ASTM A684/A684M-10a
(Specification)Standard Specification for Steel, Strip, High-Carbon, Cold-Rolled
Standard Specification for Steel, Strip, High-Carbon, Cold-Rolled
ABSTRACT
This specification covers cold-rolled, high-carbon strip. The strip shall be furnished cold rolled spheroidized annealed, soft annealed, intermediate hardness, or full hard, as specified. The heat or cast analysis shall conform to that specified requirement. Hardness test and bend test shall be made to conform to the requirements specified.
SCOPE
1.1 This specification covers cold-rolled, high-carbon strip in coils or cut lengths. Strip is classified as product that is 0.3000 in. [7.6 mm] or less in thickness and over ½ to 2315/16 in. [12.5 to 600 mm] in width, inclusive. Strip tolerance products may be available in widths wider than 2315/16 in. (600 mm) by agreement between purchaser and supplier; however, such products are technically classified as cold-rolled sheet. The maximum of the specified carbon range is over 0.25 to 1.35 %, inclusive. It is furnished in the following types as specified:
1.1.1 Soft spheroidized annealed high-carbon steel is intended for applications requiring maximum cold forming. It is normally produced to give the lowest maximum Rockwell hardness for each grade.
1.1.2 Soft annealed high-carbon steel is intended for applications requiring moderate cold forming. It is produced to a maximum Rockwell hardness.
1.1.3 Intermediate hardness high-carbon steel is intended for applications where cold forming is slight or a stiff, springy product is needed, or both. It is produced to specified Rockwell hardness ranges, the maximum being higher than obtained for the annealed type.
1.1.4 Full hard high-carbon steel is intended for flat applications. It is produced to minimum Rockwell hardness requirements, which vary with grade, microstructure and gauge. Full hard can be produced with either a pearlitic or spheroidized microstructure or a mixture of both. The minimum hardness should be established between the consumer and the producer.
1.2 This specification is applicable for orders in either inch-pound units or SI units.
1.3 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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Standards Content (Sample)
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Designation: A684/A684M – 10a
Standard Specification for
1
Steel, Strip, High-Carbon, Cold-Rolled
This standard is issued under the fixed designationA684/A684M; 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* 1.4 The tolerances in this specification are different than
those in Specification A568/A568M and Specification A109/
1.1 This specification covers cold-rolled, high-carbon strip
A109M.
in coils or cut lengths. Strip is classified as product that is
1.5 For the purpose of determining conformance with this
1 15
0.3000 in. [7.6 mm] or less in thickness and over ⁄2 to 23 ⁄16
specification, values shall be rounded to the nearest unit in the
in. [12.5 to 600 mm] in width, inclusive. Strip tolerance
right hand place of figures used in expressing the limiting
15
products may be available in widths wider than 23 ⁄16 in. (600
values in accordance with the rounding method of Practice
mm) by agreement between purchaser and supplier; however,
E29.
such products are technically classified as cold-rolled sheet.
1.6 This specification is expressed in both inch-pound units
The maximum of the specified carbon range is over 0.25 to
and SI units. However, unless the order specifies the applicable
1.35 %, inclusive. It is furnished in the following types as
“M” specification designation (SI units), the material shall be
specified:
furnished to inch-pound units.The metric portions of the tables
1.1.1 Soft spheroidized annealed high-carbon steel is in-
herein list permissible variations in dimensions and mass (see
tended for applications requiring maximum cold forming. It is
Note 1) in SI (metric) units. The values listed are not exact
normally produced to give the lowest maximum Rockwell
conversions of the values listed in the inch-pound tables but
hardness for each grade.
instead are rounded or rationalized values. Conformance to SI
1.1.2 Soft annealed high-carbon steel is intended for appli-
tolerances is mandatory when the “M” specification is used.
cations requiring moderate cold forming. It is produced to a
maximum Rockwell hardness.
NOTE 1—The term weight is used when inch-pound units are the
1.1.3 Intermediate hardness high-carbon steel is intended
standard. However, under SI the preferred term is mass.
for applications where cold forming is slight or a stiff, springy
2. Referenced Documents
product is needed, or both. It is produced to specified Rockwell
2
2.1 ASTM Standards:
hardness ranges, the maximum being higher than obtained for
the annealed type. A109/A109M Specification for Steel, Strip, Carbon (0.25
Maximum Percent), Cold-Rolled
1.1.4 Full hard high-carbon steel is intended for flat appli-
cations. It is produced to minimum Rockwell hardness require- A370 Test Methods and Definitions for Mechanical Testing
of Steel Products
ments, which vary with grade, microstructure and gauge. Full
hard can be produced with either a pearlitic or spheroidized A568/A568M Specification for Steel, Sheet, Carbon, Struc-
tural, and High-Strength, Low-Alloy, Hot-Rolled and
microstructure or a mixture of both. The minimum hardness
should be established between the consumer and the producer. Cold-Rolled, General Requirements for
A700 PracticesforPackaging,Marking,andLoadingMeth-
1.2 This specification is applicable for orders in either
inch-pound units or SI units. ods for Steel Products for Shipment
A751 Test Methods, Practices, andTerminology for Chemi-
1.3 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in cal Analysis of Steel Products
A941 Terminology Relating to Steel, Stainless Steel, Re-
each system may not be exact equivalents; therefore, each
lated Alloys, and Ferroalloys
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance E3 Guide for Preparation of Metallographic Specimens
E29 Practice for Using Significant Digits in Test Data to
with the standard.
Determine Conformance with Specifications
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
A01.19 on Steel Sheet and Strip.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2010. Published November 2010. Originally
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1973. Last previous edition approved in 2010 as A684/A684M – 10.
Standards volume information, ref
...
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