Designation: A 790/A 790M – 05b
Standard Specification for
Seamless and Welded Ferritic/Austenitic Stainless Steel
Pipe
1
This standard is issued under the fixed designation A 790/A 790M; 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*
1.1 This specification
2
covers seamless and straight-seam
welded ferritic/austenitic steel pipe intended for general corro-
sive service, with particular emphasis on resistance to stress
corrosion cracking. These steels are susceptible to embrittle-
ment 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 inch-pound units or SI units
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
system are not exact equivalents; therefore, each system must
be used independently of the other. Combining values from the
two systems may result in nonconformance with the specifi-
cation. The inch-pound units shall apply unless the M desig-
nation 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.
2. Referenced Documents
2.1 ASTM Standards:
3
A 370 Test Methods and Definitions for Mechanical Testing
of Steel Products
A 941 Terminology Relating to Steel, Stainless Steel, Re-
lated Alloys and Feroalloys
A 999/A 999M Specification for General Requirements for
Alloy and Stainless Steel Pipe
E 213 Practice for Ultrasonic Examination of Metal Pipe
and Tubing
E 309 Practice for Eddy-Current Examination of Steel Tu-
bular Products Using Magnetic Saturation
E 381 Method of Macroetch Testing Steel Bars, Billets,
Blooms, and Forgings
E 426 Practice for Electromagnetic (Eddy-Current) Exami-
nation of Seamless and Welded Tubular Products, Austen-
itic Stainless Steel and Similar Alloys
E 527 Practice for Numbering Metals and Alloys (UNS)
2.2 ANSI Standards:
4
B1.20.1 Pipe Threads, General Purpose
B36.10 Welded and Seamless Wrought Steel Pipe
B36.19 Stainless Steel Pipe
2.3 SAE Standard:
5
SAE J 1086
2.4 Other Standard:
6
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 speci-
fication refer to Terminology
A 941.
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),
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
A01.10 on Stainless and Alloy Steel Tubular Products.
Current edition approved September 15, 2005. Published October 2005. Origi-
nally approved in 1981. Last previous edition approved in 2005 as A 790/
A 790M – 05a.
2
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SA–790 in Section II of that Code.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
4
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036.
5
Available from Society of Automotive Engineers (SAE), 400 Commonwealth
Dr., Warrendale, PA 15096-0001.
6
Available from The American Society for Nondestructive Testing (ASNT), P.O.
Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518.
1
*A Summary of Changes section appears at the end of this standard.
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