ASTM A790/A790M-24

Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe

ABSTRACT
The specification covers seamless and straight-seam welded ferritic/austenitic steel pipe for general corrosive service, with particular emphasis on resistance to stress corrosion cracking. The pipe shall be made by the seamless or an automatic welding process, with no addition of filler metal in the welding operation. Heat analysis shall be made to determine the percentages of the elements specified. Tension tests, hardening tests, flattening tests, hydrostatic tests and nondestructive electric tests shall be made to conform to the specified requirements.
SCOPE
1.1 This specification2 covers seamless and straight-seam welded ferritic/austenitic steel pipe intended for general corrosive service, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.  
1.2 Optional supplementary requirements are provided for pipe when a greater degree of testing is desired. These supplementary requirements call for additional tests to be made and, when desired, one or more of these may be specified in the order.  
1.3 Appendix X1 of this specification lists the dimensions of welded and seamless stainless steel pipe as shown in ANSI B36.19. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification.  
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. The inch-pound units shall apply unless the M designation of this specification is specified in the order.  
Note 1: The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as nominal diameter, size, and nominal size.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 29-Feb-2024
• ICS: 23.040.10 - Iron and steel pipes
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.10 - Stainless and Alloy Steel Tubular Products

Relations

• Replaces: ASTM A790/A790M-23 - Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
• Effective Date: 01-Mar-2024
• Refers: ASTM A941-24 - Standard Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
• Effective Date: 01-Mar-2024
• Refers: ASTM A370-24 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 01-Mar-2024
• Refers: ASTM A370-23 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 15-Sep-2023
• Refers: ASTM A941-23 - Standard Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
• Effective Date: 01-May-2023
• Referred By: ASTM A554-21 - Standard Specification for Welded Stainless Steel Mechanical Tubing
• Effective Date: 01-Mar-2024
• Referred By: ASTM A999/A999M-23 - Standard Specification for General Requirements for Alloy and Stainless Steel Pipe
• Effective Date: 01-Mar-2024

Overview

ASTM A790/A790M-24 is an internationally recognized standard specification developed by ASTM for seamless and straight-seam welded ferritic/austenitic (duplex) stainless steel pipe. The standard covers pipes intended for general corrosive service, with a particular focus on enhanced resistance to stress corrosion cracking. Materials manufactured to this specification are used in industries where mechanical strength and corrosion resistance are paramount, such as chemical processing, oil and gas, water treatment, and marine environments.

The standard details requirements for manufacturing, testing, heat treatment, chemical composition, and mechanical properties. It ensures product reliability and performance in demanding conditions, with optional supplementary requirements for enhanced quality control.

Key Topics

• Scope of Application: Covers seamless and straight-seam welded duplex stainless steel pipe for corrosive services, emphasizing resistance to stress corrosion cracking.
• Manufacturing Processes: Pipes must be produced using either a seamless method or an automatic welding process without the addition of filler metal. Both hot-finished and cold-finished pipes are permitted at the manufacturer's discretion.
• Heat Treatment: All pipes must undergo heat treatment, per specified temperatures and cooling methods, to ensure uniform properties. Some welded pipes may be furnished without additional heat treatment under certain conditions.
• Chemical and Mechanical Requirements: Strict controls on chemical composition and mechanical properties, including yield and tensile strength, elongation, and hardness, are specified to ensure consistency and performance.
• Testing Requirements: The standard requires a range of tests, such as tension, hardness, flattening, hydrostatic, and nondestructive electric tests, to verify pipe integrity.
• Dimensional Standards: Pipe dimensions are referenced in ANSI B36.19, and both SI and inch-pound units are acceptable, but values from the two systems must not be combined.
• Product Marking: Pipes must be marked with the manufacturer’s identification, seamless or welded process, and other relevant details for traceability.

Applications

ASTM A790/A790M-24 duplex stainless steel pipes are widely used in:

• Chemical and Petrochemical Plants: For handling corrosive chemicals and aggressive environments.
• Oil and Gas Industry: Used in pipelines, offshore platforms, and processing facilities where resistance to corrosion and stress cracking is critical.
• Water Treatment and Desalination: Suitable for seawater and brine environments due to high corrosion resistance.
• Pulp and Paper Industry: Used in bleach plants and recovery cycles where both mechanical strength and corrosion resistance are needed.
• Marine Engineering: Well-suited for shipbuilding, seawater cooling lines, and other marine applications.

The specification is ideal for projects where long-term durability and resistance to various forms of corrosion, including pitting and crevice corrosion, are crucial.

Related Standards

Professionals working with ASTM A790/A790M-24 may also reference or require compliance with the following standards:

• ASTM A999/A999M: General requirements for alloy and stainless steel pipe.
• ANSI B36.19: Stainless steel pipe dimensions.
• ASTM A370: Mechanical testing of steel products.
• ASTM A923: Detection of detrimental intermetallic phases in duplex stainless steels.
• ASME Boiler and Pressure Vessel Code applications via related Specification SA-790.
• AWS A5.9: Specifications for corrosion-resisting welding rods and electrodes.
• ASTM E213, E309, E426: Practices for ultrasonic and eddy current nondestructive testing.
• SNT-TC-1A: Personnel qualification for nondestructive testing.

Practical Value

ASTM A790/A790M-24 assures buyers and end-users that ferritic/austenitic stainless steel pipe meets rigorous quality and safety standards. By following this standard, organizations can improve product reliability, facilitate international trade, and adhere to best practices in material procurement and installed systems. The detailed requirements for testing, marking, and documentation provide a consistent, transparent basis for both compliance and inspection processes.

Keywords: ASTM A790, duplex stainless steel pipe, ferritic/austenitic pipe, seamless steel pipe, welded stainless steel pipe, corrosion resistance, stress corrosion cracking, industrial piping standards.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: A790/A790M − 24
Standard Specification for
Seamless and Welded Ferritic/Austenitic Stainless Steel
Pipe
This standard is issued under the fixed designation A790/A790M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
1.1 This specification covers seamless and straight-seam
2.1 ASTM Standards:
welded ferritic/austenitic steel pipe intended for general corro-
A370 Test Methods and Definitions for Mechanical Testing
sive service, with particular emphasis on resistance to stress
of Steel Products
corrosion cracking. These steels are susceptible to embrittle-
A923 Test Methods for Detecting Detrimental Intermetallic
ment if used for prolonged periods at elevated temperatures.
Phase in Duplex Austenitic/Ferritic Stainless Steels
1.2 Optional supplementary requirements are provided for A941 Terminology Relating to Steel, Stainless Steel, Related
pipe when a greater degree of testing is desired. These Alloys, and Ferroalloys
supplementary requirements call for additional tests to be made A999/A999M Specification for General Requirements for
and, when desired, one or more of these may be specified in the
Alloy and Stainless Steel Pipe
order.
E213 Practice for Ultrasonic Testing of Metal Pipe and
Tubing
1.3 Appendix X1 of this specification lists the dimensions of
E309 Practice for Eddy Current Examination of Steel Tubu-
welded and seamless stainless steel pipe as shown in ANSI
lar Products Using Magnetic Saturation
B36.19. Pipe having other dimensions may be furnished
E381 Method of Macroetch Testing Steel Bars, Billets,
provided such pipe complies with all other requirements of this
Blooms, and Forgings
specification.
E426 Practice for Electromagnetic (Eddy Current) Examina-
1.4 The values stated in either SI units or inch-pound units
tion of Seamless and Welded Tubular Products, Titanium,
are to be regarded separately as standard. Within the text, the
Austenitic Stainless Steel and Similar Alloys
SI units are shown in brackets. The values stated in each
E527 Practice for Numbering Metals and Alloys in the
system may not be exact equivalents; therefore, each system
Unified Numbering System (UNS)
shall be used independently of the other. Combining values
from the two systems may result in non-conformance with the
2.2 ANSI Standards:
standard. The inch-pound units shall apply unless the M
B1.20.1 Pipe Threads, General Purpose
designation of this specification is specified in the order.
B36.10 Welded and Seamless Wrought Steel Pipe
B36.19 Stainless Steel Pipe
NOTE 1—The dimensionless designator NPS (nominal pipe size) has
been substituted in this standard for such traditional terms as nominal 5
2.3 SAE Standard:
diameter, size, and nominal size.
SAE J 1086
1.5 This international standard was developed in accor-
2.4 Other Standard:
dance with internationally recognized principles on standard-
SNT-TC-1A Personal Qualification and Certification in
ization established in the Decision on Principles for the
Nondestructive Testing
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Standards volume information, refer to the standard’s Document Summary page on
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee the ASTM website.
A01.10 on Stainless and Alloy Steel Tubular Products. Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
Current edition approved March 1, 2024. Published March 2024. Originally 4th Floor, New York, NY 10036, http://www.ansi.org.
approved in 1981. Last previous edition approved in 2023 as A790/A790M – 23. Available from Society of Automotive Engineers (SAE), 400 Commonwealth
DOI: 10.1520/A0790_A0790M-24. Dr., Warrendale, PA 15096-0001, http://www.sae.org.
2 6
For ASME Boiler and Pressure Vessel Code applications see related Specifi- Available from American Society for Nondestructive Testing (ASNT), P.O. Box
cation SA–790 in Section II of that Code. 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
*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
A790/A790M − 24
TABLE 1 Heat Treatment
UNS
A
Type Temperature °F [°C] Quench
Designation
S31200 1920–2010 Rapid cooling in water
[1050–1100]
S31260 1870–2010 Rapid cooling in water or by
[1020–1100] other means
S31500 1800–1900 Rapid cooling in water or by
[980–1040] other means
S31803 1870–2010 Rapid cooling in water or by
[1020–1100] other means
S32003 1850–2050 Rapid cooling in water or by
[1010–1120] other means
S32101 1870 [1020] Rapid cooling in water or by
other means
S32202 1870–1975 Rapid cooling in water or by
[1020–1080] other means
S32205 2205 1870–2010 Rapid cooling in water or by
[1020–1100] other means
S32304 2304 1700–1920 Rapid cooling in water or by
[925–1050] other means
S32506 1870–2050 Rapid cooling in water or by
[1020–1120] other means
S32520 1975–2050 Rapid cooling in water or by
[1080–1120] other means
S32550 255 1900 [1040] min Rapid cooling in water or by
other means
S32707 1975–2050 Rapid cooling in water or by
[1080–1120] other means
S32750 2507 1880–2060 Rapid cooling in water or by
[1025–1125] other means
S32760 1960–2085 Rapid cooling in water or by
[1070–1140] other means
S32808 1920–2100 Rapid cooling in water or by
[1050–1150] other means
S32900 329 1700–1750 Rapid cooling in water or by
[925–955] other means
S32906 1870–2100 Rapid cooling in water or by
[1020–1150] other means
S32950 1820–1880 Air cool
[990–1025]
S33207 1905–2085 Rapid cooling in water or by
[1040–1140] other means
S39274 1920–2060 Rapid cooling in water or by
[1050–1125] other means
S39277 1975–2155 Rapid cooling in water or by
[1080–1180] other means
S81921 1760–2010 Rapid cooling in water or by
[960–1100] other means
S82011 1850–2050 Rapid cooling in water or by
[1010–1120] other means
S82121 1830–2010 Rapid cooling in water or by
[1000–1100] other means
S82441 1870 [1020] Rapid cooling in water or by
other means
S83071 . . . 1830–2100 Rapid cooling in water or by
[1000–1150] other means
S83072 . . . 1830–2100 Rapid cooling in water or by
[1000–1150] other means
A
Common name, not a trademark, widely used, not associated with any one
producer. 329 is an AISI number.
2.5 AWS Standard: 4. Ordering Information
A5.9 Corrosion-Resisting Chromium and Chromium-Nickel
4.1 Orders for material under this specification should
Steel Welding Rods and Electrodes
include the following, as required, to describe the desired
material adequately:
3. Terminology
4.1.1 Quantity (feet, [metres], or number of lengths),
3.1 Definitions—For definitions of terms used in this speci-
4.1.2 Name of material (ferritic/austenitic steel pipe),
fication refer to Terminology A941.
4.1.3 Process (seamless or welded),
4.1.4 Grade (see Table 1),
4.1.5 Size (NPS designator or outside diameter and sched-
Available from American Welding Society (AWS), 550 NW LeJeune Rd.,
Miami, FL 33126, http://www.aws.org. ule number of average wall thickness),
A790/A790M − 24
4.1.6 Length (specific or random) (see Section 11), 8. Heat Analysis
4.1.7 End finish (section on ends of Specification A999/
8.1 An analysis of each heat of steel shall be made by the
A999M),
steel manufacturer to determine the percentages of the ele-
4.1.8 Optional requirements (product analysis, Section 9;
ments specified.
hydrostatic test or nondestructive electric test, Section 14),
9. Product Analysis
4.1.9 Test report required (section on certification of Speci-
fication A999/A999M),
9.1 At the request of the purchaser’s inspector, an analysis
4.1.10 Specification designation, and
of one billet or one length of flat-rolled stock from each heat,
4.1.11 Special requirements and any supplementary require-
or two pipes from each lot, shall be made by the manufacturer.
ments selected.
A lot of pipe shall consist of the following number of lengths
of the same size and wall thickness from any one heat of steel:
5. General Requirements
NPS Designator Lengths of Pipe in Lot
5.1 Material furnished under this specification shall con-
Under 2 400 or fraction thereof
form to the applicable requirements of the current edition of
2 to 5, incl 200 or fraction thereof
6 and over 100 or fraction thereof
Specification A999/A999M unless otherwise provided herein.
9.2 The results of these analyses shall be reported to the
purchaser or the purchaser’s representative and shall conform
6. Materials and Manufacture
to the requirements specified in Section 7.
6.1 Manufacture:
9.3 If the analysis of one of the tests specified in 8.1 or 9.1
6.1.1 The pipe shall be made by the seamless or an
does not conform to the requirements specified in Section 7, an
automatic welding process, with no addition of filler metal in
analysis of each billet or pipe from the same heat or lot may be
the welding operation.
made, and all billets or pipe conforming to the requirements
6.1.2 At the manufacturer’s option, pipe may be either
shall be accepted.
hot-finished or cold-finished.
6.1.3 The pipe shall be pickled free of scale. When bright
10. Tensile and Hardness Properties
annealing is used, pickling is not necessary.
10.1 The material shall conform to the tensile and hardness
6.2 Discard—A sufficient discard shall be made from each
properties prescribed in Table 3.
ingot to secure freedom from injurious piping and undue
segregation.
11. Lengths
6.3 Unless otherwise stated in the order, all pipe shall be
11.1 Pipe lengths shall be in accordance with the following
furnished in the heat-treated condition as shown in Table 1.
regular practice:
6.3.1 For seamless pipe, as an alternate to final heat treat- 11.1.1 Unless otherwise agreed upon, all sizes from NPS ⁄8
ment in a continuous furnace or batch-type furnace, immedi- to and including NPS 8 are available in a length up to 24 ft (see
ately following hot forming while the temperature of the pipes Note 3) with the permissible range of 15 to 24 ft (see Note 3).
is not less than the specified minimum solution treatment Short lengths are acceptable and the number and minimum
temperature, pipes shall be individually quenched in water or length shall be agreed upon between the manufacturer and the
rapidly cooled by other means, except for UNS S32950, which purchaser.
shall be air cooled.
NOTE 3—This value applies when the inch-pound designation of this
6.3.2 If the purchaser desires pipe without heat treatment
specification is the basis of purchase. When the M designation of this
subsequent to welding, the purchase order shall specify the specification is the basis of purchase, the corresponding metric value(s)
shall be agreed upon between the manufacturer and purchaser.
following condition:
6.3.2.1 No final heat treatment of pipe fabricated from plate 11.1.2 If definite cut lengths are desired, the lengths re-
that has been heat treated as required by Table 1 for the quired shall be specified in the order. No pipe shall be less than
particular grade is required, provided a sample of that heat of the specified length and no more than ⁄4 in. [6 mm] over it.
finished pipe or material representative of that heat of pipe as 11.1.3 No jointers are permitted unless otherwise specified.
a prolongation of the weld passes the Test Methods A923
12. Workmanship, Finish, and Appearance
Method B or C (See Note 2), including base metal, weld metal,
and heat affected zone per heat. Each pipe supplied under this
12.1 The finished pipes shall be reasonably straight and
requirement shall be stenciled with the suffix “HT-O.”
shall have a workmanlike finish. Imperfections may be re-
6.3.2.2 For materials not listed in Table 3 of Test Methods moved by grinding, provided the wall thicknesses are not
A923, the HT-O provision does not apply.
decreased to less than that permitted, in the Permissible
NOTE 2—The Test Methods A923 test method (B or C) is at the
Variations in Wall Thickness Section of Specification A999/
manufacturer’s option, unless otherwise specified by the purchaser.
A999M.
7. Chemical Composition
13. Mechanical Tests Required
7.1 The steel shall conform to the chemical requirements as 13.1 Transverse or Longitudinal Tension Test—One tension
prescribed in Table 2. test shall be made on a specimen for lots of not more than 100
A790/A790M − 24
A
TABLE 2 Chemical Requirements
UNS
C
Designa- Type C Mn P S Si Ni Cr Mo N Cu Others
B
tion
S31200 0.030 2.00 0.045 0.030 1.00 5.5–6.5 24.0–26.0 1.20–2.00 0.14–0.20 . . . . . .
S31260 0.030 1.00 0.030 0.030 0.75 5.5–7.5 24.0–26.0 2.5–3.5 0.10–0.30 0.20–0.80 W
0.10–
0.50
S31500 0.030 1.20–2.00 0.030 0.030 1.40–2.00 4.2–5.2 18.0–19.0 2.50–3.00 0.05–0.10 . . . . . .
S31803 0.030 2.00 0.030 0.020 1.00 4.5–6.5 21.0–23.0 2.5–3.5 0.08–0.20 . . . . . .
S32003 0.030 2.00 0.030 0.020 1.00 3.0–4.0 19.5–22.5 1.50–2.00 0.14–0.20 . . . . . .
S32101 0.040 4.0–6.0 0.040 0.030 1.00 1.35–1.70 21.0–22.0 0.10–0.80 0.20–0.25 0.10–0.80 . . .
S32202 0.030 2.00 0.040 0.010 1.00 1.00–2.80 21.5–24.0 0.45 0.18–0.26 . . . . . .
S32205 2205 0.030 2.00 0.030 0.020 1.00 4.5–6.5 22.0–23.0 3.0–3.5 0.14–0.20 . . . . . .
S32304 2304 0.030 2.50 0.040 0.040 1.00 3.0–5.5 21.5–24.5 0.05–0.60 0.05–0.20 0.05–0.60 . . .
S32506 0.030 1.00 0.040 0.015 0.90 5.5–7.2 24.0–26.0 3.0–3.5 0.08–0.20 . . . W
0.05–
0.30
S32520 0.030 1.5 0.035 0.020 0.80 5.5–8.0 24.0–26.0 3.0–5.0 0.20–0.35 0.5–3.00 . . .
S32550 255 0.04 1.50 0.040 0.030 1.00 4.5–6.5 24.0–27.0 2.9–3.9 0.10–0.25 1.50–2.50 . . .
S32707 0.030 1.50 0.035 0.010 0.50 5.5–9.5 26.0–29.0 4.0–5.0 0.30–0.50 1.0 Co
0.5–
2.0
D
S32750 2507 0.030 1.20 0.035 0.020 0.80 6.0–8.0 24.0–26.0 3.0–5.0 0.24–0.32 0.5 . . .
E
S32760 0.030 1.00 0.030 0.010 1.00 6.0–8.0 24.0–26.0 3.0–4.0 0.20–0.30 0.50–1.00 W
0.50–
1.00
S32808 0.030 1.10 0.030 0.010 0.50 7.0–8.2 27.0–27.9 0.80–1.20 0.30–0.40 . . . W
2.10–
2.50
S32900 329 0.08 1.00 0.040 0.030 0.75 2.5–5.0 23.0–28.0 1.00–2.00 . . . . . . . . .
S32906 0.030 0.80–1.50 0.030 0.030 0.80 5.8–7.5 28.0–30.0 1.50–2.60 0.30–0.40 0.80 . . .
S32950 0.030 2.00 0.035 0.010 0.60 3.5–5.2 26.0–29.0 1.00–2.50 0.15–0.35 . . . . . .
S33207 0.030 1.50 0.035 0.010 0.80 6.0–9.0 29.0–33.0 3.0–5.0 0.40–0.60 1.0
S39274 0.030 1.00 0.030 0.020 0.80 6.0–8.0 24.0–26.0 2.5–3.5 0.24–0.32 0.20–0.80 W
1.50–
2.50
S39277 0.025 0.80 0.025 0.002 0.80 6.5–8.0 24.0–26.0 3.0–4.0 0.23–0.33 1.20–2.00 W
0.8–
1.2
S81921 0.030 2.00–4.00 0.040 0.030 1.00 2.00–4.00 19.0–22.0 1.00–2.00 0.14–0.20 . . . . . .
S82011 0.030 2.0–3.0 0.040 0.020 1.00 1.00–2.00 20.5–23.5 0.10–1.00 0.15–0.27 0.50 . . .
S82121 . . . 0.035 1.00–2.50 0.040 0.010 1.00 2.00–4.00 21.0–23.0 0.30–1.30 0.15–0.25 0.20–1.20 . . .
S82441 0.030 2.5–4.0 0.035 0.005 0.70 3.0–4.5 23.0–25.0 1.00–2.00 0.20–0.30 0.10–0.80
S83071 . . . 0.030 0.50–1.50 0.030 0.020 0.50 6.0–8.0 29.0–31.0 3.0–4.0 0.28–0.40 0.80 . . .
S83072 . . . 0.030 0.50–1.50 0.030 0.030 0.30 6.0–8.0 28.5–30.5 0.7–1.7 0.35–0.45 0.5 W 3.0-4.0
A
Maximum, unless a range or minimum is indicated. Where ellipses (.) appear in this table, there is no minimum and analysis for the element need not be determined
or reported.
B
New designation established in accordance with Practice E527 and SAE J 1086.
C
Common name, not a trademark, widely used, not associated with any one producer. 329 is an AISI number.
D
% Cr + 3.3 × % Mo + 16 × % N $ 41.
E
% Cr + 3.3 × (% Mo + 0.5 %W) + 16 × % N $ 41.
pipes. Tension tests shall be made on specimens from 2 pipes 13.2.2 Where final heat treatment is obtained, consistent
for lots of more than 100 pipes. with the requirements of 6.3, in a batch-type heat-treatment
furnace equipped with recording pyrometers and automatically
13.2 Mechanical Testing Lot Definition—The term lot for
controlled within a 50 °F [30 °C] or smaller range, the lot shall
mechanical tests applies to all pipe of the same nominal size
be the larger of (a) each 200 ft [60 m] or fraction thereof or (b)
and wall thickness (or schedule) that is produced from the same
that pipe heat treated in the same batch furnace charge.
heat of steel and subjected to the same finishing treatment as
defined as follows:
13.2.3 Where the final heat treatment is obtained, consistent
13.2.1 Where the heat treated condition is obtained, consis-
with the requirements of 6.3, in a batch-type heat-treatment
tent with the requirements of 6.3, in a continuous heat
furnace not equipped with recording pyrometers and automati-
treatment furnace or by directly obtaining the heat treated
cally controlled within a 50 °F [30 °C] or smaller range, the
condition by quenching after hot forming, the lot shall include
term lot for mechanical tests applies to the pipe heat treated in
all pipe of the same size and heat, heat treated in the same
the same batch furnace charge, provided that such pipe is of the
furnace at the same temperature, time at heat, and furnace
same nominal size and wall thickness (or schedule) and is
speed or all pipe of the same size and heat, hot formed and
produced from the same heat of steel.
quenched in the same production run.
A790/A790M − 24
TABLE 3 Tensile and Hardness Requirements
Tensile Yield Elongation
Hardness, max
UNS Strength, Strength, in 2 in. or
A
Type
Designation min, ksi min, 50 mm,
HBW HRC
[MPa] ksi [MPa] min, %
S31200 100 [690] 65 [450] 25 280 . . .
S31260 100 [690] 65 [450] 25 . . . . . .
S31500 92 [630] 64 [440] 30 290 30
S31803 90 [620] 65 [450] 25 290 30
S32003
t # 100 [690] 70 [485] 25 290 30
0.187 in.
[5.00 mm]
t > 95 [655] 65 [450] 25 290 30
0.187 in.
[5.00 mm]
S32101
t # 101 [700] 77 [530] 30 290 . . .
0.187 in.
[5.00 mm]
t > 94 [650] 65 [450] 30 290 . . .
0.187 in.
[5.00 mm]
S32202 94 [650] 65 [450] 30 290 30
S32205 2205 95 [655] 65 [450] 25 290 30
S32304 2304 87 [600] 58 [400] 25 290 30
S32506 90 [620] 65 [450] 18 302 32
S32520 112 [770] 80 [550] 25 310 . . .
S32550 255 110 [760] 80 [550] 15 297 31
S32707 133 [920] 101 [700] 25 318 34
S32750 2507 116 [800] 80 [550] 15 300 32
B
S32760 109 [750] 80 [550] 25 310 32
S32808
t < 116 [800] 80 [550] 15 310 32
0.40 in.
[10 mm]
t $ 101 [700] 72 [500] 15 310 32
0.40 in.
[10 mm]
S32900 329 90 [620] 70 [485] 20 271 28
S32906
t < 116 [800] 94 [650] 25 300 32
0.40 in.
[10 mm]
t $ 109 [750] 80 [550] 25 300 32
0.40 in.
[10 mm]
S32950 100 [690] 70 [480] 20 290 30
S33207
t < 138 [950] 112 [770] 15 336 36
0.157 in.
[4 mm]
t $ 123 [850] 101 [700] 15 336 36
0.157 in.
[4 mm]
S39274 116 [800] 80 [550] 15 310 32
S39277 120 [825] 90 [620] 25 290 30
S81921 90 [620] 65 [450] 25 290 30
S82011
t < 101 [700] 75 [515] 30 293 31
0.187 in.
[5.00 mm]
t $ 95 [655] 65 [450] 30 293 31
0.187 in.
[5.00 mm]
S82121 . . . 94 [650] 65 [450] 25 286 30
S82441
t < 107 [740] 78 [540] 25 290 . . .
0.4 in.
[10 mm]
t $ 99 [680] 70 [480] 25 290 . . .
0.4 in.
[10 mm]
S83071 . . . 120 [830] 98 [680] 25 300 32
S83072 . . . 120 [830] 94 [650] 25 327 35
A
Common name, not a trademark, widely used, not associated with any one producer. 329 is an AISI number.
B
Prior to A790/A790M – 04, the tensile strength value for UNS 32760 was 109–130 ksi [750–895 MPa].
A790/A790M − 24
13.3 Flattening Test—For pipe heat treated in a batch-type 14.3.1.5 A purchaser interested in ascertaining the nature
furnace, flattening tests shall
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A790/A790M − 23 A790/A790M − 24
Standard Specification for
Seamless and Welded Ferritic/Austenitic Stainless Steel
Pipe
This standard is issued under the fixed designation A790/A790M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This specification covers seamless and straight-seam welded ferritic/austenitic steel pipe intended for general corrosive
service, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used
for prolonged periods at elevated temperatures.
1.2 Optional supplementary requirements are provided for pipe when a greater degree of testing is desired. These supplementary
requirements call for additional tests to be made and, when desired, one or more of these may be specified in the order.
1.3 Appendix X1 of this specification lists the dimensions of welded and seamless stainless steel pipe as shown in ANSI B36.19.
Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units
are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used
independently of the other. Combining values from the two systems may result in non-conformance with the standard. The
inch-pound units shall apply unless the M designation of this specification is specified in the order.
NOTE 1—The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as nominal diameter, size,
and nominal size.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A923 Test Methods for Detecting Detrimental Intermetallic Phase in Duplex Austenitic/Ferritic Stainless Steels
A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
A999/A999M Specification for General Requirements for Alloy and Stainless Steel Pipe
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.10
on Stainless and Alloy Steel Tubular Products.
Current edition approved May 1, 2023March 1, 2024. Published May 2023March 2024. Originally approved in 1981. Last previous edition approved in 20222023 as
A790/A790M – 22.A790/A790M – 23. DOI: 10.1520/A0790_A0790M-23.10.1520/A0790_A0790M-24.
For ASME Boiler and Pressure Vessel Code applications see related Specification SA–790 in Section II of that Code.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on 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
A790/A790M − 24
E213 Practice for Ultrasonic Testing of Metal Pipe and Tubing
E309 Practice for Eddy Current Examination of Steel Tubular Products Using Magnetic Saturation
E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings
E426 Practice for Electromagnetic (Eddy Current) Examination of Seamless and Welded Tubular Products, Titanium, Austenitic
Stainless Steel and Similar Alloys
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
2.2 ANSI Standards:
B1.20.1 Pipe Threads, General Purpose
B36.10 Welded and Seamless Wrought Steel Pipe
B36.19 Stainless Steel Pipe
2.3 SAE Standard:
SAE J 1086
2.4 Other Standard:
SNT-TC-1A Personal Qualification and Certification in Nondestructive Testing
2.5 AWS Standard:
A5.9 Corrosion-Resisting Chromium and Chromium-Nickel Steel Welding Rods and Electrodes
3. Terminology
3.1 Definitions—For definitions of terms used in this specification refer to Terminology A941.
4. Ordering Information
4.1 Orders for material under this specification should include the following, as required, to describe the desired material
adequately:
4.1.1 Quantity (feet, [metres], or number of lengths),
4.1.2 Name of material (ferritic/austenitic steel pipe),
4.1.3 Process (seamless or welded),
4.1.4 Grade (see Table 1),
4.1.5 Size (NPS designator or outside diameter and schedule number of average wall thickness),
4.1.6 Length (specific or random) (see Section 11),
4.1.7 End finish (section on ends of Specification A999/A999M),
4.1.8 Optional requirements (product analysis, Section 9; hydrostatic test or nondestructive electric test, Section 14),
4.1.9 Test report required (section on certification of Specification A999/A999M),
4.1.10 Specification designation, and
4.1.11 Special requirements and any supplementary requirements selected.
5. General Requirements
5.1 Material furnished under this specification shall conform to the applicable requirements of the current edition of Specification
A999/A999M unless otherwise provided herein.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http://www.sae.org.
Available from American Society for Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
Available from American Welding Society (AWS), 550 NW LeJeune Rd., Miami, FL 33126, http://www.aws.org.
A790/A790M − 24
TABLE 1 Heat Treatment
UNS
A
Type Temperature °F [°C] Quench
Designation
S31200 1920–2010 Rapid cooling in water
[1050–1100]
S31260 1870–2010 Rapid cooling in water or by
[1020–1100] other means
S31500 1800–1900 Rapid cooling in water or by
[980–1040] other means
S31803 1870–2010 Rapid cooling in water or by
[1020–1100] other means
S32003 1850–2050 Rapid cooling in water or by
[1010–1120] other means
S32101 1870 [1020] Rapid cooling in water or by
other means
S32202 1870–1975 Rapid cooling in water or by
[1020–1080] other means
S32205 2205 1870–2010 Rapid cooling in water or by
[1020–1100] other means
S32304 2304 1700–1920 Rapid cooling in water or by
[925–1050] other means
S32506 1870–2050 Rapid cooling in water or by
[1020–1120] other means
S32520 1975–2050 Rapid cooling in water or by
[1080–1120] other means
S32550 255 1900 [1040] min Rapid cooling in water or by
other means
S32707 1975–2050 Rapid cooling in water or by
[1080–1120] other means
S32750 2507 1880–2060 Rapid cooling in water or by
[1025–1125] other means
S32760 1960–2085 Rapid cooling in water or by
[1070–1140] other means
S32808 1920–2100 Rapid cooling in water or by
[1050–1150] other means
S32900 329 1700–1750 Rapid cooling in water or by
[925–955] other means
S32906 1870–2100 Rapid cooling in water or by
[1020–1150] other means
S32950 1820–1880 Air cool
[990–1025]
S33207 1905–2085 Rapid cooling in water or by
[1040–1140] other means
S39274 1920–2060 Rapid cooling in water or by
[1050–1125] other means
S39277 1975–2155 Rapid cooling in water or by
[1080–1180] other means
S81921 1760–2010 Rapid cooling in water or by
[960–1100] other means
S82011 1850–2050 Rapid cooling in water or by
[1010–1120] other means
S82121 1830–2010 Rapid cooling in water or by
[1000–1100] other means
S82441 1870 [1020] Rapid cooling in water or by
other means
S83071 . . . 1830–2100 Rapid cooling in water or by
[1000–1150] other means
S83072 . . . 1830–2100 Rapid cooling in water or by
[1000–1150] other means
A
Common name, not a trademark, widely used, not associated with any one
producer. 329 is an AISI number.
6. Materials and Manufacture
6.1 Manufacture:
6.1.1 The pipe shall be made by the seamless or an automatic welding process, with no addition of filler metal in the welding
operation.
6.1.2 At the manufacturer’s option, pipe may be either hot-finished or cold-finished.
6.1.3 The pipe shall be pickled free of scale. When bright annealing is used, pickling is not necessary.
A790/A790M − 24
6.2 Discard—A sufficient discard shall be made from each ingot to secure freedom from injurious piping and undue segregation.
6.3 Unless otherwise stated in the order, all pipe shall be furnished in the heat-treated condition as shown in Table 1.
6.3.1 For seamless pipe, as an alternate to final heat treatment in a continuous furnace or batch-type furnace, immediately
following hot forming while the temperature of the pipes is not less than the specified minimum solution treatment temperature,
pipes shall be individually quenched in water or rapidly cooled by other means, except for UNS S32950, which shall be air cooled.
6.3.2 If the purchaser desires pipe without heat treatment subsequent to welding, the purchase order shall specify the following
condition:
6.3.2.1 No final heat treatment of pipe fabricated from plate that has been heat treated as required by Table 1 for the particular
grade is required, provided a sample of that heat of finished pipe or material representative of that heat of pipe as a prolongation
of the weld passes the Test Methods A923 Method B or C (See Note 2), including base metal, weld metal, and heat affected zone
per heat. Each pipe supplied under this requirement shall be stenciled with the suffix “HT-O.”
6.3.2.2 For materials not listed in Table 3 of Test Methods A923, the HT-O provision does not apply.
NOTE 2—The Test Methods A923 test method (B or C) is at the manufacturer’s option, unless otherwise specified by the purchaser.
7. Chemical Composition
7.1 The steel shall conform to the chemical requirements as prescribed in Table 2.
8. Heat Analysis
8.1 An analysis of each heat of steel shall be made by the steel manufacturer to determine the percentages of the elements
specified.
9. Product Analysis
9.1 At the request of the purchaser’s inspector, an analysis of one billet or one length of flat-rolled stock from each heat, or two
pipes from each lot, shall be made by the manufacturer. A lot of pipe shall consist of the following number of lengths of the same
size and wall thickness from any one heat of steel:
NPS Designator Lengths of Pipe in Lot
Under 2 400 or fraction thereof
2 to 5, incl 200 or fraction thereof
6 and over 100 or fraction thereof
9.2 The results of these analyses shall be reported to the purchaser or the purchaser’s representative and shall conform to the
requirements specified in Section 7.
9.3 If the analysis of one of the tests specified in 8.1 or 9.1 does not conform to the requirements specified in Section 7, an analysis
of each billet or pipe from the same heat or lot may be made, and all billets or pipe conforming to the requirements shall be
accepted.
10. Tensile and Hardness Properties
10.1 The material shall conform to the tensile and hardness properties prescribed in Table 3.
11. Lengths
11.1 Pipe lengths shall be in accordance with the following regular practice:
11.1.1 Unless otherwise agreed upon, all sizes from NPS ⁄8 to and including NPS 8 are available in a length up to 24 ft (see Note
A790/A790M − 24
A
TABLE 2 Chemical Requirements
UNS
C
Designa- Type C Mn P S Si Ni Cr Mo N Cu Others
B
tion
S31200 0.030 2.00 0.045 0.030 1.00 5.5–6.5 24.0–26.0 1.20–2.00 0.14–0.20 . . . . . .
S31260 0.030 1.00 0.030 0.030 0.75 5.5–7.5 24.0–26.0 2.5–3.5 0.10–0.30 0.20–0.80 W
0.10–
0.50
S31500 0.030 1.20–2.00 0.030 0.030 1.40–2.00 4.2–5.2 18.0–19.0 2.50–3.00 0.05–0.10 . . . . . .
S31803 0.030 2.00 0.030 0.020 1.00 4.5–6.5 21.0–23.0 2.5–3.5 0.08–0.20 . . . . . .
S32003 0.030 2.00 0.030 0.020 1.00 3.0–4.0 19.5–22.5 1.50–2.00 0.14–0.20 . . . . . .
S32101 0.040 4.0–6.0 0.040 0.030 1.00 1.35–1.70 21.0–22.0 0.10–0.80 0.20–0.25 0.10–0.80 . . .
S32202 0.030 2.00 0.040 0.010 1.00 1.00–2.80 21.5–24.0 0.45 0.18–0.26 . . . . . .
S32205 2205 0.030 2.00 0.030 0.020 1.00 4.5–6.5 22.0–23.0 3.0–3.5 0.14–0.20 . . . . . .
S32304 2304 0.030 2.50 0.040 0.040 1.00 3.0–5.5 21.5–24.5 0.05–0.60 0.05–0.20 0.05–0.60 . . .
S32506 0.030 1.00 0.040 0.015 0.90 5.5–7.2 24.0–26.0 3.0–3.5 0.08–0.20 . . . W
0.05–
0.30
S32520 0.030 1.5 0.035 0.020 0.80 5.5–8.0 24.0–26.0 3.0–5.0 0.20–0.35 0.5–3.00 . . .
S32550 255 0.04 1.50 0.040 0.030 1.00 4.5–6.5 24.0–27.0 2.9–3.9 0.10–0.25 1.50–2.50 . . .
S32707 0.030 1.50 0.035 0.010 0.50 5.5–9.5 26.0–29.0 4.0–5.0 0.30–0.50 1.0 Co
0.5–
2.0
D
S32750 2507 0.030 1.20 0.035 0.020 0.80 6.0–8.0 24.0–26.0 3.0–5.0 0.24–0.32 0.5 . . .
E
S32760 0.030 1.00 0.030 0.010 1.00 6.0–8.0 24.0–26.0 3.0–4.0 0.20–0.30 0.50–1.00 W
0.50–
1.00
S32808 0.030 1.10 0.030 0.010 0.50 7.0–8.2 27.0–27.9 0.80–1.20 0.30–0.40 . . . W
2.10–
2.50
S32900 329 0.08 1.00 0.040 0.030 0.75 2.5–5.0 23.0–28.0 1.00–2.00 . . . . . . . . .
S32906 0.030 0.80–1.50 0.030 0.030 0.80 5.8–7.5 28.0–30.0 1.50–2.60 0.30–0.40 0.80 . . .
S32950 0.030 2.00 0.035 0.010 0.60 3.5–5.2 26.0–29.0 1.00–2.50 0.15–0.35 . . . . . .
S33207 0.030 1.50 0.035 0.010 0.80 6.0–9.0 29.0–33.0 3.0–5.0 0.40–0.60 1.0
S39274 0.030 1.00 0.030 0.020 0.80 6.0–8.0 24.0–26.0 2.5–3.5 0.24–0.32 0.20–0.80 W
1.50–
2.50
S39277 0.025 0.80 0.025 0.002 0.80 6.5–8.0 24.0–26.0 3.0–4.0 0.23–0.33 1.20–2.00 W
0.8–
1.2
S81921 0.030 2.00–4.00 0.040 0.030 1.00 2.00–4.00 19.0–22.0 1.00–2.00 0.14–0.20 . . . . . .
S82011 0.030 2.0–3.0 0.040 0.020 1.00 1.00–2.00 20.5–23.5 0.10–1.00 0.15–0.27 0.50 . . .
S82121 . . . 0.035 1.00–2.50 0.040 0.010 1.00 2.00–4.00 21.0–23.0 0.30–1.30 0.15–0.25 0.20–1.20 . . .
S82441 0.030 2.5–4.0 0.035 0.005 0.70 3.0–4.5 23.0–25.0 1.00–2.00 0.20–0.30 0.10–0.80
S83071 . . . 0.030 0.50–1.50 0.030 0.020 0.50 6.0–8.0 29.0–31.0 3.0–4.0 0.28–0.40 0.80 . . .
S83072 . . . 0.030 0.50–1.50 0.030 0.030 0.30 6.0–8.0 28.5–30.5 0.7–1.7 0.35–0.45 0.5 W 3.0-4.0
A
Maximum, unless a range or minimum is indicated. Where ellipses (.) appear in this table, there is no minimum and analysis for the element need not be determined
or reported.
B
New designation established in accordance with Practice E527 and SAE J 1086.
C
Common name, not a trademark, widely used, not associated with any one producer. 329 is an AISI number.
D
% Cr + 3.3 × % Mo + 16 × % N $ 41.
E
% Cr + 3.3 × (% Mo + 0.5 %W) + 16 × % N $ 41.
3) with the permissible range of 15 to 24 ft (see Note 3). Short lengths are acceptable and the number and minimum length shall
be agreed upon between the manufacturer and the purchaser.
NOTE 3—This value applies when the inch-pound designation of this specification is the basis of purchase. When the M designation of this specification
is the basis of purchase, the corresponding metric value(s) shall be agreed upon between the manufacturer and purchaser.
11.1.2 If definite cut lengths are desired, the lengths required shall be specified in the order. No pipe shall be less than the specified
length and no more than ⁄4 in. [6 mm] over it.
11.1.3 No jointers are permitted unless otherwise specified.
12. Workmanship, Finish, and Appearance
12.1 The finished pipes shall be reasonably straight and shall have a workmanlike finish. Imperfections may be removed by
grinding, provided the wall thicknesses are not decreased to less than that permitted, in the Permissible Variations in Wall
Thickness Section of Specification A999/A999M.
A790/A790M − 24
TABLE 3 Tensile and Hardness Requirements
Tensile Yield Elongation
Hardness, max
UNS Strength, Strength, in 2 in. or
A
Type
Designation min, ksi min, 50 mm,
HBW HRC
[MPa] ksi [MPa] min, %
S31200 100 [690] 65 [450] 25 280 . . .
S31260 100 [690] 65 [450] 25 . . . . . .
S31500 92 [630] 64 [440] 30 290 30
S31803 90 [620] 65 [450] 25 290 30
S32003
t # 100 [690] 70 [485] 25 290 30
0.187 in.
[5.00 mm]
t > 95 [655] 65 [450] 25 290 30
0.187 in.
[5.00 mm]
S32101
t # 101 [700] 77 [530] 30 290 . . .
0.187 in.
[5.00 mm]
t > 94 [650] 65 [450] 30 290 . . .
0.187 in.
[5.00 mm]
S32202 94 [650] 65 [450] 30 290 30
S32205 2205 95 [655] 65 [450] 25 290 30
S32304 2304 87 [600] 58 [400] 25 290 30
S32506 90 [620] 65 [450] 18 302 32
S32520 112 [770] 80 [550] 25 310 . . .
S32550 255 110 [760] 80 [550] 15 297 31
S32707 133 [920] 101 [700] 25 318 34
S32750 2507 116 [800] 80 [550] 15 300 32
B
S32760 109 [750] 80 [550] 25 310 32
S32808
t < 116 [800] 80 [550] 15 310 32
0.40 in.
[10 mm]
t $ 101 [700] 72 [500] 15 310 32
0.40 in.
[10 mm]
S32900 329 90 [620] 70 [485] 20 271 28
S32906
t < 116 [800] 94 [650] 25 300 32
0.40 in.
[10 mm]
t $ 109 [750] 80 [550] 25 300 32
0.40 in.
[10 mm]
S32950 100 [690] 70 [480] 20 290 30
S33207
t < 138 [950] 112 [770] 15 336 36
0.157 in.
[4 mm]
t $ 123 [850] 101 [700] 15 336 36
0.157 in.
[4 mm]
S39274 116 [800] 80 [550] 15 310 32
S39277 120 [825] 90 [620] 25 290 30
S81921 90 [620] 65 [450] 25 290 30
S82011
t < 101 [700] 75 [515] 30 293 31
0.187 in.
[5.00 mm]
t $ 95 [655] 65 [450] 30 293 31
0.187 in.
[5.00 mm]
S82121 . . . 94 [650] 65 [450] 25 286 30
S82441
t < 107 [740] 78 [540] 25 290 . . .
0.4 in.
[10 mm]
t $ 99 [680] 70 [480] 25 290 . . .
0.4 in.
[10 mm]
S83071 . . . 120 [830] 98 [680] 25 300 32
S83072 . . . 120 [830] 94 [650] 25 327 35
A790/A790M − 24
A
Common name, not a trademark, widely used, not associated with any one producer. 329 is an AISI number.
B
Prior to A790/A790M – 04, the tensile strength value for UNS 32760 was 109–130 ksi [750–895 MPa].
13. Mechanical Tests Required
13.1 Transverse or Longitudinal Tension Test—One tension test shall be made on a specimen for lots of not more than 100 pipes.
Tension tests shall be made on specimens from 2 pipes for lots of more than 100 pipes.
13.2 Mechanical Testing Lot Definition—The term lot for mechanical tests applies to all pipe of the same nominal size and wall
thickness (or schedule) that is produced from the same heat of steel and subjected to the same finishing treatment as defined as
follows:
13.2.1 Where the heat treated condition is obtained, consistent with the requirements of 6.3, in a continuous heat treatment furnace
or by directly obtaining the heat treated condition by quenching after hot forming, the lot shall include all pipe of the same size
and heat, heat treated in the same furnace at the same temperature, time at heat, and furnace speed or all pipe of the same size and
heat, hot formed and quenched in the same production run.
13.2.2 Where final heat treatment is obtained, consistent with the requirements of 6.3, in a batch-type heat-treatment furnace
equipped with recording pyrometers and automatically controlled within a 50 °F [30 °C] or smaller range, the lot shall be the larger
of (a) each 200 ft [60 m] or fraction thereof or (b) that pipe heat treated in the same batch furnace charge.
13.2.3 Where the final heat treatment is obtained, consistent with the requirements of 6.3, in a batch-type heat-treatment furnace
not equipped with recording pyrometers and automatically controlled within a 50 °F [30 °C] or smaller range, the term lot for
mechanical tests applies to the pipe heat treated in the same batch furnace charge, provided that such pipe is of the same nominal
size and wall thickness (or schedule) and is produced from the same heat of steel.
13.3 Flattening Test—For pipe heat treated in a batch-type furnace, flattening tests shall be made on 5 % of the pipe from each
heat-treated lot. For pipe heat treated by the co
...