ASTM A420/A420M-01
(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
SCOPE
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, ASME B16.28, MSS-SP-79, and MSS SP-95. Fittings differing from these ASME and MSSVF standards shall be furnished in accordance with Supplementary Requirement S6. 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 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 are not exact equivalents; therefore, each system must be used independently of the other.
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An American National Standard
Designation: A 420/A 420M – 01
Standard Specification for
Piping Fittings of Wrought Carbon Steel and Alloy Steel for
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Low-Temperature Service
This standard is issued under the fixed designation A 420/A 420M; 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.
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1. Scope Wrought Steel Piping Fittings
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2.3 ASME Standards:
1.1 This specification covers wrought carbon steel and
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B 16.9 Factory-Made Wrought Steel Butt-Welding Fittings
alloy steel fittings of seamless and welded construction, cov-
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B 16.11 Forged Steel Fittings, Socket-Welding Threaded
ered by the latest revision of ASME B16.9, ASME B16.11,
B 16.28 Wrought Steel Butt-Welding Short Radius Elbows
ASME B16.28, MSS-SP-79, and MSS SP-95. Fittings differing
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and Returns
from these ASME and MSSVF standards shall be furnished in
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Section VIII Division 1, Pressure Vessels
accordance with Supplementary Requirement S58 of Specifi-
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Section V Nondestructive Examination
cation A 960. These fittings are for use in pressure piping and
2.4 MSS Standards:
pressure vessel service at low temperatures.
MSS SP-25 Standard Marking System for Valves, Fittings,
1.2 Optional supplementary requirements are provided for
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Flanges, and Unions
fittings where a greater degree of examination is desired. When
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MSS SP-79 Socket Welding Reducer Inserts
desired, one or more of these supplementary requirements shall
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MSS SP-95 Swage(d) Nipples and Bull Plugs
be specified in the order.
2.5 ASNT Standards:
1.3 This specification is expressed in both inch-pound units
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ASNT (1984) Recommended Practice No. SNT-TC-1A
and in SI units. However, unless the order specifies the
applicable “M” specification designation (SI units), the mate-
3. Ordering Information
rial shall be furnished to inch-pound units.
3.1 See specification A 960.
1.4 The values stated in either inch-pound units or SI units
are to be regarded separately as standard. Within the text, the
4. General Requirements
SI units are shown in brackets. The values stated in each
4.1 Product furnished to this specification shall conform to
system are not exact equivalents; therefore, each system must
the requirements of Specification A 960, including any supple-
be used independently of the other.
mentary requirements that are indicated in the purchase order.
2. Referenced Documents Failure to comply with the general requirements of Specifica-
tion A 960 constitutes non-conformance with this specification.
2.1 In addition to those Referenced Documents listed in
In case of conflict between the requirements of this specifica-
Specification A 960, the following list of standards apply to
tion and Specification A 960, this specification shall prevail.
this specification.
2.2 ASTM Standards:
5. Material
A 370 Test Methods and Definitions for Mechanical Testing
3 5.1 The material for fittings shall consist of forgings, bars,
of Steel Products
plates, seamless or fusion welded tubular products with filler
A 960 Specification for Common Requirements for
metal added. It shall conform to the chemical requirements in
Table 1, and be made by one of the following processes:
open-hearth, basic-oxygen, or electric-furnace. The steels shall
1 be made using recognized melting practices necessary to
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
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Materials For Piping and Special Purpose Applications. Annual Book of ASTM Standards, Vol 01.01.
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Current edition approved Sept. 10, 2001. Published December 2001. Originally Available from ASME International, Three Park Avenue, New York, NY
published as A 420 – 58 T. Last previous edition A 420/A 420M – 00b. 10016-5990.
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The year date of this specification was corrected editorially in January 1998. Available from Manufacturers’ Standardization Society of the Valve and
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For ASME Boiler and Pressure Vessel Code applications see related Specifi-
Fittings Industry, 127 Park St. N.E., Vienna, VA 22180.
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cation SA-420 in Section II of that Code.
Available from American Society for Nondestructive Testing, 1711 Arlingate
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Annual Book of ASTM Standards, Vol 01.03. Plaza, Columbus, OH 43228–0518.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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A 420/A 420M
TABLE 1 Chemical Requirements
NOTE 1—All requirements are maximum unless otherwise indicated.
NOTE 2—Where an ellips
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