ASTM A268/A268M-03
(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 – 03
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 480/A 480M Specification for General Requirements for
2 Flat-Rolled Stainless and Heat-Resisting Steel Plate,
1.1 This specification covers a number of grades of
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Sheet, and Strip
nominal-wall-thickness, stainless steel tubing for general
A 763 Practices for Detecting Susceptibility to Intergranu-
corrosion-resisting and high-temperature service. Most of these
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lar Attack in Ferritic Stainless Steels
grades are commonly known as the “straight-chromium” types
A 789/A 789M Specification for Seamless and Welded
and are characterized by being ferromagnetic. Two of these
Ferritic/Austenitic Stainless Steel Tubing for General Ser-
grades, TP410 and UNS S 41500 (Table 1), are amenable to
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vice
hardening by heat treatment, and the high-chromium, ferritic
A 790/A 790M Specification for Seamless and Welded
alloys are sensitive to notch-brittleness on slow cooling to
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Ferritic/Austenitic Stainless Steel Pipe
ordinary temperatures. These features should be recognized in
A 941 Terminology Relating to Steel, Stainless Steel, Re-
the use of these materials. Grade TP439 is used primarily for
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lated Alloys, and Ferroalloys
hot-water tank service and does not require post-weld heat
A 1016/A 1016M Specification for General Requirements
treatment to prevent attack of the heat affected zone.
for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stain-
NOTE 1—TP329 (S32900) formerly in this specification, has been 4
less Steel Tubes
transferred to Specifications A 789/A 789M and A 790/A 790M.
E 213 Practice for Ultrasonic Examination of Metal Pipe
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1.2 An optional supplementary requirement is provided, and
and Tubing
when desired, shall be so stated in the order.
E 273 Practice for Ultrasonic Examination of the Weld
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Zone of Welded Pipe and Tubing
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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.
3. Terminology
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Mechanical property requirements do not apply to tubing smaller than ⁄8
in. [3.2 mm] in outside diameter or with walls thinner than 0.015 in. [0.4 3.1 For definitions of terms used in this specification, refer
mm].
to Terminology A 941.
1.3 The values stated in either inch-pound units or SI units
4. Ordering Information
are to be regarded separately as standard. Within the text, the
4.1 It is the responsibility of the purchaser to specify all
SI units are shown in brackets. The values stated in each
requirements that are necessary for material ordered under this
system are not exact equivalents; therefore, each system must
specification. Such requirements may include, but are not
be used independently of the other. Combining values from the
limited to, the following:
two systems may result in nonconformance with the specifi-
4.1.1 Quantity (feet, metres, or number of lengths),
cation. The inch-pound units shall apply unless the “M”
4.1.2 Name of material (seamless or welded tubes),
designation of this specification is specified in the order.
4.1.3 Grade (Table 1),
2. Referenced Documents
4.1.4 Size (outside diameter and nominal wall thickness),
4.1.5 Length (specific or random),
2.1 ASTM Standards:
4.1.6 Optional requirements (hydrostatic or nondestructive
electric test, Section 15),
4.1.7 Test report required (Certification Section of Specifi-
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This specification is under the jurisdiction of ASTM Committee A01 on Steel,
cation A 1016/A 1016M),
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
A01.10 on Stainless and Aloy Steel Tubular Products.
Current edition approved Sept. 10, 2003. Published October 2003. Originally
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approved in 1944. Last previous edition approved in 2001 as A 268/A 268M – 01. Annual Book of ASTM Standards, Vol 01.03.
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For ASME Boiler and Pressure Vessel Code applications see related Specifi- Annual Book of ASTM Standards, Vol 01.01.
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cation SA-268 in Section II of that Code. Annual Book of ASTM Standards, Vol 03.03.
*A Summary of Changes section appears at the end of this standard.
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A 268/A 268M – 03
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TABLE 1 Chemical Requirements
NOTE 1— TP329 (
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