ASTM A242/A242M-04
(Specification)Standard Specification for High-Strength Low-Alloy Structural Steel
Standard Specification for High-Strength Low-Alloy Structural Steel
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 0). This specification is limited to material up to 4 in. [100 mm], inclusive, in thickness. Note 0For methods of estimating the atmospheric corrosion resistance of low-alloy steels, see Guide G 101.
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 A 6/A 6M 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 A 6/A 6M apply.
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Standards Content (Sample)
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American Association State
Designation: A 242/A 242M – 04 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 designationA242/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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* A 6/A 6M Specification for General Requirements for
Rolled Structural Steel Bars, Plates, Shapes, and Sheet
1.1 This specification covers high-strength low-alloy struc-
Piling
turalsteelshapes,plates,andbarsforwelded,riveted,orbolted
G 101 Guide for Estimating the Atmospheric Corrosion
construction intended primarily for use as structural members
Resistance of Low-Alloy Steels
where savings in weight [mass] or added durability are
important. The atmospheric corrosion resistance of the steel in
3. General Requirements for Delivery
most environments is substantially better than that of carbon
3.1 Structural products furnished under this specification
structural steels with or without copper addition. When prop-
shall conform to the requirements of the current edition of
erly exposed to the atmosphere, this steel can be used bare
Specification A 6/A 6M, for the specific structural product
(unpainted) for many applications (see Note 1). This specifi-
ordered,unlessaconflictexists,inwhichcasethisspecification
cation is limited to material up to 4 in. [100 mm], inclusive, in
shall prevail.
thickness.
3.2 Coils are excluded from qualification to this specifica-
NOTE 1—For methods of estimating the atmospheric corrosion resis-
tion until they are processed into a finished structural product.
tance of low-alloy steels, see Guide G 101.
Structural products produced from coil means structural prod-
1.2 When the steel is to be welded, it is presupposed that a
ucts that have been cut to individual lengths from a coil. The
welding procedure suitable for the grade of steel and intended
processor directly controls, or is responsible for, the operations
use or service will be utilized. See Appendix X3 of Specifica-
involved in the processing of a coil into a finished structural
tion A 6/A 6M for information on weldability.
product. Such operations include decoiling, leveling or
1.3 The values stated in either inch-pound units or SI units
straightening, hot-forming or cold-forming (if applicable),
are to be regarded as standard. Within the text, the SI units are
cutting to length, testing, inspection, conditioning, heat treat-
shown in brackets. The values stated in each system are not
ment(ifapplicable),packaging,marking,loadingforshipment,
exact equivalents; therefore, each system must be used inde-
and certification.
pendentlyoftheother.Combiningvaluesfromthetwosystems
NOTE 2—For structural products produced from coil and furnished
may result in nonconformance with the specification.
without heat treatment or with stress relieving only, two test results are to
1.4 For structural products produced from coil and fur-
be reported for each qualifying coil. Additional requirements regarding
nished without heat treatment or with stress relieving only, the
structural products produced from coil are described in Specification
additional requirements, including additional testing require- A 6/A 6M.
ments and the reporting of additional test results, of Specifi-
4. Materials and Manufacture
cation A 6/A 6M apply.
4.1 The steel shall be semi-killed or killed.
2. Referenced Documents
2 5. Chemical Composition
2.1 ASTM Standards:
5.1 The heat analysis shall conform to the requirements
prescribed in Table 1.
5.2 The steel shall conform on product analysis to the
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
requirements prescribed in Table 1, subject to the product
Stainless Steel, and RelatedAlloys, and is the direct responsibility of Subcommittee
analysis tolerances in Specification A 6/A 6M.
A01.02 on Structural Steel for Bridges, Buildings, Rolling Stock, and Ships.
5.3 Choice and use of alloying elements, combined with
Current edition approved April 1, 2004. Published May 2004. Originally
approved in 1941. Last previous edition approved in 2003 asA 242/A 242M – 03a.
carbon, manganese, phosphorus, sulfur, and copper within the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
limits prescribed in 5.1 to give the mechanical properties
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
prescribed in Section 6 and to provide the atmospheric corro-
Standards volume information, r
...
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