ASTM A268/A268M-04a
(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 – 04a
Standard Specification for
Seamless and Welded Ferritic and Martensitic Stainless
1
Steel Tubing for General Service
This standard is issued under the fixed designationA 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 1016/A 1016M Specification for General Requirements
2 for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stain-
1.1 This specification covers a number of grades of
less Steel Tubes
nominal-wall-thickness, stainless steel tubing for general
E 213 Practice for Ultrasonic Examination of Metal Pipe
corrosion-resistingandhigh-temperatureservice.Mostofthese
and Tubing
grades are commonly known as the “straight-chromium” types
E 273 Practice for Ultrasonic Examination of the Weld
and are characterized by being ferromagnetic. Two of these
Zone of Welded Pipe and Tubing
grades, TP410 and UNS S 41500 (Table 1), are amenable to
hardening by heat treatment, and the high-chromium, ferritic
3. Terminology
alloys are sensitive to notch-brittleness on slow cooling to
3.1 Lot Definitions:
ordinary temperatures. These features should be recognized in
3.1.1 For flange and flaring requirements, the term lot
the use of these materials. Grade TP439 is used primarily for
applies to all tubes prior to cutting of the same nominal size
hot-water tank service and does not require post-weld heat
and wall thickness which are produced from the same heat of
treatment to prevent attack of the heat affected zone.
steel.When final heat treatment is in a batch-type furnace, a lot
1.2 Anoptionalsupplementaryrequirementisprovided,and
shall include only those tubes of the same size and from the
when desired, shall be so stated in the order.
same heat which are heat treated in the same furnace charge.
1.3 The values stated in either inch-pound units or SI units
When the final heat treatment is in a continuous furnace, the
are to be regarded separately as standard. Within the text, the
number of tubes of the same size and from the same heat in a
SI units are shown in brackets. The values stated in each
lot shall be determined from the size of the tubes as prescribed
system are not exact equivalents; therefore, each system must
in Table 2.
be used independently of the other. Combining values from the
3.1.2 Fortensileandhardnesstestrequirements,thetermlot
two systems may result in nonconformance with the specifi-
applies to all tubes prior to cutting, of the same nominal
cation. The inch-pound units shall apply unless the “M”
diameter and wall thickness that are produced from the same
designation of this specification is specified in the order.
heat of steel. When final heat treatment is in a batch-type
2. Referenced Documents furnace, a lot shall include only those tubes of the same size
3 and the same heat which are heat treated in the same furnace
2.1 ASTM Standards:
charge. When the final heat treatment is in a continuous
A 480/A 480M Specification for General Requirements for
furnace, a lot shall include all tubes of the same size and heat,
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
heat treated in the same furnace at the same temperature, time
Sheet, and Strip
at heat, and furnace speed.
A 763 Practices for Detecting Susceptibility to Intergranu-
lar Attack in Ferritic Stainless Steels
4. Ordering Information
4.1 It is the responsibility of the purchaser to specify all
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, requirements that are necessary for material ordered under this
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
specification. Such requirements may include, but are not
A01.10 on Stainless and Alloy Steel Tubular Products.
limited to, the following:
Current edition approved Sept. 1, 2004. Published September 2004. Originally
4.1.1 Quantity (feet, metres, or number of lengths),
approved in 1944. Last previous edition approved in 2004 as A 268/A 268M – 04.
2
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
4.1.2 Name of material (seamless or welded tubes),
cation SA-268 in Section II of that Code.
4.1.3 Grade (Table 1),
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.1.4 Size (outside diameter and nominal wall thickness),
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.
*ASummary of Changes section appears at the end of this standard.
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