ASTM A268/A268M-05a
(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
ABSTRACT
This guide covers standard specification for a number of grades of nominal-wall-thickness, welded ferritic and martensitic stainless steel tubing for general corrosion-resisting and high-temperature service. The steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, aluminum, copper, nitrogen, titanium, and columbium. The number of tubes in a lot heat treated by the continuous process shall be determined from the size of the tubes. The steel shall conform to the following tensile properties: tensile strength, yield strength, and elongation. The tubes shall have a hardness number that will not exceed the prescribed Brinell and Rockwell hardness values. Several mechanical tests shall be conducted, namely: tension test; flaring test (for seamless tubes); flange test (for welded tubes); hardness test; reverse flattening test; intergranular corrosion test; and hydrostatic or nondestructive electric test.
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 (), 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.
1.2 An optional supplementary requirement is provided, and when desired, shall be so stated in the order.
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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Contact ASTM International (www.astm.org) for the latest information.
Designation: A268/A268M – 05a
Standard Specification for
Seamless and Welded Ferritic and Martensitic Stainless
1
Steel Tubing for General Service
This standard is issued under the fixed designationA268/A268M; 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 (´) 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* Attack in Ferritic Stainless Steels
2 A1016/A1016M Specification for General Requirements
1.1 This specification covers a number of grades of
for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stain-
nominal-wall-thickness, stainless steel tubing for general
less Steel Tubes
corrosion-resistingandhigh-temperatureservice.Mostofthese
E213 Practice for Ultrasonic Testing of Metal Pipe and
grades are commonly known as the “straight-chromium” types
Tubing
and are characterized by being ferromagnetic. Two of these
E273 Practice for Ultrasonic Examination of theWeld Zone
grades, TP410 and UNS S 41500 (Table 1), are amenable to
of Welded Pipe and Tubing
hardening by heat treatment, and the high-chromium, ferritic
alloys are sensitive to notch-brittleness on slow cooling to
3. Terminology
ordinary temperatures. These features should be recognized in
3.1 Lot Definitions:
the use of these materials. Grade TP439 is used primarily for
3.1.1 For flange and flaring requirements, the term lot
hot-water tank service and does not require post-weld heat
applies to all tubes, prior to cutting, of the same nominal size
treatment to prevent attack of the heat affected zone.
and wall thickness that are produced from the same heat of
1.2 Anoptionalsupplementaryrequirementisprovided,and
steel. If final heat treatment is in a batch-type furnace, a lot
when desired, shall be so stated in the order.
shall include only those tubes of the same size and from the
1.3 The values stated in either inch-pound units or SI units
same heat that are heat treated in the same furnace charge. If
are to be regarded separately as standard. Within the text, the
the final heat treatment is in a continuous furnace, the number
SI units are shown in brackets. The values stated in each
of tubes of the same size and from the same heat in a lot shall
system are not exact equivalents; therefore, each system must
be determined from the size of the tubes as given 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. If final heat treatment is in a batch-type furnace,
2. Referenced Documents a lot shall include only those tubes of the same size and the
3 same heat that are heat treated in the same furnace charge. If
2.1 ASTM Standards:
the final heat treatment is in a continuous furnace, a lot shall
A480/A480M Specification for General Requirements for
include all tubes of the same size and heat, heat treated in the
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
samefurnaceatthesametemperature,timeatheat,andfurnace
Sheet, and Strip
speed.
A763 Practices for Detecting Susceptibility to Intergranular
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
A01.10 on Stainless and Alloy Steel Tubular Products. specification. Such requirements may include, but are not
Current edition approved September 1, 2005. Published September 2005.
limited to, the following:
Originally approved in 1944. Last previous edition approved in 2005 as A268/
4.1.1 Quantity (feet, metres, or number of lengths),
A268M – 05. DOI: 10.1520/A0268_A0268M-05A.
2
4.1.2 Name of material (seamless or welded tubes),
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
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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