ASTM A1008/A1008M-12a
(Specification)Standard Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, Solution Hardened, and Bake Hardenable
Standard Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, Solution Hardened, and Bake Hardenable
ABSTRACT
This specification covers cold-rolled, carbon steel sheets, in coils and cut lengths, in the following designations: commercial steels (CS Types A, B, and C); drawing steel (DS Types A and B); deep drawing steel (DDS); extra deep drawing steel (EDDS); structural steel (SS Grades 25[170], 30[205], 33[230] Types 1 and 2, 40[275] Types 1 and 2, 50[340], 60[410], 70[480], and 80[550]); high-strength low-alloy steel (HSLAS Classes 1 and 2 of Grades 45[310], 50[340]. 55[380], 60[410], 65[450], and 70[480]), high-strength low-alloy steel with improved formability (HSLAS-F Grades 50[340], 60[410], 70[480], and 80[550]); solution hardened steel (SHS); and bake hardenable steel (BHS). Conformance of the steel sheets to chemical composition requirements shall be tested by heat analysis. Specimens shall also undergo tension and bending tests and shall conform to specified values of tensile and yield strength, elongation, and bake hardening index. Unless otherwise indicated, sheet surfaces shall have a matte finish and shall be oiled.
SCOPE
1.1 This specification covers cold-rolled, carbon, structural, high-strength low-alloy, high-strength low-alloy with improved formability, solution hardened, and bake hardenable steel sheet, in coils and cut lengths.
1.2 Cold rolled steel sheet is available in the designations as listed in 4.1.
1.3 This specification does not apply to steel strip as described in Specification A109/A109M.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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Designation:A1008/A1008M −12a
StandardSpecification for
Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Strength
Low-Alloy, High-Strength Low-Alloy with Improved
1
Formability, Solution Hardened, and Bake Hardenable
This standard is issued under the fixed designation A1008/A1008M; 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.
1. Scope* E646 Test Method for Tensile Strain-Hardening Exponents
(n -Values) of Metallic Sheet Materials
1.1 This specification covers cold-rolled, carbon, structural,
high-strength low-alloy, high-strength low-alloy with im-
3. Terminology
proved formability, solution hardened, and bake hardenable
steel sheet, in coils and cut lengths. 3.1 Definitions of Terms Specific to This Standard:
3.1.1 For definitions of other terms used in this
1.2 Cold rolled steel sheet is available in the designations as
specification, refer to Terminology A941.
listed in 4.1.
3.1.2 aging—loss of ductility with an increase in hardness,
1.3 This specification does not apply to steel strip as
yield strength, and tensile strength that occurs when steel that
described in Specification A109/A109M.
has been slightly cold worked (such as by temper rolling) is
1.4 The values stated in either SI units or inch-pound units stored for some time.
are to be regarded separately as standard. The values stated in 3.1.2.1 Discussion—Aging increases the tendency of a steel
each system may not be exact equivalents; therefore, each to exhibit stretcher strains and fluting.
system shall be used independently of the other. Combining
3.1.3 bake hardenable steel—steel in which significant ag-
values from the two systems may result in non-conformance
ing is realized when moderate heat treatment, such as that used
with the standard.
for paint baking, follows straining or cold working.
3.1.4 inclusion control, n—the process of reducing the
2. Referenced Documents
volume fraction of inclusions or modifying the shape of
2
2.1 ASTM Standards:
inclusions to improve formability, weldability, and machinabil-
A109/A109M Specification for Steel, Strip, Carbon (0.25
ity.
Maximum Percent), Cold-Rolled
3.1.4.1 Discussion—Inclusions, especially those elongated
A370 Test Methods and Definitions for Mechanical Testing
during the rolling process, create the conditions for initiating
of Steel Products
and/or propagating cracks when the material is stretched or
A568/A568M Specification for Steel, Sheet, Carbon,
bent during the manufacture of a part. The adverse effects of
Structural,andHigh-Strength,Low-Alloy,Hot-Rolledand
inclusions are minimized by reducing the content of inclusions
Cold-Rolled, General Requirements for
in the steel and/or by altering the shape of inclusions through
A941 TerminologyRelatingtoSteel,StainlessSteel,Related
theuseofadditionsduringthesteelmakingprocessthatchange
Alloys, and Ferroalloys
the elongated shape of the inclusions to less harmful small,
E18 Test Methods for Rockwell Hardness of Metallic Ma-
well dispersed globular inclusions.
terials
3.1.5 solid-solution hardened steel or solution hardened
E517 Test Method for Plastic Strain Ratio r for Sheet Metal
steel—steel strengthened through additions of elements, such
as Mn, P, or Si, that can be dissolved within the crystalline
structure of steels.
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This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee 3.1.5.1 Discussion—Alloying elements that form a solid-
A01.19 on Steel Sheet and Strip.
solution with iron provide strengthening as a result of local
Current edition approved Nov. 1, 2012. Published November 2012. Originally
distortions in atomic arrangements, which arise as a result of
approved in 2000. Last previous edition approved in 2012 as A1008/A1008M – 12.
the mismatch between the atomic sizes of such elements and
DOI: 10.1520/A1008_A1008M-12a.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
that of iron.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3.1.6 stabilization—addition of one or more nitride- or
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. carbide-forming elements, or both, such as titanium and
*A Summary of Changes section appears at the end of this standard
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A1008/A1008M−12a
columbium, to control the level of the interstitial elements of 5.1.2.2 When a class is not spe
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