ASTM A268/A268M-04
(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 A 789/A 789M and A 790/A 790M.
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 – 04
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* 2. Referenced Documents
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1.1 This specification covers a number of grades of 2.1 ASTM Standards:
nominal-wall-thickness, stainless steel tubing for general A 480/A 480M Specification for General Requirements for
corrosion-resisting and high-temperature service. Most of these Flat-Rolled Stainless and Heat-Resisting Steel Plate,
grades are commonly known as the “straight-chromium” types Sheet, and Strip
and are characterized by being ferromagnetic. Two of these A 763 Practices for Detecting Susceptibility to Intergranu-
grades, TP410 and UNS S 41500 (Table 1), are amenable to lar Attack in Ferritic Stainless Steels
hardening by heat treatment, and the high-chromium, ferritic A 789/A 789M Specification for Seamless and Welded
alloys are sensitive to notch-brittleness on slow cooling to Ferritic/Austenitic Stainless Steel Tubing for General Ser-
ordinary temperatures. These features should be recognized in vice
the use of these materials. Grade TP439 is used primarily for A 790/A 790M Specification for Seamless and Welded
hot-water tank service and does not require post-weld heat Ferritic/Austenitic Stainless Steel Pipe
treatment to prevent attack of the heat affected zone. A 941 Terminology Relating to Steel, Stainless Steel, Re-
lated Alloys, and Ferroalloys
NOTE 1—TP329 (S32900) formerly in this specification, has been
A 1016/A 1016M Specification for General Requirements
transferred to Specifications A 789/A 789M and A 790/A 790M.
for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stain-
1.2 An optional supplementary requirement is provided, and
less Steel Tubes
when desired, shall be so stated in the order.
E 213 Practice for Ultrasonic Examination of Metal Pipe
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and Tubing
NOTE 2—For tubing smaller than ⁄2 in. [12.7 mm] in outside diameter,
the elongation values given for strip specimens in Table 2 shall apply.
E 273 Practice for Ultrasonic Examination of the Weld
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Mechanical property requirements do not apply to tubing smaller than ⁄8
Zone of Welded Pipe and Tubing
in. [3.2 mm] in outside diameter or with walls thinner than 0.015 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
4. Ordering Information
system are not exact equivalents; therefore, each system must
be used independently of the other. Combining values from the
4.1 It is the responsibility of the purchaser to specify all
two systems may result in nonconformance with the specifi-
requirements that are necessary for material ordered under this
cation. The inch-pound units shall apply unless the “M”
specification. Such requirements may include, but are not
designation of this specification is specified in the order.
limited to, the following:
4.1.1 Quantity (feet, metres, or number of lengths),
4.1.2 Name of material (seamless or welded tubes),
4.1.3 Grade (Table 1),
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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
A01.10 on Stainless and Alloy Steel Tubular Products.
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Current edition approved May 1, 2004. Published June 2004. Originally For referenced ASTM standards, visit the ASTM website, www.astm.org, or
approved in 1944. Last previous edition approved in 2003 as A 268/A 268M – 03. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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For ASME Boiler and Pressure Vessel Code applications see related Specifi- Standards volume information, refer to the standard’s Document Summary page on
cation SA-268 in Section II of that Code. the ASTM website.
*A Summary of Changes section appears at the end of this standard.
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A 268/A 268M – 04
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TABLE 1 Chemical Requirements
NOTE 1— TP329 (S32900), formerly part of this specification, has been transferred to A 789/A 789M and A 790/A 790M.
A
Grade TP405 TP410 TP429 TP430 TP443 TP446–1 TP446–2 . . . TP409
UN
...
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