ASTM A242/A242M-24
(Specification)Standard Specification for High-Strength Low-Alloy Structural Steel
Standard Specification for High-Strength Low-Alloy Structural Steel
ABSTRACT
This specification covers high-strength low-alloy structural steel shapes, plates, and bars for welded, riveted, or bolted construction intended primarily for use as structural members where savings in weight (mass) or added durability are important. Steel specimens shall be semi-killed or killed. Heat analysis shall be performed wherein steel specimens shall conform to required chemical compositions of carbon, manganese, phosphorus, sulfur, and copper. Atmospheric corrosion resistance shall be estimated for steel specimens. Specimens shall also undergo tension tests and shall conform to specified values of tensile strength, yield point, and elongation.
SCOPE
1.1 This specification covers high-strength low-alloy structural steel shapes, plates, and bars for welded, riveted, or bolted construction intended primarily for use as structural members where savings in weight [mass] or added durability are important. The atmospheric corrosion resistance of the steel in most environments is substantially better than that of carbon structural steels with or without copper addition. When properly exposed to the atmosphere, this steel can be used bare (unpainted) for many applications (see Note 1). This specification is limited to material up to 4 in. [100 mm], inclusive, in thickness.
Note 1: For methods of estimating the atmospheric corrosion resistance of low-alloy steels, see Guide G101.
1.2 When the steel is to be welded, it is presupposed that a welding procedure suitable for the grade of steel and intended use or service will be utilized. See Appendix X3 of Specification A6/A6M for information on weldability.
1.3 The values stated in either inch-pound units or SI units are to be regarded 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. Combining values from the two systems may result in nonconformance with the specification.
1.4 For structural products produced from coil and furnished without heat treatment or with stress relieving only, the additional requirements, including additional testing requirements and the reporting of additional test results, of Specification A6/A6M apply.
1.5 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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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.
Designation: A242/A242M − 24 American Association State
Highway and Transportation Officials
Standard AASHTO No.: M 161
Standard Specification for
1
High-Strength Low-Alloy Structural Steel
This standard is issued under the fixed designation A242/A242M; 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 mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This specification covers high-strength low-alloy struc-
tural steel shapes, plates, and bars for welded, riveted, or bolted
2. Referenced Documents
construction intended primarily for use as structural members
2
where savings in weight [mass] or added durability are 2.1 ASTM Standards:
important. The atmospheric corrosion resistance of the steel in A6/A6M Specification for General Requirements for Rolled
most environments is substantially better than that of carbon Structural Steel Bars, Plates, Shapes, and Sheet Piling
structural steels with or without copper addition. When prop- G101 Guide for Estimating the Atmospheric Corrosion Re-
erly exposed to the atmosphere, this steel can be used bare sistance of Low-Alloy Steels
(unpainted) for many applications (see Note 1). This specifi-
cation is limited to material up to 4 in. [100 mm], inclusive, in 3. General Requirements for Delivery
thickness.
3.1 Structural products furnished under this specification
shall conform to the requirements of the current edition of
NOTE 1—For methods of estimating the atmospheric corrosion resis-
tance of low-alloy steels, see Guide G101.
Specification A6/A6M, for the specific structural product
ordered, unless a conflict exists, in which case this specification
1.2 When the steel is to be welded, it is presupposed that a
shall prevail.
welding procedure suitable for the grade of steel and intended
use or service will be utilized. See Appendix X3 of Specifica-
3.2 Coils are excluded from qualification to this specifica-
tion A6/A6M for information on weldability.
tion until they are processed into a finished structural product.
Structural products produced from coil means structural prod-
1.3 The values stated in either inch-pound units or SI units
ucts that have been cut to individual lengths from a coil. The
are to be regarded as standard. Within the text, the SI units are
processor directly controls, or is responsible for, the operations
shown in brackets. The values stated in each system are not
involved in the processing of a coil into a finished structural
exact equivalents; therefore, each system must be used inde-
product. Such operations include decoiling, leveling or
pendently of the other. Combining values from the two systems
straightening, hot-forming or cold-forming (if applicable),
may result in nonconformance with the specification.
cutting to length, testing, inspection, conditioning, heat treat-
1.4 For structural products produced from coil and fur-
ment (if applicable), packaging, marking, loading for shipment,
nished without heat treatment or with stress relieving only, the
and certification.
additional requirements, including additional testing require-
NOTE 2—For structural products produced from coil and furnished
ments and the reporting of additional test results, of Specifi-
without heat treatment or with stress relieving only, two test results are to
cation A6/A6M apply.
be reported for each qualifying coil. Additional requirements regarding
1.5 This international standard was developed in accor-
structural products produced from coil are described in Specification
dance with internationally recognized principles on standard- A6/A6M.
ization established in the Decision on Principles for the
4. Materials and Manufacture
Development of International Standards, Guides and Recom-
4.1 The steel shall be killed.
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
2
A01.02 on Structural Steel for Bridges, Buildings, Rolling Stock and Ships. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved March 1, 2024. Published March 2024. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1941. Last previous edition approved in 2018 as A242/A242M – 13 Standards volume information, refer
...
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: A242/A242M − 13 (Reapproved 2018) A242/A242M − 24 American Association State
Highway and Transportation Officials
Standard AASHTO No.: M 161
Standard Specification for
1
High-Strength Low-Alloy Structural Steel
This standard is issued under the fixed designation A242/A242M; 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
1.1 This specification covers high-strength low-alloy structural steel shapes, plates, and bars for welded, riveted, or bolted
construction intended primarily for use as structural members where savings in weight [mass] or added durability are important.
The atmospheric corrosion resistance of the steel in most environments is substantially better than that of carbon structural steels
with or without copper addition. When properly exposed to the atmosphere, this steel can be used bare (unpainted) for many
applications (see Note 1). This specification is limited to material up to 4 in. [100 mm], inclusive, in thickness.
NOTE 1—For methods of estimating the atmospheric corrosion resistance of low-alloy steels, see Guide G101.
1.2 When the steel is to be welded, it is presupposed that a welding procedure suitable for the grade of steel and intended use or
service will be utilized. See Appendix X3 of Specification A6/A6M for information on weldability.
1.3 The values stated in either inch-pound units or SI units are to be regarded 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. Combining values from the two systems may result in nonconformance with the specification.
1.4 For structural products produced from coil and furnished without heat treatment or with stress relieving only, the additional
requirements, including additional testing requirements and the reporting of additional test results, of Specification A6/A6M apply.
1.5 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
2.1 ASTM Standards:
A6/A6M Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling
G101 Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels
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 A01.02
on Structural Steel for Bridges, Buildings, Rolling Stock and Ships.
Current edition approved March 1, 2018March 1, 2024. Published March 2018March 2024. Originally approved in 1941. Last previous edition approved in 20132018 as
A242/A242M – 13. DOI: 10.1520/A0242_A0242M-13R18.13 (2018). DOI: 10.1520/A0242_A0242M-24.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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A242/A242M − 24
3. General Requirements for Delivery
3.1 Structural products furnished under this specification shall conform to the requirements of the current edition of Specification
A6/A6M, for the specific structural product ordered, unless a conflict exists, in which case this specification shall prevail.
3.2 Coils are excluded from qualification to this specification until they are processed into a finished structural product. Structural
products produced from coil means structural products that have been cut to individual lengths from a coil. The processor directly
controls, or is responsible for, the operations involved in the processing of a coil into a finished structural product. Such operations
include decoiling, leveling or straightening, hot-forming or cold-forming (if applicable), cutting to length,
...
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