ASTM A268/A268M-00a
(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 – 00a An American National Standard
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.
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1. Scope Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes
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A 480/A 480M Specification for General Requirements for
1.1 This specification covers a number of grades of
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
nominal-wall-thickness, stainless steel tubing for general
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Sheet, and Strip
corrosion-resisting and high-temperature service. Most of these
A 763 Practices for Detecting Susceptibility to Intergranu-
grades are commonly known as the “straight-chromium” types
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lar Attack in Ferritic Stainless Steels
and are characterized by being ferromagnetic. Two of these
A 789/A 789M Specification for Seamless and Welded
grades, TP410 and UNS S 41500 (Table 1), are amenable to
Ferritic/Austenitic Stainless Steel Tubing for General Ser-
hardening by heat treatment, and the high-chromium, ferritic
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vice
alloys are sensitive to notch-brittleness on slow cooling to
A 790/A 790M Specification for Seamless and Welded
ordinary temperatures. These features should be recognized in
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Ferritic/Austenitic Stainless Steel Pipe
the use of these materials. Grade TP439 is used primarily for
A 941 Terminology Relating to Steel, Stainless Steel, Re-
hot-water tank service and does not require post-weld heat
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lated Alloys, and Ferroalloys
treatment to prevent attack of the heat affected zone.
E 213 Practice for Ultrasonic Examination of Metal Pipe
NOTE 1—TP329 (S32900) formerly in this specification, has been 5
and Tubing
transferred to Specifications A 789/A 789M and A 790/A 790M.
E 273 Practice for Ultrasonic Examination of Longitudinal
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1.2 An optional supplementary requirement is provided, and
Welded Pipe and Tubing
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when desired, shall be so stated in the order.
E 527 Practice for Numbering Metals and Alloys (UNS)
2.2 Other Standard:
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NOTE 2—For tubing smaller than ⁄2 in. [12.7 mm] in outside diameter,
SAE J1086 Practice for Numbering Metals and Alloys
the elongation values given for strip specimens in Table 2 shall apply.
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(UNS)
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
3. Terminology
in. [0.4 mm].
3.1 For definitions of terms used in this specification, refer
1.3 The values stated in either inch-pound units or SI units
to Terminology A 941.
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
4. Ordering Information
system are not exact equivalents; therefore, each system must
4.1 Orders for material under this specification should
be used independently of the other. Combining values from the
include the following, as required, to describe the desired
two systems may result in nonconformance with the specifi-
material adequately:
cation. The inch-pound units shall apply unless the “M”
4.1.1 Quantity (feet, metres, or number of lengths),
designation of this specification is specified in the order.
4.1.2 Name of material (seamless or welded tubes),
2. Referenced Documents
4.1.3 Grade (Table 1),
4.1.4 Size (outside diameter and nominal wall thickness),
2.1 ASTM Standards:
4.1.5 Length (specific or random),
A 450/A 450M Specification for General Requirements for
4.1.6 Optional requirements (hydrostatic or electric test,
14.7),
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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 Oct. 10, 2000. Published January 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 – 00 . 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, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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A 268/A 268M
TABLE 1 Chemical Requirements
NOTE 1— TP329 (S32900), formerly part of this specification, h
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