ArcelorMittal USA

Plate
API Steels: For Offshore Structures

ArcelorMittal USA has a long history of providing the API Grades

2H, 2MT1, and 2Y plate steel for the fabrication of offshore drilling and production platforms. This includes providing plates for the
Shell Auger (1993), B. P. Pompano (1993), Amerada Hess Baldpate
(1996/7), Exxon Petronius (1997), El Paso Prince (1999/00) offshore platforms. ArcelorMittal USA plate facilities in Burns Harbor, IN
and Coatesville and Conshohocken, PA each have unique capabilities
that benefit this market. These three mills supply the widest range
of plate sizes and grades in North America.

Facilities

ArcelorMittal USAs facilities allow the production of plates as

follows:

Table 1
General Plate Availability
Thickness
Width
Length
Weight

To 28" (711 mm)

To 195" (4953 mm)
Up to 1500" (38.1 m)
Pattern weights to 50 tons (45 t)

ArcelorMittal USA can also normalize or quench and temper (Q&T)

plates in these plate sizes. The Burns Harbor 160 plate mill also has
the capability to perform thermo-mechanical-controlled-processing
(TMCP), including interrupted accelerated cooling (IAC). A schematic
of these processes is shown in Figure 1. The plate sizes that can be
specifically produced at each plant using the additional processing are
shown in Table 2.

Figure 1
Processes for Producing Plate Steels
Conventional
Processing

2400
2000

Heat Treatment

Hot
Rolling

Normalizing

1200

Air Cool

Air Cool

Air Cool

400

Accelerated
Cooling

Quenching & Tempering

d
er Coole
Air or Wat

800

Controlled
Rolling

ray Air Cool

Water Sp

1600

Thermo-Mechanical
Controlled Processing (TMCP)

uench
Water Q

Temperature, F

Introduction

Table 2
ArcelorMittal USAs Available Processes (1)
(thickness, width, length, maxs. or range in inches)
Location

Normalizing

Q&T

Figure 3
Carbon Equivalent Distribution
33 Heats of API-2Y-50
10

TMCP

Burns Harbor
4", 150", 600"
4", 150", 600"
1.25", 120", 480-1400"
Coatesville
28", 195", 540" (2) 28", 195", 540" (2)
Conshohocken 3", 99", 700" (3)
1", 99", 500"
(1) total plate weight will limit availability refer to ArcelorMittal USA for plate
outside these limits

(2) lengths to 650" available, please refer to ArcelorMittal USA Plate offices

(3) lengths to 800" available, please refer to ArcelorMittal USA Plate offices

The availability of TMCP is of significant value towards providing API2MT1 grades. TMCP also allows the production of longer plates.
The layout of the Burns Harbor mill showing the accelerated cooling
unit is presented in Figure 2. The 2-stand mill also has an interstand
cooling system, which is critical in the production of thicker TMCP
plates.
ArcelorMittal USA has the capability to produce by continuous casting, as well as bottom-poured ingot casting. Furthermore, low sulfur
levels with calcium inclusion shape control are available with Integra
and Fineline processing. The Fineline processing of the Coatesville,
PA melt shop can meet 0.001% maximum sulfur levels in popular
steel grades. This melt shop also has the capability to meet very
stringent chemical controls, such as in carbon equivalent maximums.
This is demonstrated in Figure 3 for recent melting of API-2Y-50
steels. The excellent Charpy-V-Notch impact toughness performance for this grade is shown in Figure 4.

0
35.5

36.0

36.5

37.0

Carbon Equivalent (IIW)

* specification requirement is 0.39 maximum

Figure 4
Distribution of Average CVN Energies
110 API-2Y-50 Plates
Transverse at -40F, 0.75-2.5" Thick
60

Frequency

40
20
0*
100

140

180

220

260

300

340

380

Energy ft-lbs.
* specification requirement is 30ft-lbs. minimum

API-RP-2Z Pre-Qualification

RP-2Z pre-qualification of API-2Y-50/60 has been successfully

completed at Coatesville for plates 3 in. (76 mm) thick.

Figure 2
Burns Harbor 160" Plate Mill
Continuous
Furnace
2-High
Roughing
Stand

In & Out
Furnace

API Steels Page 2

Descale
Box

4-High
Finishing
Stand

Interstand
Cooling
System

Pre-Leveler

Isotope
Thickness
Gauge

Accelerated Cooling Unit

3500-Ton
Primary
Leveler

American Petroleum Institute Specifications

(Supplementary Requirements available)

SPECIFICATION

API 2H
Grade 42

API 2H
Grade 50

API 2Y**s
Grade 50

API 2Ys
Grade 60

API-2MT-1

Type of Steel

HSLA

HSLA

HSLA

HSLA

HSLA

Requirements for Delivery

A6

A6

A6

A6

A6

Tensile Strength (ksi)

62/82

70/90

65 Min.

75 Min.

70/90

Yield Strength (Min. ksi)

42
(Yield Point if designated YP)

50 to 2" incl.;
47 over 2"

50/75 to 1" incl.;

50/70 over 1"

60/90 to 1" incl.;

60/85 over 1"

50

Spec. Thickness (Max. in.)

ArcelorMittal USA
Thickness (Max. in.)

Chemical Composition (%)

Unless a range is specified, individual values are maximums

Carbon

.18

.18

.16

.16

.15

Manganese

.90/1.60

1.15/1.60

1.15/1.60

1.15/1.60

1.15/1.60

Phosphorus

.030

.030

.030

.030

.030

Sulfur

.010

.010

.010

.010

.010

Silicon

.05/.40

.05/.40

.15/.50

.15/.50

.15/.40

Chromium

.25

.25

Nickel

.75

1.0

Molybdenum

.08

.15

Copper

.35

.35

Other Elements

.020/.06 Al
.04 Cb
.020 Ti
.012 N
.0100 Ce
Ce, N, B, V, Zr
not intentionally added
F/G/P

.020/.06 Al
.01/.04 Cb
.020 Ti
.012 N
.0100 Ce
Ce, N, B, V, Zr
not intentionally added
F/G/P

.020/.06 Al
.03 Cb
.012 N
.003/.02 Ti (based on N)
N, B, V, Zr, Ce
not intentionally added
F/G/P

.020/.06 Al
.03 Cb
.012 N
.003/.02 Ti (based on N)
N, B, V, Zr, Ce
not intentionally added
F/G/P

.010/.040 Cb
.020/.060 Al
.080 V
.020 Ti
.012 N
.010 Ce
N, Zr or B
not intentionally added

Heat Treatment Required

Q&T

Q&T

As rolled, N or Q&T

Remarks

CE .43 to 2" incl.;

.45 over 2"
TCVN Req.

CE .43 to 2" incl.;

.45 over 2"
TCVN Req.

CE .39 to 1" incl.;

.41 to 3" incl.;
.43 to 6"
TCVN Req.

CE .42 to 1" incl.;

.45 to 4"
TCVN Req.

CE .43 to 2" incl.;

.45 to 2"

* Residuals must be reported.

** A Grade 42 is also available with properties and chemistry of API-2W Grade 42.
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.

CE (IIW) = C + Mn/6 + (Cr+Mo+V)/5 + (Cu+Ni)/15

s The Coatesville mill is prequalified to API RP-2Z with Supplement S11 to 3 inches thick.

Supplementary Requirements from Appendix A in 2H and 2Y

S1 Ultrasonic Examination
S2
Notch Toughness at Lower Temperature
2H S3 Individual Plate Testing
2Y S3 A
 dditional Tension Test
S4
T
 hrough-Thickness (Z-Direction) Testing
S5
L ow Sulfur Steel for Improved Through-Thickness Properties
2H S7 L ow Nitrogen Content For Improved Notch Toughness in StrainHardened Condition
2Y S7 L ow Nitrogen Content For Improved Notch Toughness in Strain-Aged
Condition

API Steels Page 3

S8
2Y S9
2Y S10
2Y S11

S
 train-Aged Charpy V-Notch Impact Tests
Simulations of Postweld Heat Treatment
Hardness Testing
Preproduction Qualification (available only for Coatesville product to
3" max.)
2H S12 N
 otch Toughness Using Drop Weight
2Y S12 N
 otch Toughness Using Drop-Weight Testing
S13
S
 urface Quality
S14
Thickness Tolerance

Quality Assurance Systems

All of the ArcelorMittal USA plate facilities are certified to ISO 90012000 and ANSI/ISO14001 and are audited semi-annually. Additional certification of all facilities has been performed by ABS, DNV,
TUV and DoD. Additionally, customer, end-user and internal audits
of ArcelorMittal USA facilities are regularly performed.

Grades

The principal steels for offshore structures are the API grades listed
in the preceding pages. ArcelorMittal USA also has a number of
other grades that are of interest to this market, for example:

A709 HPS 70W A high strength Q&T or TMCP plate steel with improved
weldability, toughness and weathering characteristics for bridge
applications
LQ-690
A high strength 100 ksi (690 MPa) Q&T alloy steel with excellent
toughness {30 ft-lbs. (40J)@-76F (-60C) long.} through 7 in.
(178 mm) thick
Duracorr
A 12% chromium, utility stainless steel (ASTM A1010) with 50
ksi (345 MPa) minimum yield strength, which excels in marine
environments
LQ-130
A 130 ksi (896 MPa) minimum yield strength, Q&T alloy steel
through 3 in. (76 mm) thick
Spartan
A family of Cu-Ni, Q&T high strength alloy steels, which can meet
the requirements of ASTM A710 and the Navys HSLA-80/100

Burns Harbor 160" Mill Accelerated Cooling Unit

Refer to the ArcelorMittal USAs website at: www.arcelormittal.com

for more information on these and other plate steel grades.

Contacts

If further information or clarification is required,

contact T +1 800 966 5352. Additional technical
information is also available by emailing Martin Francis
at martin.francis@arcelormittal.com
or calling T +1 610 383 2069.

All information in this brochure is for the purpose of information only. ArcelorMittal USA reserves the right to change its product range at any time without prior notice.

ArcelorMittal USA
Corporate Office
1 South Dearborn Street
18th Floor
Chicago, IL 60603-9888
USA

ArcelorMittal USA
Plate
ARC Building
139 Modena Road
Coatesville, PA 19320-0911
USA

T +1 800 422 9422

www.arcelormittal.com

T +1 800 966 5352

www.arcelormittal.com

ArcelorMittal USA
Plate
250 West U.S. Highway 12
Burns Harbor, IN 46304-9745
USA
T +1 800 422 9422
www.arcelormittal.com

September 2013