ASTM A131/A131M-04a

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Designation: A 131/A 131M – 04a
Standard Specification for
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Structural Steel for Ships
This standard is issued under the fixed designation A 131/A 131M; 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.
1. Scope* 3. Terminology
1.1 This specification covers structural steel plates, shapes, 3.1 Definitions of Terms Specific to This Standard:
bars, and rivets intended primarily for use in ship construction. 3.1.1 control rolling, n—a steel treatment that consists of
1.2 Material under this specification is available in the final rolling within the range used for normalizing heat
following categories: treatments so that the austenite completely recrystallizes.
1.2.1 Ordinary Strength—Grades A, B, D, CS, and E with a 3.1.2 thermo-mechanical controlled processing, n—a steel
specified minimum yield point of 34 ksi [235 MPa], and treatment that consists of strict control of the steel temperature
1.2.2 Higher Strength—Grades AH, DH, EH, and FH with and the rolling reduction. A high proportion of the rolling
a specified minimum yield point of 46 ksi [315 MPa], 51 ksi reduction is to be carried out close to or below the Ar
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[350 MPa], or 57 ksi [390 MPa]. transformation temperature and may involve rolling towards
1.3 Shapes and bars are normally available as Grades A, the lower end of the temperature range of the intercritical
AH32, and AH36. Other grades may be furnished by agree- dual-phase region, thus permitting little if any recrystallization
ment between the purchaser and the manufacturer. of the austenite. The process may involve accelerated cooling
1.4 When the steel is to be welded, it is presupposed that a on completion of rolling.
welding procedure suitable for the grade of steel and intended
4. Ordering Information
use or service will be utilized. See Appendix X3 of Specifica-
4.1 Specification A 6/A 6M establishes the rules for the
tion A 6/A 6M for information on weldability.
1.5 The values stated in either inch-pound units or SI units ordering information that should be complied with when
purchasing material to this specification.
are to be regarded separately as the standard. Within the text,
the SI units are shown in brackets. The values stated in each 4.2 Additional ordering considerations specific to this speci-
fication are:
system are not exact equivalents; therefore, each system must
4.2.1 Condition (control rolled or thermo-mechanical con-
be used independently of the other. Combining values from the
two systems may result in nonconformance with this specifi- trol processed, if applicable).
cation.
5. Materials and Manufacture
2. Referenced Documents
5.1 Rimmed steels shall not be applied.
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5.2 Except for Grades A and B steel, semi-killed steels shall
2.1 ASTM Standards:
A 6/A6M Specification for General Requirements for not be applied.
5.3 Except as permitted in 5.3.1, Grades D, CS, E, AH32,
Rolled Structural Steel Bars, Plates, Shapes, and Sheet
Piling AH36, AH40, DH32, DH36, DH40, EH32, EH36, EH40,
FH32, FH36, and FH40 shall be made using a fine grain
A 370 Test Methods and Definitions for Mechanical Testing
of Steel Products practice. For ordinary-strength grades, aluminum shall be used
to obtain grain refinement. For higher-strength grades, alumi-
E 112 Test Methods for Determining Average Grain Size
num, vanadium, or columbium (niobium) may be used for
grain refinement.
5.3.1 Grade D material 1.0 in. [25 mm] and under in
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This specification is under the jurisdiction of ASTM Committee A01 on Steel,
thickness, at the option of the manufacturer, may be killed and
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
exempt from the fine austenitic grain size requirement of 7.1,
A01.02 on Structural Steel for Bridges, Buildings, Rolling Stock, and Ships.
but such material shall be subject to the toughness requirement
Current edition approved Sept. 1, 2004. Published September 2004. Originally
approved in 1931. Last previous edition approved in 2004 as A 131/A 131M – 04.
of 8.2.1.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.4 Plates in all thicknesses ordered to Grade CS shall be
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
normalized. Plates in all thicknesses ordered to Grade E shall
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. be normalized, or thermo-mechanical control processed. Plates
*A Summary of Changes section appears at the end of this standard.
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