ASTM A268/A268M-05

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 (), 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.

General Information

• Status: Historical
• Publication Date: 28-Feb-2005
• ICS: 23.040.10 - Iron and steel pipes
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.10 - Stainless and Alloy Steel Tubular Products

Relations

• Replaces: ASTM A268/A268M-04a - Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
• Effective Date: 01-Mar-2005
• Replaced By: ASTM A268/A268M-05a - Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
• Effective Date: 01-Sep-2005
• Referred By: ASTM A1016/A1016M-18a - Standard Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes
• Effective Date: 01-Mar-2005
• Referred By: ASTM F1047-17(2023) - Standard Specification for Frying and Braising Pans, Tilting Type
• Effective Date: 01-Mar-2005
• Referred By: ASTM A1012-10(2021) - Standard Specification for Seamless and Welded Ferritic, Austenitic and Duplex Alloy Steel Condenser and Heat Exchanger Tubes With Integral Fins
• Effective Date: 01-Mar-2005
• Referred By: ASTM A1119/A1119M-23a - Standard Specification for Welded Partially Corrugated Stainless Steel Tube for Potable Water and General Service
• Effective Date: 01-Mar-2005
• Referred By: ASTM A1098/A1098M-18(2022) - Standard Specification for Welded Austenitic, Ferritic, Martensitic and Duplex Stainless Steel Boiler, Superheater, Condenser, and Heat Exchanger Tubes with Textured Surface(s)
• Effective Date: 01-Mar-2005
• Referred By: ASTM F1217-17(2023) - Standard Specification for Cooker, Steam
• Effective Date: 01-Mar-2005

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
Designation: A 268/A 268M – 05
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 (ϵ) 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* lar Attack in Ferritic Stainless Steels
2 A 1016/A 1016M 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
E 213 Practice for Ultrasonic Examination of Metal Pipe
grades are commonly known as the “straight-chromium” types
and Tubing
and are characterized by being ferromagnetic. Two of these
E 273 Practice for Ultrasonic Examination of the Weld
grades, TP410 and UNS S 41500 (Table 1), are amenable to
Zone 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 which are produced from the same heat of
1.2 Anoptionalsupplementaryrequirementisprovided,and
steel.When 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 which are heat treated in the same furnace charge.
are to be regarded separately as standard. Within the text, the
When the final heat treatment is in a continuous furnace, the
SI units are shown in brackets. The values stated in each
number of tubes of the same size and from the same heat in a
system are not exact equivalents; therefore, each system must
lot shall be determined from the size of the tubes as prescribed
be used independently of the other. Combining values from the
in Table 2.
two systems may result in nonconformance with the specifi-
3.1.2 Fortensileandhardnesstestrequirements,thetermlot
cation. The inch-pound units shall apply unless the “M”
applies to all tubes prior to cutting, of the same nominal
designation of this specification is specified in the order.
diameter and wall thickness that are produced from the same
2. Referenced Documents heat of steel. When final heat treatment is in a batch-type
3 furnace, a lot shall include only those tubes of the same size
2.1 ASTM Standards:
and the same heat which are heat treated in the same furnace
A 480/A 480M Specification for General Requirements for
charge. When the final heat treatment is in a continuous
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
furnace, a lot shall include all tubes of the same size and heat,
Sheet, and Strip
heat treated in the same furnace at the same temperature, time
A 763 Practices for Detecting Susceptibility to Intergranu-
at heat, and furnace speed.
4. Ordering Information
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
4.1 It is the responsibility of the purchaser to specify all
A01.10 on Stainless and Alloy Steel Tubular Products.
requirements that are necessary for material ordered under this
Current edition approved March 1, 2005. Published March 2005. Originally
specification. Such requirements may include, but are not
approved in 1944. Last previous edition approved in 2004 asA 268/A 268M – 04a.
2
limited to, the following:
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SA-268 in Section II of that Code.
4.1.1 Quantity (feet, metres, or number of lengths),
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.1.2 Name of material (seamless or welded tubes),
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4.1.3 Grade (Table 1),
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 4.1.4 Size (outside diameter and nominal wall thickness),
*ASummary of Changes section appears at the end of this standard.
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