Designation: A 632 – 04
Standard Specification for
Seamless and Welded Austenitic Stainless Steel Tubing
(Small-Diameter) for General Service
1
This standard is issued under the fixed designation A 632; 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.
1. Scope*
1.1 This specification covers grades of stainless steel tubing
in sizes under
1
⁄
2
down to 0.050 in. (12.7 to 1.27 mm) in outside
diameter and wall thicknesses less than 0.065 in. down to 0.005
in. (1.65 to 0.13 mm) for general corrosion-resisting and low-
or high-temperature service, as designated in Table 1.
NOTE 1—The grades of austenitic stainless steel tubing furnished in
accordance with this specification have been found suitable for low-
temperature service down to −325°F (−200°C) in which Charpy notched-
bar impact values of 15 ft·lbf (20 J), minimum, are required and these
grades need not be impact tested.
1.2 Optional supplementary requirements are provided and,
when desired, shall be so stated in the order.
1.3 The values stated in inch-pound units are to be regarded
as the standard.
2. Referenced Documents
2.1 ASTM Standards:
2
A 262 Practices for Detecting Susceptibility to Intergranu-
lar Attack in Austenitic Stainless Steels
A 380 Practice for Cleaning, Descaling, and Passivation of
Stainless Steel Parts, Equipment, and Systems
A 1016/A 1016M Specification for General Requirements
for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stain-
less Steel Tubes
E 165 Test Method for Liquid Penetrant Examination
E 527 Practice for Numbering Metals and Alloys (UNS)
2.2 SAE Standard:
SAE J 1086 Practice for Numbering Metals and Alloys
(UNS)
3
3. Ordering Information
3.1 Orders for product under this specification should in-
clude the following, as required, to describe the desired
material adequately:
3.1.1 Quantity (feet or number of lengths),
3.1.2 Name of product (seamless or welded tubes),
3.1.3 Grade (see Table 1),
3.1.4 Size (only two of the following: outside diameter,
inside diameter, and average wall),
3.1.5 Length (specific or random),
3.1.6 Optional requirements (check analysis, see Section 7;
hydrostatic, air underwater pressure test, or nondestructive
electric test, see Section 13),
3.1.7 Test report required,
3.1.8 Specification designation, and
3.1.9 Special requirements or any supplementary require-
ments selected, or both.
4. General Requirements
4.1 Tubing furnished under this specification shall conform
to the applicable requirements of the current edition of Speci-
fication A 1016/A 1016M, unless otherwise provided herein.
5. Manufacture
5.1 Manufacture—The tubes shall be cold finished and shall
be made by the seamless or welded process.
5.2 Heat Treatment—All material shall be furnished in the
heat-treated condition. The heat-treatment procedure shall
consist of heating the material to a minimum temperature of
1800°F (980°C) and quenching in water or rapidly cooling by
other means.
6. Chemical Composition
6.1 The steel shall conform to the requirements as to
chemical composition as specified in Table 1.
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 March 1, 2004. Published March 2004. Originally
approved in 1969. Last previous edition approved in 2002 as A 632 – 02a.
2
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.
3
Available from Society of Automotive Engineers (SAE), 400 Commonwealth
Dr., Warrendale, PA 15096-0001.
1
*A Summary of Changes section appears at the end of this standard.
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