 150F 150F
Normal uses Over 10.5 to 2 incl 200F 200F
Used for piping and pressure vessel Over 2 250F 250F
applications where high strength and Preheat and interpass temperatures to prevent hydrogen-assisted cracking Grade Thickness Typical
depend on specific welding conditions and restraint level associated with
improved toughness are required. joint configuration. This table should only be used as a guide for preheat
(inches) carbon
and interpass temperatures. In general, the listed temperatures are similar equivalent
to those published in the AWS Structural Welding Code, D1.1. values
B Up to 4 0.38 to 0.46
Impact toughness Welding carbon equivalent =

Impact toughness requirements are not Mn Cr + Mo + V Ni + Cu C Up to 4 0.45 to 0.57

C
+ 6 + 5 + 15
included in the basic specification, but can
The carbon equivalent range shown in the table is based on heat analysis.
be added as a supplementary requirement. It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range
ArcelorMittal USA can furnish the Charpy in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
values shown on this sheet at extra charge.
Additional requirements such as deoxidation Shaded area denotes availability of A737 Grade B and C plate with
practice, modified chemistry, special rolling Charpy 15 ft-lb longitudinal impact toughness at various temperatures
or heat treatment may be necessary to Temp. +70F +40F +0F -20F -40F -60F -80F
achieve the properties. Grade Thickness
(inches)

B Up to 4
Special notes C Up to 3 incl
Because of its critical alloy content and C Over 3 to 6 incl
specialized properties, welding procedures
This table is for Normalized, 0.010 percent maximum sulfur.
are of fundamental importance, especially
in the heat affected zone.
Stress vs. strain curvetensile coupon
This grade is available with Integra
or Fineline quality to achieve improved
properties. Post-weld heat treatment may
degrade heat-affected zone strength and
toughness. Pretesting of specific welding
and post-weld heat treating procedures is
recommended to assure optimization of
final property levels.

Guidelines for fabricating and processing plate steel

Page 80
Pressure vessel plate steel A738

Standard specification for pressure vessel plates, Description

heat-treated, carbon-manganese-silicon steel, Specification covers heat treated
carbon-manganese-silicon plate steel
for moderate and lower temperature service intended for use in welded pressure
Welding data vessels at moderate and lower
Suggested welding consumables for arc welding processes temperature service.
Grade Thickness Manual shielded Submerged- Gas Flux
(inches) Metal-arc arc metal-arc cored-arc
Low hydrogen
Year introduced
A All E80xx-x F8xx-Exxx, ER80S-x E8xTx-x 1976
F8xx-Exx-xx
B All E90xx-x F9xx-Exx-xx ER90S-x E9xTx-x
C Up to 20.5 incl E90xx-x F9xx-Exx-xx ER90S-x E9xTx-x Special features
Over 20.5 E80xx-x F8xx-Exx-xx ER80S-x E8xTx-x
This specification is available in three
grades with different strength levels.
Suggested minimum preheat and interpass temperature for arc welding
Grade Thickness Manual shielded Submerged-arc
(inches) Metal-arc Gas metal-arc
Low hydrogen Flux cored-arc Normal uses
Used for welded pressure vessels requiring
A, B, C Up to 0.5 incl 100F 100F
Over 0.5 to 1 incl 150F 150F moderate and lower temperature service.
Over 1 to 2 incl 200F 200F
Over 2 250F 250F
Preheat and interpass temperatures to prevent hydrogen-assisted cracking
depend on specific welding conditions and restraint level associated with
Grade Thickness Typical Impact toughness
joint configuration. This table should only be used as a guide for preheat
(inches) carbon Impact toughness requirements are not
and interpass temperatures. In general, the listed temperatures are similar equivalent
values included in the basic specification, but can
to those published in the AWS Structural Welding Code, D1.1.
be added as a supplementary requirement.
Welding carbon equivalent = A, B Up to 6 0.46 to 0.54
Additional requirements such as deoxidation
Mn Cr + Mo + V Ni + Cu
C
+ 6 + 5 + 15 practice, modified chemistry, special rolling
The carbon equivalent range shown in the table is based on heat analysis. or heat treatment may be necessary to
It is the range most commonly produced for plates by ArcelorMittal USA. achieve the properties. The impact
Individual plates or heats may have carbon equivalents beyond the range
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent. toughness of this specification is strongly
influenced by chemistry, heat treatment
and required post-weld heat treatment.
Contact ArcelorMittal USA with your specific
requirements.

Special notes
Grade A is the material that, prior to
1984, was covered by specification
A738 without a grade designation.

This grade is available with Integra

or Fineline quality to achieve
improved properties.

Page 81
 A841 Pressure vessel plate steel
Description Standard specification for plate steel for pressure vessels
Specification covers plate steel produced by produced by thermo-mechanical-control-process (TMCP)
the thermo-mechanical-control-process
(TMCP) (see Chapter 4). The plates are
intended primarily for use in welded Welding data
pressure vessels. Suggested welding consumables for arc welding processes
Manual shielded Submerged- Gas Flux
Metal-arc arc metal-arc cored-arc
Year introduced Low hydrogen

1985 E7015-x, E7016-x, F7xx-Exxx, ER70S-x E7xT-x except

E7018-x, E7028-x F7xx-Exx-xx -2, -3, -10, -GS

Suggested minimum preheat and interpass temperature for arc welding

Special features
This specification is available in Thickness Manual shielded Submerged-arc Notes
(inches) Metal-arc Gas metal-arc
two strength levels. Low hydrogen Flux cored-arc

Up to incl None* None* * When the base metal

temperature is under
Normal uses Over to 10.5 incl 70F 70F 32F, preheat the base
metal to at least 70F and
Used for welded pressure vessels. Over 10.5 to 20.5 incl 150F 150F maintain this temperature
Over 20.5 to 4 incl 225F 225F during welding.

Preheat and interpass temperatures to prevent hydrogen-assisted cracking

Impact toughness depend on specific welding conditions and restraint level associated with
joint configuration. This table should only be used as a guide for preheat
Thickness Typical
(inches) carbon
Impact toughness requirements are a and interpass temperatures. In general, the listed temperatures are similar equivalent
to those published in the AWS Structural Welding Code, D1.1. values
part of the basic specification. Test results
of 10 mm x 10 mm specimens shall meet Welding carbon equivalent = Up to 20.5 incl 0.30 to 0.35
an average minimum value of 15 ft-lb Mn Cr + Mo + V Ni + Cu Over 20.5 to 4 incl 0.35 to 0.40
C + 6 + 5 + 15
at -40F. Tests per ASTM A20.
The carbon equivalent range shown in the table is based on heat analysis.
It is the range most commonly produced for plates by ArcelorMittal USA.
Individual plates or heats may have carbon equivalents beyond the range
in the table. See Chapter 10, page 38, regarding the significance of carbon equivalent.
Special notes
This grade is available with Integra
or Fineline quality to achieve improved
properties. Post-weld heat treatment may
degrade heat-affected zone strength and
toughness. Pretesting of specific welding
and post-weld heat treating procedures is
recommended to assure optimization of
final property levels. The TMCP heating
and rolling practices are defined in
Fig. X1.1 of specification A841.

Guidelines for fabricating and processing plate steel

Page 82
Physical properties of plate steel

Page 83
Chapter 13 Physical properties of plate steel

Physical Properties of Plate Steel

Item English Units Metric Units

Specific gravity 7.9 7.9

Density 490 lb/ft3 7850 kg/m3

Melting point 2370F2640F 1300C-1450C

Specific heat 0.12 Btu 0.12 (Cal)

(lb) (F) (gr) (C)

Linear coefficient of 6.5 x 10 - 6 1 (11.7) x 10 -6 1

thermal expansion F C

Volumetric coefficient 19.5 x 10 - 6 1 (35.1) x 10 -6 1

of thermal expansion F C

Thermal conductivity at 60F 34 (Btu) 0.14 (Cal)

(hr) (ft) (F) (sec) (cm) (C)

Electrical resistivity at 60F 17 x 10 -8 (ohm-meters)

Speed of sound through steel 18,000 ft/sec 5490 m/sec

Youngs modulus 29,000,000 lb 2 207,000 MPa

of elasticity (in)

Poissons ratio, 0.3 in the elastic range and 0.5 in the plastic range

Bulk modulus 23,000,000 lb 2 159,000 MPa

(in)

Shear modulus 12,000,000 lb 2 83,000 MPa

(in)

Emissivity of polished .07 at 100F .07 at 38C

metal surface .10 at 500F .10 at 260C
.14 at 1000F .14 at 540C

Emissivity of oxidized 0.80 0.80

plate steel at 60F

The properties listed above vary with the chemistry of the plate steel.
The values shown are typical for non-alloy plate grades.
If more accuracy is required, refer to a physics handbook.

Guidelines for fabricating and processing plate steel

Page 84
Glossary

Page 85
 Glossary
Accelerated cooling. Cooling the plate with water immediately following the final rolling operation.
Generally the plate is water cooled from about 1400F to approximately 1100F.

Aging. A time-dependent change in the properties of certain steels that occurs at ambient or moderately
elevated temperatures after hot-working, after a thermal treatment (quench aging), or after a cold-working
operation (strain aging).

Allow steel. Steel is considered to be an alloy steel when either (1) the maximum of the range given for
the content of alloying elements exceeds one or more of the following percentages: manganese 1.65
percent, silicon 0.60 percent, copper 0.60 percent; or (2) a definite range or definite minimum quantity of
those elements considered alloys is specified. For example, chromium, molybdenum and nickel.

Annealing. A thermal cycle involving heating to, and holding at, a suitable temperature and then cooling at
a suitable rate, for such purposes as reducing hardness, improving machinability, facilitating cold-working,
producing a desired microstructure, or obtaining desired mechanical or other properties.

Austenitizing. The process of forming the austenite phase by heating a ferrous alloy into the
transformation range (partial austenitizing above the lower critical temperature) or above this range
(complete austenitizing above the upper critical temperature).

Bainite. A decomposition product of austenite consisting of an aggregate of ferrite and carbide. In general,
it forms at temperatures lower than those where very fine pearlite forms, and higher than those where
martensite begins to form on cooling.

Brinell Hardness Number (HB). A measure of hardness determined by the Brinell hardness test, in which
a hard steel ball under a specific load is forced into the surface of the test material. The number is derived by
dividing the applied load by the surface area of the resulting impression.

Camber. As it relates to plates, camber is the horizontal edge curvature in the length, measured over the
entire length of the plate.

Carbon steel. By common custom, steel is considered to be carbon steel when no minimum content is
specified or required for aluminum, boron, chromium, cobalt, columbium, molybdenum, nickel, titanium,
tungsten, vanadium, zirconium or any other element added to obtain a desired alloying effect; when the
specified minimum for copper does not exceed 0.40 percent; or when the maximum content specified for
any of the following elements does not exceed the percentages: manganese 1.65 percent, silicon 0.60
percent, copper 0.60 percent. Small amounts of alloying elements may be present and are considered
incidental.

Carburizing. A process in which an austenitized ferrous material is brought into contact with a
carbonaceous atmosphere or medium of sufficient carbon potential as to cause absorption of carbon at the
surface and, by diffusion, create a concentration gradient. Hardening by quenching follows.

Cold cracking. Develops in a weldment after solidification. It forms within hours or days after welding,
depending on steel grade, residual stresses and hydrogen content. Proper processing will prevent this
problem.

Continuous casting. The most popular technique for solidifying steel. Involves pouring steel into an
intermediate tundish before entering a water-cooled, copper mold. A solidifying steel strand is drawn
through a machine where it continues to cool before exiting the machine.

Controlled cooling. A process by which steel is cooled from an elevated temperature in a predetermined
manner to avoid hardening, cracking or internal damage, or to produce desired microstructure or mechanical
properties.

Controlled-rolling. A rolling practice that improves mechanical properties by controlling the related
parameters of time-temperature and deformation.

Guidelines for fabricating and processing plate steel

Page 86
Glossary
Corrosion. The gradual degradation of steel caused by atmosphere, moisture or other agents. Can also lead to
cracking of various forms, e.g., stress corrosion cracking, hydrogen induced cracking and sulfide stress cracking.

Creep. A time-dependent deformation of steel occurring under conditions of elevated temperature

accompanied by stress intensities well within the apparent elastic limit for the temperature involved.

Critical range (Temperatures). Synonymous with transformation range, which is the preferred term.
(See Austenitizing)

Decarburization. The loss of carbon from the surface of steel as a result of heating in a medium that
reacts with the carbon.

Deoxidation. A process used during melting and refining of steel to remove and/or chemically combine
oxygen from the molten steel to prevent porosity in the steel when it is solidified.

Ductility. The ability of a material to deform plastically without fracturing, usually measured by
elongation or reduction of area in a tension test, or, for flat products such as sheet, by height of cupping
in an Erichsen test.

Elastic limit. The greatest stress a steel can see without permanent deformation.

Elongation. A measure of ductility, determined by the amount of permanent extension achieved by a tension
test specimen, and expressed as a percentage of that specimens original gauge length (as: 25 percent in 2 in.).

End-quench hardenability test (Jominy test). A method for determining the hardenability of steel by
water-quenching one end of an austenitized cylindrical test specimen and measuring the resulting hardness at
specified distances from the quench end.

Endurance limit. The maximum cyclic stress, usually expressed in pounds per square inch, to which a metal
can be subjected for indefinitely long periods without damage or failure.

Extensometer. An instrument capable of measuring small magnitudes of strain occurring in a specimen

during a tension test, conventionally used when a stress-strain diagram is to be plotted.

Ferrite. The room temperature form of alpha iron, one of the two major constituents of steel (with
cementite) in which it acts as the solvent to form solid solutions with such elements as manganese, nickel,
silicon and, to a small degree, carbon.

Flame hardening. A hardening process in which the surface is heated by direct flame impingement and
then quenched.

Grain size number. An arbitrary number calculated from the average number of individual crystals, or
grains, that appear on the etched surface of a specimen.

Hardenability. The property of steel that determines the depth and distribution of hardness induced on
cooling after austenitizing.

Hardness. The resistance of a material to plastic deformation. Usually measured in steels by the Brinell,
Rockwell or Vickers indentation-hardness test methods.

Heat affected zone. Portion of the base plate, that was heated during a thermal cutting or welding
operation.

High-strength, low-alloy steels. A specific group of steels with chemical compositions especially
developed to impart higher mechanical properties and, in certain instances, improved atmospheric corrosion
resistance relative to conventional carbon steel. It is not considered to be an alloy steel as previously
described, even though use of any intentionally added alloy content would technically qualify it as such.
Typical grades are A572 and A588.

Page 87
 Glossary
Ingot casting. A technique for solidifying molten steel by pouring it into cast iron ingot molds.

Impact test. A test for determining the ability of a steel to withstand high-velocity loading, as measured by
the energy (in ft-lb) that a notched-bar specimen absorbs upon fracturing.

Martensite. A microconstituent or structure in hardened steel, characterized by an acicular or needle-like

pattern, and having the maximum hardness of any of the decomposition products of an austenite.

Mechanical properties. Properties that reveal the reactions, elastic and inelastic, of a material to applied
forces. Sometimes defined erroneously as physical properties.

Microstructure. The metallurgical structure for a steel determined by polishing and etching samples and
examining them at high magnifications using light or electron optical methods. Examples include ferrite,
pearlite, bainite and martensite.

Modulus of elasticity (Youngs modulus). A measure of stiffness, or rigidity, expressed in pounds per
square inch. Developed from the ratio of the stress, as applied to a tension test specimen, to the corresponding
strain or elongation of the specimen. Applicable for tensile loads below the elastic limit of the material.

Notch (impact) toughness. An indication of a steels capacity to absorb energy when a stress
concentrator or notch is present. Examples are Charpy V-Notch, dynamic tear, drop-weight and drop-weight
tear tests.

Normalizing. A thermal treatment consisting of heating to a suitable temperature above the transformation
range and then cooling in still air. Usually employed to improve toughness or machinability, or as a preparation
for further heat treatment.

Pearlite. A microconstituent of iron and steel consisting of a lamellar aggregate of ferrite and cementite (a
compound of iron and carbonFe3C).

Physical properties. Properties pertaining to the physics of a material, such as density, electrical
conductivity and coefficient of thermal expansion. Not to be confused with mechanical properties.

Post-weld heat treatment (PWHT). Also referred to as stress relieving, this process is used to soften
the heat affected zones and relieve residual stresses created during welding.

Preheating. A process to heat plate prior to thermal cutting or welding to prevent hard areas or cracking.

Proportional limit. The maximum stress at which strain remains directly proportional to stress.

Quench cracking. Occurs in medium carbon and alloy steels during quenching and tempering heat
treatment. Proper part design, heat treating and quenching practices will prevent this problem.

Quenching and tempering. A thermal process used to increase the hardness and strength of steel. It
consists of austenitizing, then cooling at a rate sufficient to achieve partial or complete transformation to
martensite. Tempering involves reheating to a temperature below the transformation range and then cooling
at any rate desired. Tempering improves ductility and toughness, but reduces the quenched hardness by an
amount determined by the tempering temperature and time.

Reduction of area. A measure of ductility determined by the difference between the original cross-
sectional area of a tension test specimen and the area of its smallest cross-section at the point of fracture.
Expressed as a percentage of the original area.

Rockwell hardness (HRB OR HRC). A measure of hardness determined by the Rockwell hardness tester,
by which a diamond spheroconical penetrator (Rockwell C scale) or a hard steel ball (Rockwell B scale) is
forced into the surface of the test material under sequential minor and major loads. The difference between
the depths of impressions from the two loads is read directly on the arbitrarily calibrated dial as the Rockwell
hardness value.
Guidelines for fabricating and processing plate steel

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Glossary
Spherodized annealing. A prolonged heating of the steel in a controlled-atmosphere furnace at or near the
lower critical point, followed by retarded cooling in the furnaces, to produce a lower hardness than can be
obtained by regular annealing.

Steckel mill. A rolling mill design with heated coiling furnaces on each side to allow efficient rolling of thin
plate products.

Stress-cracking. Occurs during the thermal cutting of high carbon and alloy steels at the cut edges. Proper
processing, which may include preheating, will prevent this problem.

Stress relieving. A thermal cycle involving heating to a suitable temperature, usually 1000F to 1200F,
holding long enough to reduce residual stresses from either cold deformation or thermal treatment, and then
cooling slowly enough to minimize the development of new residual stresses.

Temper embrittlement. Brittleness that results when certain steels are held within, or are cooled slowly
through, a specific range of temperatures below the transformation range. The brittleness is revealed by
notched-bar impact tests at or below room temperature.

Tempering. See Quenching and tempering.

Tensile strength. The maximum tensile stress in pounds per square inch that a material is capable of
sustaining, as developed by a tension test.

Tension test. A test in which a machined or full-section specimen is subjected to a measured axial load
sufficient to cause fracture. The usual information derived includes the elastic properties, ultimate tensile
strength, and elongation and reduction of area.

Thermal cutting. A process for cutting plate steel to size using an oxy-fuel, plasma or laser heat source.
Oxidation or burning of steel is initiated by melting with the heat source and then a stream of high purity
oxygen continues the reaction.

Thermo-mechanical-controlled-processing (TMCP). A term referring to special rolling practices that

use controlled-rolling and/or accelerated cooling.

Thermal treatment. Any operation involving the heating and cooling of a metal or alloy in the solid state to
obtain the desired microstructure or mechanical properties.

Tool steel. Steel with a higher carbon and alloy content. Used to make tools for cutting, forming or otherwise
shaping a material into a part or component for a definite use.

Toughness. An indication of a steels capacity to absorb energy, particularly in the presence of a notch or a
crack.

Transformation ranges. Those ranges of temperatures within which austenite forms during heating and
transforms during cooling.

Transformation temperatures. The temperature at which a change in phase occurs. The term is
sometimes used to denote the limiting temperature of a transformation range.

Yield point. The minimum stress at which a marked increase in strain occurs without an increase in stress, as
indicated by a sharp knee in the stress-strain curve.

Yield strength. The stress at which a material exhibits a specified deviation from the proportionality of
stress to strain. The deviation is expressed in terms of strain, and in the offset method, usually a strain of 0.2
percent is specified.

Young's modulus. See Modulus of elasticity.

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Guidelines for fabricating and processing plate steel

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