ASTM A632-19

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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: A632 − 04 (Reapproved 2014) A632 − 19
Standard Specification for
Seamless and Welded Austenitic Stainless Steel Tubing
(Small-Diameter) for General Service
This standard is issued under the fixed designation A632; 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.
1. Scope Scope*
1.1 This specification covers grades of stainless steel tubing in sizes under ⁄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 standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
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
2.1 ASTM Standards:
A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
A380A380/A380M Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems
A1016/A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel
Tubes
E165E165/E165M Practice for Liquid Penetrant Testing for General Industry
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
2.2 SAE Standard:
SAE J 1086 Practice for Numbering Metals and Alloys (UNS)
3. Ordering Information
3.1 Orders for product under this specification should include 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),
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 Oct. 1, 2014Sept. 1, 2019. Published October 2014September 2019. Originally approved in 1969. Last previous edition approved in 20092014
as A632A632 – 04 (2014). – 04 (2009). DOI: 10.1520/A0632-04R14.DOI: 10.1520/A0632-19.
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.
Available from SAE International (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http://www.sae.org.
*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
A632 − 19
B
TABLE 1 Chemical Requirements
Composition, %
Grade TP 304 TP 304L TP 310 TP 316 TP 316L TP 317 TP 321 TP 347 TP 348
Element
UNS
S30400 S30403 S31000 S31600 S31603 S31700 S32100 S34700 S34800
A
Designation
Carbon, max 0.08 0.030 0.15 0.08 0.030 0.08 0.08 0.08 0.08
Carbon, max 0.08 0.030 0.25 0.08 0.030 0.08 0.08 0.08 0.08
Manganese max 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00
Phosphorus, max 0.045 0.045 0.045 0.045 0.045 0.045 0.045 0.045 0.045
Sulfur, max 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030
B
Silicon, max 0.75 0.75 0.75 0.75 0.75 0.75 0.75 0.75 0.75
Silicon, max 1.00 1.00 1.50 1.00 1.00 1.00 1.00 1.00 1.00
C
Nickel 8.0–11.0 8.0–13.0 19.0–22.0 11.0–14.0 10.0–15.0 11.0–14.0 9.0–13.0 9.0–13.0 9.0–13.0
Nickel 8.0–11.0 8.0–12.0 19.0–22.0 10.0–14.0 10.0–14.0 11.0–15.0 9.0–12.0 9.0–13.0 9.0–13.0
Chromium 18.0–20.0 18.0–20.0 24.0–26.0 16.0–18.0 16.0–18.0 18.0–20.0 17.0–20.0 17.0–20.0 17.0–20.0
Chromium 18.0–20.0 18.0–20.0 24.0–26.0 16.0–18.0 16.0–18.0 18.0–20.0 17.0–19.0 17.0–19.0 17.0–19.0
Molybdenum . . . 2.00–3.00 2.00–3.00 3.00–4.00 . . .
Molybdenum . . . 2.00–3.00 2.00–3.00 3.0–4.0 . . .
D
Titanium . . . . . . . .
C
Titanium . . . . . . . .
E E
Columbium + tantalum . . . . . . .
F D E
Niobium + tantalum . . . . . . .
Tantalum, max . . . . . . . . 0.10
Other Elements . . . . . . . . Co 0.20
A
New designation established in accordance with Practice E527 and SAE J 1086, Practice for Numbering Metals and Alloys (UNS).
B
For seamless TP316L tubes, the silicon maximum shall be 1.00 %. Maximum, unless otherwise indicated. Where ellipses (.) appear in this table, there are no
requirements and analysis for the element need not be determined or reported.
C
For welded TP 316 tubes, the nickel range shall be 10.0–14.0 %.
C
Grade TP 321 shall have a titanium content of not less than five times the carbon content plus nitrogen and not more than 0.60 %. 0.70 %.
D
Grade TP 347 shall have a niobium content of not less than ten times the carbon content and not more than 1.10 %.
E
Grades TP 347 and Grade TP 348 shall have a columbiumniobium plus tantalum content of not less than ten times the carbon content and not more than 1.0 %.1.10 %.
F
The terms Columbium (Cb) and Niobium (Nb) both refer to the same element.
3.1.7 Test report required,
3.1.8 Specification designation, and
3.1.9 Special requirements or any supplementary requirements selected, or both.
4. General Requirements
4.1 Tubing furnished under this specification shall conform to the applicable requirements of the current edition of Specification
E165A1016/A1016M, 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)1900°F (1040°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.
7. Product Analysis
7.1 When specified on the purchase order, an analysis of either one billet or one length of flat-rolled stock or one tube shall be
made from each heat. The chemical composition thus determined shall conform to the specified requirements.
7.2 If the analysis made in accordance with 7.1 does not conform to the specified requirements, an analysis of each billet or
length of flat-rolled stock or tube from the same heat may be made and all billets, stock, or tubes thus conforming to the
requirements shall be accepted so far as chemical composition is concerned.
8. Mechanical Properties
8.1 Tensile Requirements—The material shall conform to the requirements as to tensile properties specified in Table 2. These
mechanical properties apply to tubing ⁄8 in. (3.2 mm) and larger in outside diameter by 0.015 in. (0.38 mm) in wall thickness and
heavier. Smaller sizes are available meeting the minimum tensile strength specified in Table 2; however, yield strength is not
generally determined on such sizes, and the minimum elongation shall be 25 %.
A632 − 19
TABLE 2 Tensile Requirements
A A
Tensile strength, min, ksi (MPa) 75 (515)
A,B A,B
Yield strength, min, ksi (MPa) 30 (205)
B
Elongation in 2 in. or 50 mm, min, % 35
A
Grades TP 304L and TP 316L shall have a minimum tensile strength of 70 ksi
(485 MPa) and a minimum yield strength of 25 ksi (170 MPa).
B
Yield strength is not generally determined on tubing sizes smaller than ⁄8 in. (3.2
mm) in outside diameter or thinner than 0.015 in. (0.38 mm) wall, so yield strength
is not required on such sizes.
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