Designation: A 960/A 960M 07

Standard Specification for

Common Requirements for Wrought Steel Piping Fittings1
This standard is issued under the fixed designation A 960/A 960M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope* Combining values from the two systems may result in noncon-
1.1 This specification covers a group of common require- formance with the specification. The inch-pound units shall
ments that shall apply to wrought steel piping fittings covered apply unless the M designation [SI] of the product specifi-
in any of the following individual product specifications or any cation is specified in the order.
other ASTM specification that invokes this specification or 2. Referenced Documents
portions thereof:
Title of Specification ASTM
2.1 ASTM Standards: 2
Designation A 29/A 29M Specification for Steel Bars, Carbon and Alloy,
Specification for Piping Fittings of Wrought A 234/A 234M Hot-Wrought, General Requirements for
Carbon Steel and Alloy Steel for Moderate and
Elevated Temperatures
A 234/A 234M Specification for Piping Fittings of Wrought
Specification for Wrought Austenitic Stainless A 403/A 403M Carbon Steel and Alloy Steel for Moderate and High
Steel Piping Fittings Temperature Service
Specification for Piping Fittings of Wrought Carbon A 420/A 420M
Steel and Alloy Steel for Low-Temperature Service
A 262 Practices for Detecting Susceptibility to Intergranu-
Specification for Butt-Welding, Wrought-Carbon A 758/A 758M lar Attack in Austenitic Stainless Steels
Steel, Piping Fittings with Improved Notch Toughness A 370 Test Methods and Definitions for Mechanical Testing
Specification for As-Welded Wrought Austenitic A 774/A 774M
Stainless Steel Fittings for General Corrosive of Steel Products
Service at Low and Moderate Temperatures A 388/A 388M Practice for Ultrasonic Examination of
Specification for Wrought Ferritic, Ferritic/Austenitic, A 815/A 815M Heavy Steel Forgings
and Martensitic Stainless Steel Piping Fittings
Specification for Heat-Treated Carbon Steel A 858/A 858M A 403/A 403M Specification for Wrought Austenitic Stain-
Fittings for Low-Temperature and Corrosive Service less Steel Piping Fittings
Specification for Wrought High-Strength A 860/A 860M A 420/A 420M Specification for Piping Fittings of Wrought
Low-Alloy Steel Butt-Welded Fittings
Carbon Steel and Alloy Steel for Low-Temperature Ser-
1.2 In case of conflict between a requirement of the indi- vice
vidual product specification and a requirement of this general A 700 Practices for Packaging, Marking, and Loading
requirement specification, the requirements of the individual Methods for Steel Products for Shipment
product specification shall prevail over those of this specifica- A 751 Test Methods, Practices, and Terminology for
tion. Chemical Analysis of Steel Products
1.3 By mutual agreement between the purchaser and the A 758/A 758M Specification for Wrought-Carbon Steel
supplier, additional requirements may be specified (See 4.1.7). Butt-Welding Piping Fittings with Improved Notch Tough-
The acceptance of any such additional requirements shall be ness
dependent on negotiations with the supplier and must be A 763 Practices for Detecting Susceptibility to Intergranu-
included in the order as agreed upon by the purchaser and lar Attack in Ferritic Stainless Steels
supplier. A 774/A 774M Specification for As-Welded Wrought Aus-
1.4 The values stated in either inch-pound units or SI units tenitic Stainless Steel Fittings for General Corrosive Ser-
[metric] are to be regarded separately as standard. Within the vice at Low and Moderate Temperatures
text and the tables, the SI units are shown in brackets. The A 815/A 815M Specification for Wrought Ferritic, Ferritic/
values stated in each system are not exact equivalents; there- Austenitic, and Martensitic Stainless Steel Piping Fittings
fore each system must be used independently of the other. A 858/A 858M Specification for Heat-Treated Carbon Steel
Fittings for Low-Temperature and Corrosive Service

1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
2
A01.22 on Steel Forgings and Wrought Fittings for Piping Applications and Bolting For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Materials for Piping and Special Purpose Applications. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Feb. 1, 2007. Published February 2007. Originally Standards volume information, refer to the standards Document Summary page on
approved in 1996. Last previous edition approved in 2006 as A 960/A 960M06. the ASTM website.

*A Summary of Changes section appears at the end of this standard.

Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.

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 A 960/A 960M 07
A 860/A 860M Specification for Wrought High-Strength machine and must deform the material to produce an essen-
Low-Alloy Steel Butt-Welding Fittings tially wrought structure throughout the material cross section.
A 941 Terminology Relating to Steel, Stainless Steel, Re- 3.2 DefinitionsFor definitions of other terms used in this
lated Alloys, and Ferroalloys specification, refer to Terminology A 941.
A 967 Specification for Chemical Passivation Treatments
for Stainless Steel Parts 4. Ordering Information
E 165 Test Method for Liquid Penetrant Examination 4.1 It is the purchasers responsibility to specify in the
E 213 Practice for Ultrasonic Examination of Metal Pipe purchase order all ordering information necessary to purchase
and Tubing the needed material. Examples of such information include but
E 709 Guide for Magnetic Particle Examination are not limited to the following:
E 1916 Guide for Identification and/or Segregation of 4.1.1 Quantity,
Mixed Lots of Metals 4.1.2 Description of fitting and nominal dimensions (stan-
2.2 Military Standard:3 dard or special),
MIL-STD-163 Steel Mill Products, Preparation for Ship- 4.1.3 Steel composition by grade and class designation,
ment and Storage 4.1.4 Construction, seamless or welded (unless seamless or
2.3 Manufacturers Standardization Society Standards:4 welded construction is specified by the purchaser, either may
MSS-SP-25 The Standard Marking System of Valves, be furnished at the option of the supplier),
Fittings, Flanges and Unions 4.1.5 Specification number (including the year/date of is-
MSS-SP-43 Standard Practice for Light Weight Stainless sue),
Steel Butt-Welding Fittings 4.1.6 Supplementary requirements, and
MSS-SP-75 Specification for High Test Wrought Butt- 4.1.7 Additional requirements.
Welding Fittings
MSS-SP-79 Socket Welding Reducer Inserts 5. Material
MSS-SP-95 Swage(d) Nipples and Bull Plugs 5.1 The material for fittings shall consist of forgings, bars,
2.4 American Society of Nondestructive Testing:5 plates and seamless or welded tubular products.
SNT-TC-1A Recommended Practice for Nondestructive 5.2 The steel shall conform to the chemical requirements of
Testing Personnel Qualification and Certification the individual product specification and may be made from any
2.5 ASME Standards:6 process.
B16.9 Steel Butt-Welding Fittings 5.3 Ferritic steels shall be fully killed.
B16.11 Forged Steel Fittings, Socket Welding and Threaded 5.4 If secondary melting is employed, the heat shall be
Section IX Welding Qualifications defined as all ingots remelted from a primary heat.
3. Terminology
6. Manufacture
3.1 Definitions of Terms Specific to This Standard:
3.1.1 bara solid section that is long in relationship to its 6.1 Forging or shaping operations may be performed by any
cross sectional dimensions, with a relatively constant cross of the methods included in the individual product specification.
section throughout its length. (See Specification A 29/A 29M 6.2 Hollow cylindrically shaped parts up to and including
for definitions relating to the production of hot wrought and NPS 4 may be machined from bar or seamless tubular material
cold finished bars.) provided the axial length of the part is approximately parallel
3.1.2 certifying organizationthe company or association to the axial length of the fitting. Elbows, return bends, tees and
responsible for the conformance of, the marking of, and the header tees shall not be machined directly from bar stock.
certification of the product to the specification requirements. 6.3 Fittings, after forming at an elevated temperature, shall
3.1.3 fittinga component for non-bolted joints used in be cooled to a temperature below the critical range under
piping systems and pressure vessels. suitable conditions to prevent injury by cooling too rapidly.
3.1.4 flangea component for bolted joints used in piping 6.4 All classes of fittings shall have the welders, welding
systems and pressure vessels. operators, and welding procedures qualified under the provi-
3.1.5 forgingthe product of a substantially compressive sion of Section IX of the ASME Boiler and Pressure Vessel
hot or cold plastic working operation that consolidates the Code except that welds from the original pipe manufacturer
material and produces the required shape. made without the addition of filler metal do not require such
3.1.6 DiscussionThe plastic working must be performed qualification.
by a forging machine, such as a hammer, press, or ring rolling
7. Heat Treatment
3
7.1 Fittings requiring heat treatment shall be treated as
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098. specified in the individual product specification using the
4
Available from Manufacturers Standardization Society of the Valve and Fittings following procedures:
Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602.
5
7.1.1 Full AnnealingFittings shall be uniformly reheated
Available from The American Society for Nondestructive Testing (ASNT), P.O.
to a temperature above the transformation range and, after
Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518.
6
Available from American Society of Mechanical Engineers (ASME), ASME holding for a sufficient time at this temperature, cooled slowly
International Headquarters, Three Park Ave., New York, NY 10016-5990. to a temperature below the transformation range.

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 A 960/A 960M 07
7.1.2 Solution AnnealingFittings shall be heated to a TABLE 1 Product Analysis Tolerances for Low Alloy and Carbon
temperature that causes the carbides to go into solution and SteelsA
then quenched in water or rapidly cooled by other means to Permissible Variations
Limit, or Maximum of
Elements Over Maximum Limit or
prevent reprecipitation. Specified Range, %
Under Minimum Limit, %
7.1.3 Isothermal AnnealingIsothermal annealing shall Carbon 0.30 and under 0.01
consist of austenitizing a ferrous alloy and then cooling to and over 0.30 to 0.75, incl 0.02
over 0.75 0.03
holding within the range of temperature at which the austenite Manganese 0.90 and under 0.03
transforms to a relatively soft ferrite-carbide aggregate. over 0.90 to 2.10, incl 0.04
Phosphorus over maximum only 0.005
7.1.4 NormalizingFittings shall be uniformly reheated to Sulfur 0.060 and under 0.005
a temperature above the transformation range and subsequently Silicon 0.40 and under 0.02
cooled in air at room temperature. over 0.40 to 2.20, incl 0.05
Nickel 1.00 and under 0.03
7.1.5 Tempering and Post-Weld Heat TreatmentFittings over 1.00 to 2.00, incl 0.05
shall be reheated to the prescribed temperature below the over 2.00 to 5.30, incl 0.07
over 5.30 to 10.00, incl 0.10
transformation range, held at temperature for the greater of 12 Chromium 0.90 and under 0.03
h or 1 h/in. [25.4 mm] of thickness at the thickest section and over 0.90 to 2.10, incl 0.05
cooled in still air. over 2.10 to 3.99, incl 0.10
Molybdenum 0.20 and under 0.01
7.1.6 Stress RelievingFittings shall be uniformly heated to over 0.20 to 0.40, incl 0.02
the selected stress relieving temperature. The temperature shall over 0.40 to 1.15, incl 0.03
Vanadium 0.10 and under 0.01
not vary from the selected temperature by more than 6 25 F over 0.10 to 0.25, incl 0.02
[6 14 C]. over 0.25 to 0.50, incl 0.03
minimum value specified, 0.01
7.1.7 Quench and TemperFittings shall be fully austen- under minimum limit
itized and immediately quenched in a suitable liquid medium. only
The quenched fittings shall be reheated to a minimum tempera- Columbium (Niobium) Up to and incl 0.14 0.02
0.15 to 0.50, incl 0.06
ture of 1100 F [590 C] and cooled in still air. Titanium Up to and incl 0.85 0.05
Aluminum 0.10 and under 0.03
over 0.10 to 0.20, incl 0.04
8. Chemical Requirements Chemical Requirements
over 0.20 to 0.30, incl 0.05
8.1 Chemical AnalysisSamples for chemical analysis and over 0.30 to 0.80, incl 0.07
over 0.80 to 1.80, incl 0.10
methods of analysis shall be in accordance with Test Methods, LeadB 0.15 to 0.35, incl 0.03
Practices and Terminology A 751 for Chemical Analysis of Copper to 1.00 incl 0.03
over 1.00 to 2.00, incl 0.05
Steel Products.
A
Chrome content less than 4.00.
8.2 Heat AnalysisAn analysis of each heat of steel shall B
Product analysis tolerance for lead applies both over and under to a specified
be made by the manufacturer to determine the percentages of range of 0.15 to 0.35 %.
those elements specified in the individual product specification.
If secondary melting processes are employed, the heat analysis
9. Mechanical Requirements
shall be obtained from one remelted ingot of each primary
melt. The chemical analysis thus determined shall conform to 9.1 Method of Mechanical TestAll tests shall be con-
the requirements of the individual product specification. Note ducted in accordance with Test Methods and Definitions A 370.
that the product analysis (check analysis) tolerances are not to 9.2 The test specimen shall represent all material from the
be applied to the heat analysis requirements. same heat and heat treatment load whose maximum thick-
nesses do not exceed the thickness of the test specimen or
8.2.1 For steels ordered under product specifications refer-
blank by more than 14 in. [6 mm].
encing this specification of general requirements, the steel shall 9.3 One tension test at room temperature shall be made in
not contain an unspecified element, other than nitrogen for accordance with 9.2 from each heat in each heat treatment load.
stainless steels, for the ordered grade to the extent that the steel 9.3.1 If heat treatment is performed in either a continuous or
conforms to the requirements of another grade for which that batch type furnace controlled within 6 25 F [6 14 C] of the
element is a specified element having a required minimum required heat treatment temperature and equipped with record-
content. For this requirement, a grade is defined as an alloy ing pyrometers so that complete records of heat treatment are
described individually and identified by its own UNS or grade available, and if the same heat treating cycles are used on the
designation in a table of chemical requirements within any material represented by the tension test, then one tension test
specification listed within the scope as being covered by this from each heat shall be required, instead of one tension test
specification. from each heat in each heat treatment load in accordance with
8.3 Product AnalysisIf a product analysis is performed it 9.2.
shall be in accordance with Test Methods, Practices, and 9.4 RetestWhen a retest is permitted by the product
Terminology A 751. The chemical composition thus deter- specification, it shall be performed on twice the number of
mined shall conform to limits of the product specification, representative specimens that were originally nonconforming.
within the permissible variations of Table 1 or Table 2 of this When any retest specimen does not conform to the product
specification, as appropriate for the grade being supplied. specification requirements for the characteristic in question, the

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 A 960/A 960M 07
TABLE 2 Product Analysis Tolerances for Higher Alloy and 9.4.1 If the results of the tension test do not conform to the
Stainless SteelsA requirements specified in the product specification, retests are
Tolerances Over the permitted as outlined in Test Methods and Definitions A 370. If
Upper Limit of
Maximum (Upper Limit) or
Element Maximum of
Under the Minimum
the results of any tension test specimen are less than specified
Specified Range, %
(Lower Limit) because a flaw becomes evident in the test specimen during
Carbon to 0.010, incl 0.002 testing, a retest shall be allowed provided that the defect is not
over 0.010 to 0.030, incl 0.005 attributable to ruptures, cracks, or flakes in the steel.
over 0.030 to 0.20, incl 0.01
over 0.20 to 0.80, incl 0.02
9.4.2 If the average impact energy value meets the product
over 0.80 to 1.20, incl 0.03 specification requirements, but one energy value is below the
Manganese to 1.00, incl 0.03 specified minimum value for individual specimens, a retest is
over 1.00 to 3.00, incl 0.04
over 3.00 to 6.00, incl 0.05
permitted. The retest shall be conducted in accordance with
over 6.00 to 10.00, incl 0.06 Test Methods and Definitions A 370.
over 10.00 to 15.00, incl 0.10 9.5 For the purpose of determining conformance to the
over 15.00 to 20.00, incl 0.15
Phosphorus to 0.040, incl 0.005
product specification requirements, specimens shall be ob-
over 0.040 to 0.20, incl 0.010 tained from a finished product, or from production material that
Sulfur to 0.040, incl 0.005 is in the same condition of working and heat treatment as the
over 0.040 to 0.20, incl 0.010
over 0.20 to 0.50, incl 0.020
production material.
Silicon to 1.00, incl 0.05
over 1.00 to 3.00, incl 0.10 10. Hardness Requirements
over 3.00 to 6.00, incl 0.15
Chromium over 4.00 to 10.00, incl 0.10 10.1 The part shall conform to the hardness requirements
over 10.00 to 15.00, incl 0.15 prescribed in the product specification.
over 15.00 to 20.00, incl 0.20 10.2 Sampling for hardness testing shall conform to the
over 20.00 to 30.00, incl 0.25
Nickel to 1.00, incl 0.03 product specification.
over 1.00 to 5.00, incl 0.07
over 5.00 to 10.00, incl 0.10 11. Tensile Requirements
over 10.00 to 20.00, incl 0.15
over 20.00 to 30.00, incl 0.20 11.1 The part shall conform to the tensile property require-
over 30.00 to 40.00, incl 0.25 ments prescribed in the product specification.
over 40.00 0.30
Molybdenum over 0.20 to 0.60, incl 0.03
11.2 Sampling for tensile testing shall conform to the
over 0.60 to 2.00, incl 0.05 product specification.
over 2.00 to 7.00, incl 0.10 11.3 When the dimensions of the material to be tested will
over 7.00 to 15.00, incl 0.15
over 15.00 to 30.00, incl 0.20
permit, the tension test specimens shall be machined to the
Titanium to 1.00, incl 0.05 form and dimensions of the standard 2-in. [50-mm] gage length
over 1.00 to 3.00, incl 0.07 tension test specimens described in Test Methods and Defini-
over 3.00 0.10
Columbium to 1.50, incl 0.05
tions A 370.
Tantalum to 0.10, incl 0.02 11.3.1 In the case of small sections, which will not permit
Copper to 0.50, incl 0.03 taking the standard test specimen described in 11.3, the subsize
over 0.50 to 1.00, incl 0.05
over 1.00 to 3.00, incl 0.10
round or strip specimen shall be machined as described in Test
over 3.00 to 5.00, incl 0.15 Methods and Definitions A 370. The tension test specimen
over 5.00 to 10.00, incl 0.20 shall be as large as feasible.
Aluminum to 0.15, incl 0.005
+0.01
over 0.15 to 0.50, incl 0.05 12. Impact Requirements
over 0.50 to 2.00, incl 0.10 12.1 The part shall conform to the impact requirements
over 2.00 to 5.00, incl 0.20
over 5.00 to 10.00, incl 0.35 prescribed in the product specification.
Nitrogen to 0.02, incl 0.005 12.2 Sampling for impact testing shall conform to the
over 0.02 to 0.19, incl 0.01 product specification.
over 0.19 to 0.25, incl 0.02
over 0.25 to 0.35, incl 0.03
over 0.35 to 0.45, incl 0.04 13. Hydrostatic Test Requirements
over 0.45 0.05
Vanadium to 0.50, incl 0.03
13.1 Parts manufactured under this specification shall be
over 0.50 to 1.50, incl 0.05 capable of passing a hydrostatic test compatible with the rating
Cerium to 0.20, incl 0.01 of the specified matching pipe of equivalent material. Such a
Tungsten to 0.50, incl 0.20
over 0.501.00, incl 0.30
test shall be conducted only when specified in the purchase
over 1.002.00, incl 0.50 order or when the hydrostatic test Supplementary Requirement
over 2.004.00, incl 0.60 is invoked by the purchaser.
A
Chrome content 4.00 or greater.
14. Rework
lot represented by that specimen shall be rejected or reworked 14.1 When one or more representative test specimens or
in accordance with Section 14. retest specimens do not conform to the requirements specified

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 A 960/A 960M 07
in the product specification for the tested characteristic, the lot 16. Repair by Welding
of material represented by the test specimen may be reworked 16.1 The purchaser may require the supplier to submit
according to the following requirements. proposed weld repairs for approval by invoking the appropriate
14.1.1 If previously tested in the untreated condition, the Supplementary Requirement in the purchase order.
product may be reworked by heat treatment, and subsequently 16.2 If the purchaser does not require prior approval of the
retested, in accordance with the product specification. proposed weld repairs, these repairs shall be permitted at the
14.1.2 If previously tested in the heat treated condition, the discretion of the supplier. All weld repairs shall be performed
product may be reworked by reheat treatment, and subse- in accordance with the following limitations and requirements.
quently retested, in accordance with the product specification. 16.2.1 The welding procedure, welders and operators shall
be qualified in accordance with Section IX of the ASME Boiler
15. Finish and Appearance and Pressure Vessel Code. The composition of the weld deposit
shall be compatible with the composition of the material being
15.1 The parts shall conform to the dimensions, tolerances welded.
and finish as specified in the purchasers order. Parts ordered to 16.2.2 Defects shall be completely removed prior to weld-
the requirements of an ASTM specification shall conform to ing by machining, chipping or grinding to sound metal.
the requirements of the individual product specification. Removal of these defects shall be verified by magnetic particle
15.2 The surface finish shall allow the detection of imper- examination in accordance with Guide E 709 or liquid pen-
fections that can be disclosed by visual inspection. Where etrant inspection in accordance with Test Method E 165, as
necessary the finished parts shall be cleaned to remove all loose applicable.
scale and processing compounds prior to the final surface 16.2.3 After repair welding, the welded area shall be ma-
examination. The cleaning process shall not injure the surface chined or ground smooth to the original contour and shall be
finish, material properties, or the metallurgical structure. The completely free of defects as verified by magnetic particle
cleaned parts shall be protected to prevent recontamination. examination in accordance with Guide E 709 or liquid pen-
Protective coatings on parts subsequently subjected to socket etrant inspection in accordance with Test Method E 165, as
welds or butt welds shall be suitable for welding without applicable.
removal of the coating. When specified in the purchase order, 16.2.4 Repair welding shall not exceed 10 % of the external
parts may be furnished in the as-formed condition. surface area of the part, or 3313 % of the wall thickness of the
15.3 Fittings supplied under this specification shall be finished product, or 38 in. [10 mm] deep maximum at the
examined visually. Selected typical surface discontinuities location of the repair, without prior approval of the purchaser.
shall be explored for depth. Unless otherwise specified in the 16.2.5 Weld repaired material or parts, or both, shall be
purchase order, the following shall apply. marked RW when required by the product specification.
16.3 The weld repair shall conform to the additional re-
15.3.1 Fittings conforming to ASME B16.9 and MSS-SP-43 quirements, if any, invoked in the product specification.
shall be free of surface discontinuities that penetrate more than
5 % of the specified nominal wall thickness, except as defined 17. Inspection
in 15.3.3 and 15.3.4. Fittings conforming to ASME B16.11 and
17.1 The supplier shall provide the purchasers inspector
MSS-SP-79 shall be free of surface discontinuities that pen-
with all reasonable facilities necessary to satisfy him that the
etrate more than 5 % of the actual wall thickness at the point of
material is being produced and furnished in accordance with
interest, or 116 in. [1.6 mm], whichever is less, except as
this specification and the applicable product specification. Site
defined in 15.3.4.
inspection by the purchaser shall not interfere unnecessarily
15.3.2 Surface discontinuities deeper than 5 % of the speci- with the suppliers operations.
fied nominal wall thickness, except as defined in 15.3.3 and
15.3.4, shall be removed by the manufacturer by machining or 18. Rejection and Rehearing
grinding to sound metal, and the repaired areas shall blend
18.1 Samples representing material rejected by the pur-
smoothly into the contour of the finished fitting. Except for chaser shall be preserved until disposition of the claim has been
fittings conforming to MSS-SP-75, the wall thickness at all agreed to between the supplier and the purchaser.
points shall be at least the specified minimum wall thickness,
or 8712 % of the specified nominal wall thickness and the 19. Marking
diameters shall be within the limits specified in the applicable
dimensional standards. 19.1 Each piece shall be legibly marked with the specifica-
tion designation, grade and class, certifying organizations
15.3.3 Surface checks (fish scale) deeper than 164 in. [0.4 name or symbol, the heat number or heat identification, size,
mm] shall be removed. and schedule or thickness, if applicable. It is not required to
15.3.4 Mechanical marks deeper than 116 in. [1.6 mm] shall mark the product with the specification year and date of issue.
be removed. The Standard Marking System of Valves, Fittings, Flanges and
15.3.5 When the removal of a surface discontinuity reduces Unions (MSS-SP-25) of the Manufacturers Standardization
the wall thickness below the specified minimum wall thickness Society of the Valve and Fittings Industry may be followed
at any point, the fitting shall be subject to rejection or to repair except the word steel shall not be substituted for the
as provided in Section 16. specification designation.

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 A 960/A 960M 07
19.2 Product marking shall conform to the additional re- 20.4 Not withstanding the absence of a signature, the
quirements, if any, invoked in the product specification. organization submitting either a printed certificate or an EDI
transmitted certificate is responsible for the content of the
20. Certification report.
20.1 Application of the specification designation and other
identification marks as required in Section 19 shall be the 21. Packaging, Marking and Loading for Shipment
certification that the material or parts, or both, have been
21.1 Packaging, marking, and loading for shipment shall be
furnished in accordance with the requirements of the specifi-
in accordance with Practices A 700.
cation.
20.2 When test reports are required, they shall include the 21.2 When specified in the contract or order, and or direct
year/date of issue, and shall be traceable to the part repre- procurement by or direct shipment to the government, when
sented. In addition, the certification shall include the results of Level A is specified, preservation, packaging, and packing shall
all tests required by this specification, the product specification, be in accordance with Level A requirements of MIL-STD-163.
and the purchase order. The manufacturer, and any subsequent
suppliers, shall provide the specific information required by the 22. Keywords
product specification and the purchase order. 22.1 austenitic stainless steel; corrosive service applica-
20.3 A certificate printed from or used in electronic data tions; ferritic/austenitic stainless steel; ferritic stainless steel;
interchange (EDI) transmission shall be regarded as having the high strength low alloy steel; martensitic stainless steel; piping
same validity as a counterpart printed in the certifiers facility. applications; pressure containing parts; pressure vessel service;
The content of the EDI transmitted document shall conform to stainless steel fittings; temperature service applications-
any existing EDI agreement between the purchaser and the elevated; temperature service applications-low; temperature
supplier. service applications-moderate

SUPPLEMENTARY REQUIREMENTS

These requirements shall not be considered unless specified in the order, in which event, the
supplementary requirements specified shall be made at the place of manufacture, unless otherwise
agreed upon, at the purchasers expense. The test specified shall be witnessed by the purchasers
inspector before shipment of material, if so specified in the order. The rationale for beginning the
section numbering with S50 is to eliminate the possibility of confusion with supplementary
requirements existing in individual product specifications.

S50. Product Analysis (See Note S50.1) each of which shall conform to the requirements specified.
S50.1 A product analysis shall be made from each heat of NOTE S50.2Where the test specimen for the tension or intergranular
corrosion bend test cannot be taken from a fitting due to size limitations,
base metal and, if of welded construction, from each lot a representative test piece shall be obtained. The test piece shall be from
number of welding material of the fittings offered for delivery. the same lot it represents and shall have approximately the same amount
The analysis shall conform to the requirements specified in of working. In addition, these pieces representing fittings manufactured
Section 8. from bars, plate, or forgings shall have a cross section equal to the greatest
cross section of the fitting, and test pieces representing fittings manufac-
S51. Tension Test (See Note S50.1) tured from pipe shall have an outside diameter and wall thickness equal to
S51.1 One tension test shall be made on one fitting or those of the fitting. The test piece for fittings of welded construction shall
be prepared to the same weld procedures and from the same heat of
representative test piece (See Note S50.2) per lot (See Note materials as the fittings it represents.
S50.3) of fittings. If the fittings are of welded construction, the
NOTE S50.3A lot shall consist of all fittings of the same type, size,
tension specimen shall include the weld and shall be prepared and wall thickness, manufactured from one heat of material (and, if
so that the weld is at the midlength location of the specimen. fabrication welding is performed using one lot number of electrode or one
However, in no case shall the tensile properties of the finished heat of weld wire), and heat treated using the same heat-treat cycle in
fitting be less than the requirements listed in the individual either a continuous or batch-tvpe furnace controlling within a range of 50
product specification. F [28 C] and equipped with recording pyrometers so that complete
records of heat treatment are available.
NOTE S50.1If the result of any of the tests specified in Supplementary
Requirements S50, S51, or S63 do not conform to requirements, retests S52. Liquid Penetrant Examination
may be made at the manufacturers expense on additional fittings or
representative test pieces of double the original number from the same S52.1 All surfaces shall be liquid penetrant examined in
heat or lot as defined in Supplementary Requirements S50, S51, or S63, accordance with Test Method E 165. Acceptance limits shall be

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 A 960/A 960M 07
specified by the purchaser. Personnel performing the examina- with Practice A 388/A 388M. Acceptance limits shall be speci-
tion shall be qualified in accordance with SNT-TC-1A-1988 or fied by the purchaser. Personnel performing NDE examinations
later. shall be qualified in accordance with SNT-TC-1A-1988 or
later.
S53. Magnetic-Particle Examination S62.2 Each fitting or the raw material from which each
S53.1 All accessible surfaces shall be magnetic particle fitting is made shall be ultrasonically tested to determine its
examined in accordance with Guide E 709. Acceptance limits soundness. The method, where applicable, shall be in accor-
shall be specified by the purchaser. Personnel performing the dance with Practice E 213. Acceptable limits shall be specified
examination shall be qualified in accordance with SNT-TC-1A- by the purchaser. Personnel performing the examination shall
1988 or later. be qualified in accordance with SNT-TC-1A-1988 or later.
S54. Hydrostatic Test S63. Intergranular Corrosion Bend Test (See Note S50.1)
S54.1 A hydrostatic test shall be applied as agreed upon S63.1 An intergranular corrosion bend test shall be made on
between the manufacturer and purchaser. one fitting or representative test piece (See Note S50.2) per lot
(See Note S50.3) of fittings. If the fittings are of welded
S55. Bar Stock Fittings construction, the bend specimen shall include the weld and be
S55.1 Bar stock fittings shall not be permitted. prepared so that the weld is at the midlength location of the
specimen. Specimens containing a weld shall be bent so that
S56. Special Heat Treatment the location of weld is at the point of maximum bend. The
S56.1 A special heat treatment shall be applied as agreed method of testing shall be in accordance with Practices A 262
upon between the manufacturer and the purchaser. or Practices A 763, as applicable.
S57. Hardness Test S64. Photomicrographs
S57.1 If actual hardness testing of fittings is required, the S64.1 Photomicrographs at 100 diameters shall be made for
frequency and the method used shall be as agreed upon information only of the actual base metal structure from one
between the manufacturer and the purchaser. fitting as furnished in each lot. The photomicrographs shall be
identified as to fitting size, wall thickness, lot identification,
S58. Special Fittings and heat. The definition of lot shall be as specified by the
S58.1 Partial compliance fittings of size or shape not con- purchaser.
forming to the dimensional requirements of ASME B16.9,
B16.11, MSS-SP-79, and MSS-SP-95 shall meet all other S65. Surface Finish
requirements of the individual product specification. In addi- S65.1 Machined surfaces shall have a maximum roughness
tion to the marking required by Section 19, the grade designa- of 250 in. AARH [6.3 m]. All other surfaces shall be suitable
tion symbol of the individual product specification shall be for ultrasonic testing.
followed by the symbol S58.
S66. Repair Welding
S59. Heat Treatment of Concentric Reducers S66.1 No weld repair shall be permitted without prior
S59.1 Concentric reducers formed by local heating of the approval of the purchaser.
fitting shall be subsequently annealed, normalized, or normal-
ized and tempered. S67. Charpy V-Notch Test
S67.1 Charpy V-notch test shall be made as specified on the
S60. Marking Small Fittings order. The test temperature, acceptance criteria, number of
S60.1 For small products where the space for marking is tests, and location of tests (whether from base metal, weld
less than 1 in. [25 mm] in any direction, test reports are metal, or heat affected zone of welds) shall be specified.
mandatory and marking may be restricted to only such symbols
or codes as are necessary to identify the parts with test reports. S68. Special Notch Toughness
S60.2 When the configuration or size does not permit S68.1 The impact test temperature or acceptance values, or
marking directly on the fitting, the marking method shall be a both, shall be as agreed upon, but only with respect to lower
matter of agreement between the manufacturer and the pur- temperatures or higher energy values.
chaser.
S69. Magnetic Particle ExaminationWeld Metal
S61. Phosphorous and Sulphur Content S69.1 All accessible welds shall be examined in accordance
S61.1 The phosphorous and sulphur contents of the fittings with Guide E 709. Accessible is defined as all outside surfaces,
shall not exceed 0.025 %. all inside fitting surfaces 24 in. [610 mm] in diameter and
greater, and inside fitting surfaces less than 24 in. [610 mm] in
S62. Ultrasonic Test diameter, for a distance of one diameter from the ends.
S62.1 Each fitting or the raw material from which the fitting S69.2 Acceptance CriteriaThe following indications are
is made shall be ultrasonically tested to determine its sound- unacceptable:
ness. The method, where applicable, shall be in accordance S69.2.1 Any cracks and linear indications,

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 A 960/A 960M 07
S69.2.2 Rounded indications with dimensions greater than S75. Chemical Analysis of Remelted Steel

3 16 in. [4.8 mm], S75.1 Each remelted ingot shall be assigned a unique
S69.2.3 Four or more indications in any line separated by identification number.
116 in. [1.6 mm],
S75.2 A chemical analysis shall be made from each re-
S69.2.4 Ten or more indications located in any 6 in.2[4000 melted ingot.
mm2] of surface, with the major dimensions not to exceed 6 in.
[150 mm] when the major dimension is oriented so that the S76. Electropolished Austenitic Grades
area includes the maximum number of indications being
evaluated. S76.1 All electropolished austenitic fittings shall be of a
S69.3 Personnel performing NDE examinations shall be cleanliness according to Specification A 967.
qualified in accordance with SNT-TC-1A-1988 or later. S76.2 Details concerning which test method of Specifica-
tion A 967 are to be a matter of agreement between the
S70. Liquid Penetrant Examination of Weld Metal manufacturer and the purchaser.
S70.1 All accessible surfaces of fittings shall be examined
S77. Positive Material Identification Examination
in accordance with Test Method E 165. Accessible is defined in
S69. S77.1 Fittings shall be examined to assure that the pur-
S70.2 Acceptance criteria shall be in accordance with chaser is receiving fittings of the correct material grade prior to
S69.2. shipment of the fittings. This examination is to assure that no
S70.3 Personnel performing NDE examinations shall be material grade mix-up has happened during manufacturing and
qualified in accordance with SNT-TC-1A-1988 or later. marking of the fittings.
S77.2 Fittings shall receive a Positive Material Identifica-
S71. Product Marking tion examination using the methods of Guide E 1916.
S71.1 Weld repaired parts shall be marked S71. S77.3 The quantity examined shall be 100 % of the fittings.
S77.4 All fittings that are not of the correct material grade
S72. Nondestructive Electromagnetic (Eddy-Current) Test shall be rejected.
S77.5 The method of fitting marking after this examination
S72.1 For eddy-current testing, the calibration tube shall
shall be agreed upon between the manufacturer and purchaser.
contain, at the option of the manufacturer, any one of the
following discontinuities placed in the weld to establish a
S78. Requirements for Carbon Steel Products for
minimum sensitivity level for rejection.
Concentrated Hydrofluoric Acid Service
S72.2 Drilled HoleA hole not larger than 0.031 in. [0.79
mm] in diameter shall be drilled radially and completely S78.1 Products shall be provided in the normalized heat-
through the tube wall, with care being taken to avoid distortion treated condition.
of the tube while drilling. S78.2 The maximum carbon equivalent based on heat
S72.3 Transverse Tangential NotchUsing a round tool or analysis shall be as follows:
file with a 14-in. [6-mm] diameter, a notch shall be filed or Maximum section thickness less than or equal to 1 in. CE maximum = 0.43
milled tangential to the surface and transverse to the longitu- Maximum section thickness greater than 1 in. CE maximum = 0.45
dinal axis of the tube. The notch shall have a depth not S78.3 Determine the carbon equivalent (CE) as follows:
exceeding 1212 % of the specified wall thickness of the tube or CE = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15
0.004 in. [0.102 mm], whichever is greater. S78.4 Vanadium and Niobium maximum content based on
S72.4 Longitudinal NotchA notch 0.031 in. [0.79 mm] or heat analysis shall be:
less in width shall be machined in a radial plane parallel to the Maximum Vanadium = 0.02 wt %
tube axis on the outside surface of the tube, to have a depth not Maximum Niobium = 0.02 wt %
exceeding 1212 % of the specified wall thickness of the tube or Maximum Vanadium plus Niobium = 0.03 wt %
0.004 in. [0.102 mm], whichever is greater. The length of the (Note Niobium = Columbium)
notch shall be compatible with the testing method.
S78.5 The maximum composition based on heat analysis of
S72.5 Fittings producing a signal equal to or greater than the
Ni + Cu shall be 0.15 wt %.
calibration defect shall be subject to rejection. To be accepted,
S78.6 The minimum C content based on heat analysis shall
after rework, the fittings must pass the same test to which it
be 0.18 wt %. The maximum C content shall be as specified in
was originally subjected.
the appropriate material specification.
S72.6 Personnel performing NDE examinations shall be
qualified in accordance with SNT-TC-1A-1988 or later. S78.7 Repair welds shall not be made with E60XX elec-
trodes. Use of E70XX electrodes is recommended and the
resulting weld chemistry should meet the same chemistry
S73. Weld Metal Analysis
criteria as the base metal as listed above.
S73.1 Analysis of weld metal shall be reported. S78.8 In addition to the requirements of product marking of
the specification, an 9HF-N9 stamp or marking shall be pro-
S74. Welding Procedure Test Record vided on each component to identify that component complies
S74.1 A welding procedure test record shall be furnished. with this supplementary requirement.

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 A 960/A 960M 07
S79 Pressure Equipment DirectiveMechanical Testing S79.3 The minimum impact absorption energy for the
S79.1 Charpy impact testing shall be done at the lowest Charpy test specimen shall be at least 20 ft-lb [27 J].
scheduled operating temperature, but not higher than 68 F [20 S79.4 The minimum elongation in the tension test shall be
C]. measured on a gage length of five times the diameter of the test
S79.2 The frequency of impact testing shall be the same as specimen, and shall not be less than 14 %.
that specified in the product specification for the tension test, S79.5 Impact and tension test results shall be included in the
with three individual Charpy test specimens for each required product certification.
tension test.

ANNEX

(Mandatory Information)

A1. Requirements for the Introduction of New Materials

A1.1 New materials may be proposed for inclusion in A1.1.3 The application shall be accompanied by test data as
specifications referencing this specification of general require- required by the applicable specification. Test data from a
ments subject to the following conditions: minimum of three test lots, as defined by the specification, each
A1.1.1 Application for the addition of a new grade to a from a different heat, shall be furnished.
specification shall be made to the chairman of the subcommit- A1.1.4 The application shall provide recommendations for
tee, which has jurisdiction over that specification. all requirements appearing in the applicable specification.
A1.1.2 The application shall be accompanied by a statement A1.1.5 The application shall state whether the new grade is
from at least one user indicating that there is a need for the new covered by patent.
grade to be included in the applicable specification.

SUMMARY OF CHANGES

Committee A01 has identified the location of selected changes to this specification since the last issue,
A 960/A 960M 06, that may impact the use of this specification. (Approved February 1, 2007)

(1) Deleted the term ASTM in 19.1 and 20.1.

Committee A01 has identified the location of selected changes to this specification since the last issue,
A 960/A 960M 04a, that may impact the use of this specification. (Approved March 1, 2006)

(1) Added new paragraph 8.2.1 on grade substitution.

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