ASTM A268/A268M-24
(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 specification2 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.
TABLE 1 Continued
Grade
TP439
. . .
. . .
TP430 Ti
TP
XM-27
TP
XM-33A
18Cr-2Mo
29-4
29-4-2
26-3-3
25-4-4
...
. . .
. . .
. . .
. . .
TP468
UNS
Designation
S43035
S43932
S41500B
S43036
S44627
S44626
S44400
S44700
S44800
S44660
S44635
S44735
S32803
S40977
S43940
S42035
S46800
Element
Composition, %
C, max
0.07
0.030
0.05
0.10
0.01A
0.06
0.025
0.010
0.010
0.030
0.025
0.030
0.015C
0.03
0.03
0.08
0.030
Mn, max
1.00
1.00
0.5–1.0
1.00
0.40
0.75
1.00
0.30
0.30
1.00
1.00
1.00
0.5
1.50
1.00
1.00
1.00
P, max
0.040
0.040
0.03
0.040
0.02
0.040
0.040
0.025
0.025
0.040
0.040
0.040
0.020
0.040
0.040
0.045
0.040
S, max
0.030
0.030
0.03
0.030
0.02
0.020
0.030
0.020
0.020
0.030
0.030
0.030
0.005
0.015
0.015
0.030
0.030
Si, max
1.00
1.00
0.60
1.00
0.40
0.75
1.00
0.20
0.20
1.00
0.75
1.00
0.50
1.00
1.00
1.00
1.00
Ni
0.50 max
0.50
3.5–5.5
0.75 max
0.5D max
0.50 max
1.00 max
0.15 max
2.0–2.5
1.0–3.50
3.5–4.5
1.00 max
3.0–4.0
0.30–1.00
. . .
1.0–2.5
0.50
Cr
17.00–
17.0–19.0
11.5–14.0
16.00–
25.0–27.5
25.0–27.0
17.5–19.5
28.0–30.0
28.0–30.0
25.0–28.0
24.5–26.0
28.00–
28.0–
29.0
10.50–
12.50
17.50–
18.50
13.5–
15.5
18.00–
20.00
19.00
19.50
30.00
Mo
...
...
0.5–1.0
...
0.75–1.50
0.75–1.50
1.75–2.50
3.5–4.2
3.5–4.2
3.0–4.0
3.5–4.5
3.60–4.20
1.8–2.5
. . .
. . .
0.2–1.2
. . .
Al, max
0.15
0.15
. . .
...
...
...
...
...
...
...
...
...
. . .
. . .
. . .
. . .
. . .
Cu, max
...
...
. . .
...
0.2
0.20
...
0.15
0.15
...
...
...
. . .
. . .
. . .
. . .
. . .
N, max
0.04
0.030
. . .
...
0.015
0.040
0.035
0.020E
0.020E
0.040
0.035
0.045
0.020
0.030
. . . ...
General Information
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: A268/A268M − 24
Standard Specification for
Seamless and Welded Ferritic and Martensitic Stainless
1
Steel Tubing for General Service
This standard is issued under the fixed designation A268/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 U.S. Department of Defense.
1. Scope* 2. Referenced Documents
3
2
2.1 ASTM Standards:
1.1 This specification covers a number of grades of
A480/A480M Specification for General Requirements for
nominal-wall-thickness, stainless steel tubing for general
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
corrosion-resisting and high-temperature service. Most of these
Sheet, and Strip
grades are commonly known as the “straight-chromium” types
A763 Practices for Detecting Susceptibility to Intergranular
and are characterized by being ferromagnetic. Two of these
Attack in Ferritic Stainless Steels
grades, TP410 and UNS S 41500 (Table 1), are amenable to
A1016/A1016M Specification for General Requirements for
hardening by heat treatment, and the high-chromium, ferritic
Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless
alloys are sensitive to notch-brittleness on slow cooling to
Steel Tubes
ordinary temperatures. These features should be recognized in
E213 Practice for Ultrasonic Testing of Metal Pipe and
the use of these materials.
Tubing
1.2 An optional supplementary requirement is provided, and E273 Practice for Ultrasonic Testing of the Weld Zone of
Welded Pipe and Tubing
when desired, shall be so stated in the order.
1.3 The values stated in either inch-pound units or SI units
3. Terminology
are to be regarded separately as standard. Within the text, the
3.1 Lot Definitions:
SI units are shown in brackets. The values stated in each
3.1.1 For flange and flaring requirements, the term lot
system may not be exact equivalents; therefore, each system
applies to all tubes, prior to cutting, of the same nominal size
shall be used independently of the other. Combining values
and wall thickness that are produced from the same heat of
from the two systems may result in non-conformance with the
steel. If final heat treatment is in a batch-type furnace, a lot
standard. The inch-pound units shall apply unless the “M”
shall include only those tubes of the same size and from the
designation of this specification is specified in the order.
same heat that are heat treated in the same furnace charge. If
the final heat treatment is in a continuous furnace, the number
1.4 This international standard was developed in accor-
of tubes of the same size and from the same heat in a lot shall
dance with internationally recognized principles on standard-
be determined from the size of the tubes as given in Table 2.
ization established in the Decision on Principles for the
3.1.2 For tensile and hardness test requirements, the term lot
Development of International Standards, Guides and Recom-
applies to all tubes, prior to cutting, of the same nominal
mendations issued by the World Trade Organization Technical
diameter and wall thickness that are produced from the same
Barriers to Trade (TBT) Committee.
heat of steel. If final heat treatment is in a batch-type furnace,
a lot shall include only those tubes of the same size and the
same heat that are heat treated in the same furnace charge. If
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
the final heat treatment is in a continuous furnace, a lot shall
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.10 on Stainless and Alloy Steel Tubular Products.
Current edition approved March 1, 2024. Published March 2024. Originally
3
approved in 1944. Last previous edition approved in 2022 as A268/A268M – 22. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
DOI: 10.1520/A0268_A0268M-24. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
2
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
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A268/A268M − 24
2
TABLE 1 Che
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A268/A268M − 22 A268/A268M − 24
Standard Specification for
Seamless and Welded Ferritic and Martensitic Stainless
1
Steel Tubing for General Service
This standard is issued under the fixed designation A268/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 U.S. Department of Defense.
1. Scope*
2
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.
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 may not be exact equivalents; therefore, each system shall be used
independently of the other. Combining values from the two systems may result in non-conformance with the standard. The
inch-pound units shall apply unless the “M” designation of this specification is specified in the order.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
3
2.1 ASTM Standards:
A480/A480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip
A763 Practices for Detecting Susceptibility to Intergranular Attack in Ferritic Stainless Steels
A1016/A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel
Tubes
E213 Practice for Ultrasonic Testing of Metal Pipe and Tubing
E273 Practice for Ultrasonic Testing of the Weld Zone of Welded Pipe and Tubing
1
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.
Current edition approved May 1, 2022March 1, 2024. Published June 2022March 2024. Originally approved in 1944. Last previous edition approved in 20202022 as
A268/A268M – 20.A268/A268M – 22. DOI: 10.1520/A0268_A0268M-22.10.1520/A0268_A0268M-24.
2
For ASME Boiler and Pressure Vessel Code applications see related Specification SA-268 in Section II of that Code.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 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.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A268/A268M − 24
2
TABLE 1 Chemical Requirements
A
Grade TP405 TP410 TP429 TP430 TP443 TP446–1 TP446–2 . . . TP409
UNS
Designation S40500 S41000 S42900 S43000 S44300 S44600 S44600 S40800 S40900
Element Composition, %
C, max 0.08 0.15 0.12 0.12 0.20 0.20 0.12 0.08 0.08
Mn, max 1.00 1.00 1.00 1.00 1.00 1.50 1.50 1.00 1.00
P, max 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.045 0.045
S, max 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.045 0.030
Si, max 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
Ni 0.50 max . . . . . . . . . 0.75 max 0.75 max 0.50 max 0.80 max 0.50 max
Cr 11.5–14.5 11.5–13.5 14.0–16.0 16.0–18.0 18.0–23.0 23.0–27.0 23.0–27.0 11.5–13.0 10.5–11.7
Mo . . . . . . . . . . . . . . . . . . . . . . . . . . .
Al 0.10–0.30 . . . . . . . . . . . . . . . . . . . . . . . .
Cu . . . . . . . . . . . . 0.90–1.25 . . . . . . . . . . . .
N . . . . . . . . .
...
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