ASTM A403/A403M-18a
(Specification)Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings
Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings
ABSTRACT
This specification covers the standard for wrought austenitic stainless steel fittings for pressure piping applications. The material for fittings shall consist of forgings, bars, plates, or seamless or welded tubular products. Forging or shaping operations shall be performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending, fusion welding, machining, or by a combination of two or more of these operations. All fittings shall undergo heat-treatment. Chemical and product analyses shall be performed and shall conform to the required chemical composition in carbon, manganese, phosphorus, sulfur, silicon, chromium, molybdenum, and titanium. Tension test shall be done on the fitting material to determine the tensile properties such as yield strength and tensile strength. Fittings supplied under this specification shall be examined visually for surface discontinuities, surface checks, and mechanical marks.
SCOPE
1.1 This specification covers wrought stainless steel fittings for pressure piping applications.2
1.2 Several grades of austenitic stainless steel alloys are included in this specification Grades are designated with a prefix, WP or CR, based on the applicable ASME or MSS dimensional and rating standards, respectively.
1.3 For each of the WP stainless grades, several classes of fittings are covered, to indicate whether seamless or welded construction was utilized. Class designations are also utilized to indicate the nondestructive test method and extent of nondestructive examination (NDE). Table 1 is a general summary of the fitting classes applicable to all WP grades of stainless steel covered by this specification. There are no classes for the CR grades. Specific requirements are covered elsewhere.
1.4 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.
1.5 The values stated in either SI units or inch-pound 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.
1.6 This specification does not apply to cast steel fittings. Austenitic stainless steel castings are covered in Specifications A351/A351M, A743/A743M, and A744/A744M.
1.7 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.
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Designation:A403/A403M −18a
Standard Specification for
1
Wrought Austenitic Stainless Steel Piping Fittings
This standard is issued under the fixed designationA403/A403M; 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* ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.1 This specification covers wrought stainless steel fittings
2 mendations issued by the World Trade Organization Technical
for pressure piping applications.
Barriers to Trade (TBT) Committee.
1.2 Several grades of austenitic stainless steel alloys are
included in this specification Grades are designated with a
2. Referenced Documents
prefix, WP or CR, based on the applicable ASME or MSS
3
2.1 ASTM Standards:
dimensional and rating standards, respectively.
A351/A351M Specification for Castings, Austenitic, for
1.3 For each of the WP stainless grades, several classes of
Pressure-Containing Parts
fittings are covered, to indicate whether seamless or welded
A743/A743M Specification for Castings, Iron-Chromium,
construction was utilized. Class designations are also utilized
Iron-Chromium-Nickel, Corrosion Resistant, for General
to indicate the nondestructive test method and extent of
Application
nondestructive examination (NDE). Table 1 is a general
A744/A744M Specification for Castings, Iron-Chromium-
summary of the fitting classes applicable to all WP grades of
Nickel, Corrosion Resistant, for Severe Service
stainless steel covered by this specification. There are no
A751 Test Methods, Practices, and Terminology for Chemi-
classes for the CR grades. Specific requirements are covered
cal Analysis of Steel Products
elsewhere.
A960/A960M Specification for Common Requirements for
Wrought Steel Piping Fittings
1.4 This specification is expressed in both inch-pound units
E112 Test Methods for Determining Average Grain Size
and in SI units. However, unless the order specifies the
E165/E165M Practice for Liquid Penetrant Examination for
applicable “M” specification designation (SI units), the mate-
General Industry
rial shall be furnished to inch-pound units.
4
2.2 ASME Standards:
1.5 The values stated in either SI units or inch-pound units
ASME B16.9 Factory-Made Wrought Steel Butt-Welding
are to be regarded separately as standard. Within the text, the
Fittings
SI units are shown in brackets. The values stated in each
ASME B16.11 Forged Steel Fittings, Socket-Welding and
system may not be exact equivalents; therefore, each system
Threaded
shall be used independently of the other. Combining values
5
from the two systems may result in non-conformance with the
2.3 MSS Standards:
standard.
MSS SP-25 Standard Marking System for Valves, Fittings,
Flanges, and Unions
1.6 This specification does not apply to cast steel fittings.
MSS SP-43 Standard Practice for Light Weight Stainless
Austenitic stainless steel castings are covered in Specifications
Steel Butt-Welding Fittings
A351/A351M, A743/A743M, and A744/A744M.
MSS SP-79 Socket-Welding Reducer Inserts
1.7 This international standard was developed in accor-
dance with internationally recognized principles on standard-
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel, contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee Standards volume information, refer to the standard’s Document Summary page on
A01.22 on SteelForgingsandWroughtFittingsforPipingApplicationsandBolting the ASTM website.
4
Materials for Piping and Special Purpose Applications. Available from American Society of Mechanical Engineers (ASME), ASME
Current edition approved Sept. 1, 2018. Published September 2018. Originally International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
approved in 1956. Last previous edition approved in 2018 as A403/A403M – 18. www.asme.org.
5
DOI: 10.1520/A0403_A0403M-18A. AvailablefromManufacturersStandardizationSocietyoftheValveandFittings
2
For ASME Boiler and Pressure Vessel Code applications see related Specifi- Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-
cation SA-403 in Section II of that Code. hq.com.
*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
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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: A403/A403M − 18 A403/A403M − 18a
Standard Specification for
1
Wrought Austenitic Stainless Steel Piping Fittings
This standard is issued under the fixed designation A403/A403M; 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 wrought stainless steel fittings for pressure piping applications.
1.2 Several grades of austenitic stainless steel alloys are included in this specification Grades are designated with a prefix, WP
or CR, based on the applicable ASME or MSS dimensional and rating standards, respectively.
1.3 For each of the WP stainless grades, several classes of fittings are covered, to indicate whether seamless or welded
construction was utilized. Class designations are also utilized to indicate the nondestructive test method and extent of
nondestructive examination (NDE). Table 1 is a general summary of the fitting classes applicable to all WP grades of stainless steel
covered by this specification. There are no classes for the CR grades. Specific requirements are covered elsewhere.
1.4 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable
“M” specification designation (SI units), the material shall be furnished to inch-pound units.
1.5 The values stated in either SI units or inch-pound 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.
1.6 This specification does not apply to cast steel fittings. Austenitic stainless steel castings are covered in Specifications
A351/A351M, A743/A743M, and A744/A744M.
1.7 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:
A351/A351M Specification for Castings, Austenitic, for Pressure-Containing Parts
A743/A743M Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application
A744/A744M Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
A960/A960M Specification for Common Requirements for Wrought Steel Piping Fittings
E112 Test Methods for Determining Average Grain Size
E165/E165M Practice for Liquid Penetrant Examination for General Industry
4
2.2 ASME Standards:
ASME B16.9 Factory-Made Wrought Steel Butt-Welding Fittings
ASME B16.11 Forged Steel Fittings, Socket-Welding and Threaded
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 A01.22
on Steel Forgings and Wrought Fittings for Piping Applications and Bolting Materials for Piping and Special Purpose Applications.
Current edition approved March 1, 2018Sept. 1, 2018. Published March 2018September 2018. Originally approved in 1956. Last previous edition approved in 20162018
as A403/A403M – 16.A403/A403M – 18. DOI: 10.1520/A0403_A0403M-18.10.1520/A0403_A0403M-18A.
2
For ASME Boiler and Pressure Vessel Code applications see related Specification SA-403 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.
4
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
www.asme.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
1
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