ASTM A420/A420M-16
(Specification)Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service
Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service
ABSTRACT
This specification covers wrought carbon steel and alloy steel pipe fittings of seamless and welded construction for use in pressure piping and pressure vessel service at low temperatures. Materials shall consist of forgings, bars, plates, seamless or fusion welded tubular products with filler metal added, and shall be produced by open-hearth, basic-oxygen, or electric-furnace process. Forging or forming operations shall be performed by one or a combination of two or more of the following procedures: hammering, pressing, piercing, extruding, upsetting, working, bending, fusion-welding, or machining. All welding shall be completed prior to the austenitizing heat treatment, which shall be executed in the normalized, normalized and tempered, annealed, or quenched and tempered conditions. Steel specimens shall conform to required values of chemical composition, tensile strength, yield strength, elongation, wall thickness, and Charpy V-notch impact value. All fusion-welded butt joints shall undergo radiographic examination, while hydrostatic testing of fittings is not required in this specification. Repair welding shall be permissible for parts made to dimensional standards.
SCOPE
1.1 This specification2 covers wrought carbon steel and alloy steel fittings of seamless and welded construction, covered by the latest revision of ASME B16.9, ASME B16.11, MSS SP-79, MSS SP-83, MSS SP-95, and MSS SP-97. Fittings differing from these ASME and MSS standards shall be furnished in accordance with Supplementary Requirement S58 of Specification A960/A960M. These fittings are for use in pressure piping and pressure vessel service at low temperatures.
1.2 Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. When desired, one or more of these supplementary requirements shall be specified in the order.
1.3 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.
1.4 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.
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Designation:A420/A420M −16
Standard Specification for
Piping Fittings of Wrought Carbon Steel and Alloy Steel for
1
Low-Temperature Service
This standard is issued under the fixed designationA420/A420M; 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.
3
1. Scope* 2.2 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing
2
1.1 This specification covers wrought carbon steel and
of Steel Products
alloy steel fittings of seamless and welded construction, cov-
A960/A960M Specification for Common Requirements for
ered by the latest revision of ASME B16.9, ASME B16.11,
Wrought Steel Piping Fittings
MSS SP-79, MSS SP-83, MSS SP-95, and MSS SP-97.
A1058 Test Methods for Mechanical Testing of Steel
Fittings differing from these ASME and MSS standards shall
Products—Metric
be furnished in accordance with Supplementary Requirement
2.3 ASME Standards:
S58ofSpecificationA960/A960M.Thesefittingsareforusein 4
B 16.9 Factory-Made Wrought Steel Butt-Welding Fittings
4
pressure piping and pressure vessel service at low tempera-
B 16.11 Forged Steel Fittings, Socket-Welding Threaded
4
tures.
Section VIII Division 1, Pressure Vessels
Section IX
1.2 Optional supplementary requirements are provided for
2.4 MSS Standards:
fittings where a greater degree of examination is desired.When
MSS SP-25 Standard Marking System for Valves, Fittings,
desired,oneormoreofthesesupplementaryrequirementsshall
5
Flanges, and Unions
be specified in the order.
5
MSS SP-79 Socket Welding Reducer Inserts
1.3 This specification is expressed in both inch-pound units
MSS SP-83 Steel Pipe Unions, Socket-Welding and
5
and in SI units. However, unless the order specifies the Threaded
5
applicable “M” specification designation (SI units), the mate-
MSS SP-95 Swage(d) Nipples and Bull Plugs
rial shall be furnished to inch-pound units. MSS SP-97 Integrally Reinforced Forged Branch Outlet
Fittings—Socket Welding, Threaded and Buttwelding
1.4 The values stated in either SI units or inch-pound units
Ends
are to be regarded separately as standard. Within the text, the
2.5 ASNT Standards:
SI units are shown in brackets. The values stated in each
SNT-TC-1A Recommended Practice for Nondestructive
system may not be exact equivalents; therefore, each system 6
Testing Personnel Qualification and Certification
shall be used independently of the other. Combining values
from the two systems may result in non-conformance with the
3. Ordering Information
standard.
3.1 See Specification A960/A960M.
2. Referenced Documents 4. General Requirements
4.1 Product furnished to this specification shall conform to
2.1 In addition to those Referenced Documents listed in
the requirements of Specification A960/A960M, including any
Specification A960/A960M, the following list of standards
apply to this specification.
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
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel, the ASTM website.
4
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee Available from American Society of Mechanical Engineers (ASME), ASME
A01.22 on Steel Forgings and Wrought Fittings for PipingApplications and Bolting International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
Materials for Piping and Special Purpose Applications. www.asme.org.
5
Current edition approved May 1, 2016. Published May 2016. Originally AvailablefromManufacturersStandardizationSocietyoftheValveandFittings
approved in 1958. Last previous edition approved in 2014 as A420/A420M – 14. Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-
DOI: 10.1520/A0420_A0420M-16. hq.com.
2
6
For ASME Boiler and Pressure Vessel Code applications see related Specifi- AvailablefromAmericanSocietyforNondestructiveTesting(ASNT),P.O.Box
cation SA-420 in Section II of that Code. 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.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
---------------------- Page: 1 ----------------------
A420/A420M−16
supplementary requirements that are indicated in the purchase wall areas of the tee need be examined. This area is defined by
order. Failure to comply with the general requirements of a circle that covers the area from the weld bevel of the branch
Spe
...
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: A420/A420M − 14 A420/A420M − 16
Standard Specification for
Piping Fittings of Wrought Carbon Steel and Alloy Steel for
1
Low-Temperature Service
This standard is issued under the fixed designation A420/A420M; 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*
2
1.1 This specification covers wrought carbon steel and alloy steel fittings of seamless and welded construction, covered by the
latest revision of ASME B16.9, ASME B16.11, MSS SP-79, MSS SP-83, MSS SP-95, and MSS SP-97. Fittings differing from
these ASME and MSS standards shall be furnished in accordance with Supplementary Requirement S58 of Specification
A960/A960M. These fittings are for use in pressure piping and pressure vessel service at low temperatures.
1.2 Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. When
desired, one or more of these supplementary requirements shall be specified in the order.
1.3 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.
1.4 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.
2. Referenced Documents
2.1 In addition to those Referenced Documents listed in Specification A960/A960M, the following list of standards apply to this
specification.
3
2.2 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A960/A960M Specification for Common Requirements for Wrought Steel Piping Fittings
A1058 Test Methods for Mechanical Testing of Steel Products—Metric
2.3 ASME Standards:
4
B 16.9 Factory-Made Wrought Steel Butt-Welding Fittings
4
B 16.11 Forged Steel Fittings, Socket-Welding Threaded
4
Section VIII Division 1, Pressure Vessels
Section IX
2.4 MSS Standards:
5
MSS SP-25 Standard Marking System for Valves, Fittings, Flanges, and Unions
5
MSS SP-79 Socket Welding Reducer Inserts
5
MSS SP-83 Steel Pipe Unions, Socket-Welding and Threaded
5
MSS SP-95 Swage(d) Nipples and Bull Plugs
MSS SP-97 Integrally Reinforced Forged Branch Outlet Fittings—Socket Welding, Threaded and Buttwelding Ends
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 Oct. 1, 2014May 1, 2016. Published October 2014May 2016. Originally approved in 1958. Last previous edition approved in 20132014 as
A420/A420MA420/A420M – 14.–13. DOI: 10.1520/A0420_A0420M-14.10.1520/A0420_A0420M-16.
2
For ASME Boiler and Pressure Vessel Code applications see related Specification SA-420 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.
5
Available from Manufacturers Standardization Society of the Valve and Fittings Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-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
---------------------- Page: 1 ----------------------
A420/A420M − 16
2.5 ASNT Standards:
6
SNT-TC-1A Recommended Practice for Nondestructive Testing Personnel Qualification and Certification
3. Ordering Information
3.1 See Specification A960/A960M.
4. General Requirements
4.1 Product furnished to this specification shall conform to the requirements of Specification A960/A960M, including any
supple
...
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