ASTM A268/A268M-01
(Specification)Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
SCOPE
1.1 This specification covers a number of grades of nominal-wall-thickness, stainless steel tubing for general corrosion-resisting and high-temperature service. Most of these grades are commonly known as the "straight-chromium" types and are characterized by being ferromagnetic. Two of these grades, TP410 and UNS S 41500 (Table 1), are amenable to hardening by heat treatment, and the high-chromium, ferritic alloys are sensitive to notch-brittleness on slow cooling to ordinary temperatures. These features should be recognized in the use of these materials. Grade TP439 is used primarily for hot-water tank service and does not require post-weld heat treatment to prevent attack of the heat affected zone.
Note 1--TP329 (S32900) formerly in this specification, has been transferred to Specifications A789/A789M and A790/A790M.
1.2 An optional supplementary requirement is provided, and when desired, shall be so stated in the order.
Note 2--For tubing smaller than 1/2 in. [12.7 mm] in outside diameter, the elongation values given for strip specimens in shall apply. Mechanical property requirements do not apply to tubing smaller than 1/8 in. [3.2 mm] in outside diameter or with walls thinner than 0.015 in. [0.4 mm].
1.3 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 specification. The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.
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Designation: A 268/A 268M – 01
Standard Specification for
Seamless and Welded Ferritic and Martensitic Stainless
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Steel Tubing for General Service
This standard is issued under the fixed designation A 268/A 268M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope A 450/A 450M Specification for General Requirements for
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Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes
1.1 This specification covers a number of grades of
A 480/A 480M Specification for General Requirements for
nominal-wall-thickness, stainless steel tubing for general
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
corrosion-resisting and high-temperature service. Most of these
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Sheet, and Strip
grades are commonly known as the “straight-chromium” types
A 763 Practices for Detecting Susceptibility to Intergranu-
and are characterized by being ferromagnetic. Two of these
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lar Attack in Ferritic Stainless Steels
grades, TP410 and UNS S 41500 (Table 1), are amenable to
A 789/A 789M Specification for Seamless and Welded
hardening by heat treatment, and the high-chromium, ferritic
Ferritic/Austenitic Stainless Steel Tubing for General Ser-
alloys are sensitive to notch-brittleness on slow cooling to
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vice
ordinary temperatures. These features should be recognized in
A 790/A 790M Specification for Seamless and Welded
the use of these materials. Grade TP439 is used primarily for
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Ferritic/Austenitic Stainless Steel Pipe
hot-water tank service and does not require post-weld heat
A 941 Terminology Relating to Steel, Stainless Steel, Re-
treatment to prevent attack of the heat affected zone.
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lated Alloys, and Ferroalloys
NOTE 1—TP329 (S32900) formerly in this specification, has been
E 213 Practice for Ultrasonic Examination of Metal Pipe
transferred to Specifications A 789/A 789M and A 790/A 790M.
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and Tubing
1.2 An optional supplementary requirement is provided, and
E 273 Practice for Ultrasonic Examination of Longitudinal
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when desired, shall be so stated in the order.
Welded Pipe and Tubing
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E 527 Practice for Numbering Metals and Alloys (UNS)
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NOTE 2—For tubing smaller than ⁄2 in. [12.7 mm] in outside diameter,
2.2 Other Standard:
the elongation values given for strip specimens in Table 2 shall apply.
SAE J1086 Practice for Numbering Metals and Alloys
Mechanical property requirements do not apply to tubing smaller
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than ⁄8 in. [3.2 mm] in outside diameter or with walls thinner than 0.015
(UNS)
in. [0.4 mm].
3. Terminology
1.3 The values stated in either inch-pound units or SI units
3.1 For definitions of terms used in this specification, refer
are to be regarded separately as standard. Within the text, the
to Terminology A 941.
SI units are shown in brackets. The values stated in each
system are not exact equivalents; therefore, each system must
4. Ordering Information
be used independently of the other. Combining values from the
4.1 Orders for material under this specification should
two systems may result in nonconformance with the specifi-
include the following, as required, to describe the desired
cation. The inch-pound units shall apply unless the “M”
material adequately:
designation of this specification is specified in the order.
4.1.1 Quantity (feet, metres, or number of lengths),
2. Referenced Documents
4.1.2 Name of material (seamless or welded tubes),
4.1.3 Grade (Table 1),
2.1 ASTM Standards:
4.1.4 Size (outside diameter and nominal wall thickness),
4.1.5 Length (specific or random),
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This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
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A01.10 on Stainless and Aloy Steel Tubular Products. Annual Book of ASTM Standards, Vol 01.01.
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Current edition approved Mar. 10, 2001. Published June 2001. Originally Annual Book of ASTM Standards, Vol 01.03.
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published as A 268 – 44 T. Last previous edition A 268/A 268M – 00a. Annual Book of ASTM Standards, Vol 03.03.
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For ASME Boiler and Pressure Vessel Code applications see related Specifi- Available from Society of Automotive Engineers, 400 Commonwealth Drive,
cation SA-268 in Section II of that Code. Warrendale, PA 15096.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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A 268/A 268M – 01
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest info
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