ASTM A131/A131M-08
(Specification)Standard Specification for Structural Steel for Ships
Standard Specification for Structural Steel for Ships
ABSTRACT
This specification covers structural steel plates, shapes, bars, and rivets for use in ship construction. Materials under this specification can be categorized as ordinary strength and higher strength. Plates in all thicknesses shall be normalized or thermo-mechanical control processed while shapes and bars in all thicknesses shall be heat treated and rolled. Heat analysis of ordinary strength structural steel shall be used to determine the required chemical composition for carbon, manganese, phosphorus, sulfur, nickel, chromium, molybdenum, silicon, and copper. Same analysis shall be used to higher strength structural steel to determine the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, vanadium, aluminum, titanium, nickel, chromium, molybdenum, silicon, copper, nickel, and niobium. Materials shall conform to the required metallurgical structure which shall be evaluated by determining the average grain size. Mechanical properties such as elongation and toughness shall be evaluated using tension test and Charpy V-notch impact test.
SCOPE
1.1 This specification covers structural steel plates, shapes, bars, and rivets intended primarily for use in ship construction.
1.2 Material under this specification is available in the following categories:
1.2.1 Ordinary Strength—Grades A, B, D, and E with a specified minimum yield point of 34 ksi [235 MPa], and
1.2.2 Higher Strength—Grades AH, DH, EH, and FH with a specified minimum yield point of 46 ksi [315 MPa], 51 ksi [350 MPa], or 57 ksi [390 MPa].
1.3 Shapes and bars are normally available as Grades A, AH32, and AH36. Other grades may be furnished by agreement between the purchaser and the manufacturer.
1.4 The maximum thickness of products furnished under this specification is 4 in. [100 mm] for plates and 2 in. [50 mm] for shapes and bars.
1.5 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.
1.6 The values stated in either inch-pound units or SI units are to be regarded separately as the 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 this specification.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:A131/A131M −08
StandardSpecification for
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Structural Steel for Ships
This standard is issued under the fixed designationA131/A131M; 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 Department of Defense.
1. Scope* Structural Steel Bars, Plates, Shapes, and Sheet Piling
A370 Test Methods and Definitions for Mechanical Testing
1.1 This specification covers structural steel plates, shapes,
of Steel Products
bars, and rivets intended primarily for use in ship construction.
E112 Test Methods for Determining Average Grain Size
1.2 Material under this specification is available in the
following categories:
3. Terminology
1.2.1 Ordinary Strength—Grades A, B, D, and E with a
3.1 Definitions of Terms Specific to This Standard:
specified minimum yield point of 34 ksi [235 MPa], and
3.1.1 control rolling, n—a steel treatment that consists of
1.2.2 Higher Strength—GradesAH, DH, EH, and FH with a
final rolling within the range used for normalizing heat
specified minimum yield point of 46 ksi [315 MPa], 51 ksi
treatments so that the austenite completely recrystallizes.
[350 MPa], or 57 ksi [390 MPa].
3.1.2 thermo-mechanical controlled processing, n—a steel
1.3 Shapes and bars are normally available as Grades A,
treatment that consists of strict control of the steel temperature
AH32, and AH36. Other grades may be furnished by agree-
and the rolling reduction. A high proportion of the rolling
ment between the purchaser and the manufacturer.
reduction is to be carried out close to or below the Ar
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1.4 The maximum thickness of products furnished under transformation temperature and may involve rolling towards
this specification is 4 in. [100 mm] for plates and 2 in. [50 mm] the lower end of the temperature range of the intercritical
for shapes and bars. dual-phase region, thus permitting little if any recrystallization
of the austenite. The process may involve accelerated cooling
1.5 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
use or service will be utilized. See Appendix X3 of Specifica-
4. Ordering Information
tion A6/A6M for information on weldability.
4.1 Specification A6/A6M establishes the rules for the
1.6 The values stated in either inch-pound units or SI units
ordering information that should be complied with when
are to be regarded separately as the standard. Within the text,
purchasing material to this specification.
the SI units are shown in brackets. The values stated in each
4.2 Additionalorderingconsiderationsspecifictothisspeci-
system are not exact equivalents; therefore, each system must
fication are:
be used independently of the other. Combining values from the
4.2.1 Condition (control rolled or thermo-mechanical con-
two systems may result in nonconformance with this specifi-
trol processed, if applicable).
cation.
5. Materials and Manufacture
2. Referenced Documents
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5.1 Rimmed steels shall not be applied.
2.1 ASTM Standards:
A6/A6M Specification for General Requirements for Rolled
5.2 Except for GradesAand B steel, semi-killed steels shall
not be applied.
5.3 GradesD,E,AH32,AH36,AH40,DH32,DH36,DH40,
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This specification is under the jurisdiction of ASTM Committee A01 on Steel,
EH32, EH36, EH40, FH32, FH36, and FH40 shall be made
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.02 on Structural Steel for Bridges, Buildings, Rolling Stock and Ships.
using a fine grain practice. For ordinary-strength grades,
Current edition approved March 1, 2008. Published March 2008. Originally
aluminum shall be used to obtain grain refinement. For
approved in 1931. Last previous edition approved in 2007 as A131/A131M – 07.
higher-strength grades, aluminum, vanadium, or columbium
DOI: 10.1520/A0131_A0131M-08.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or (niobium) may be used for grain refinement.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.4 Plates in all thicknesses ordered to Grade E shall be
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. normalized, or thermo-mechanical control processed. Plates
*A Summary of Changes section appears at the end of this standard
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A131/A131M−08
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over 1 ⁄8 in. [35 mm] in thickness ordered to Grade D shall be
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