Standard Practice for Identification of Standard Electrical Steel Grades in ASTM Specifications

ABSTRACT
This practice explains the procedure for identifying standard grades and types of flat-rolled electrical steels in ASTM electrical steel specifications. This practice applies to flat-rolled magnetically soft irons and steel such as low-carbon steels and alloys of iron with silicon, aluminum, and so forth produced to a specified thickness and maximum value of core loss. These designations are intended to replace the old AISI M designations which are no longer supported. The practice also has a cross-reference between thickness and electrical sheet gage number.
SCOPE
1.1 This practice covers the procedure for designating (within ASTM specifications) standard grades of flat-rolled electrical steels made to specified maximum values of core loss. This practice applies to magnetically soft irons and steel (low-carbon steels and alloys of iron with silicon, aluminum, and so forth) where a core loss measurement at a stated peak value of alternating induction and a stated frequency, such as 15 kG (1.5 T) and 60 Hz, is normally used to grade the material. This practice also applies when some other property is specified (or a different induction or frequency, or both) as the limiting characteristic, provided the material also meets all the requirements of the ASTM specification.
1.2 Individual specifications that are in conformity with this practice are Specifications A 677, A 683, A 726, A 840/A 840M, and A 876.
1.3 The values stated in customary (cgs-emu and inch-pound) units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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Historical
Publication Date
30-Apr-2006
Technical Committee
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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´1
Designation: A664 – 06
Standard Practice for
Identification of Standard Electrical Steel Grades in ASTM
1
Specifications
This standard is issued under the fixed designation A664; 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
´ NOTE—The values statement (1.3) was corrected editorially in September 2006.
1. Scope A340 Terminology of Symbols and Definitions Relating to
Magnetic Testing
1.1 This practice covers the procedure for designating
A677 Specification for Nonoriented Electrical Steel Fully
(within ASTM specifications) standard grades of flat-rolled
Processed Types
electrical steels made to specified maximum values of core
A683 Specification for Nonoriented Electrical Steel, Semi-
loss. This practice applies to magnetically soft irons and steel
processed Types
(low-carbon steels and alloys of iron with silicon, aluminum,
A726 Specification for Cold-Rolled Magnetic Lamination
and so forth) where a core loss measurement at a stated peak
Quality Steel, Semiprocessed Types
value of alternating induction and a stated frequency, such as
A840/A840M Specification for Fully Processed Magnetic
15 kG (1.5 T) and 60 Hz, is normally used to grade the
Lamination Steel
material. This practice also applies when some other property
A876 Specification for Flat-Rolled, Grain-Oriented,
is specified (or a different induction or frequency, or both) as
Silicon-Iron, Electrical Steel, Fully Processed Types
the limiting characteristic, provided the material also meets all
A976 Classification of Insulating Coatings for Electrical
the requirements of the ASTM specification.
Steels by Composition, Relative Insulating Ability and
1.2 Individual specifications that are in conformity with this
Application
practice are Specifications A677, A683, A726, A840/A840M,
and A876.
3. Terminology
1.3 The values stated in customary (cgs-emu and inch-
3.1 The terms and symbols used in this practice are defined
pound) units are to be regarded as standard. The values given
in Terminology A340.
in parentheses are mathematical conversions to SI units which
are provided for information only and are not considered
4. Procedure
standard.
4.1 General Requirements of the Core-Loss-Type
1.4 This standard does not purport to address all of the
Designations—The core-loss-type designations to be used for
safety concerns, if any, associated with its use. It is the
ordering purposes and for identification of the shipped material
responsibility of the user of this standard to establish appro-
in ASTM specifications for electrical steels shall be a six-
priate safety and health practices and determine the applica-
character identification (for example, 36F145) comprised of
bility of regulatory limitations prior to use.
the following basic elements:
2. Referenced Documents 4.1.1 First Two Digits—The first two digits of the grade
2 designation shall represent the nominal decimal thickness of
2.1 ASTM Standards:
the material in millimetres. For instance, the number 36
represents a thickness of 0.36 mm or 0.014 in. Refer to
1
This practice is under the jurisdiction of ASTM Committee A06 on Magnetic
Appendix X1 for the relationship between Electrical Sheet
Properties and is the direct responsibility of Subcommittee A06.02 on Material
Gauge Number and thickness.
Specifications.
4.1.2 Code Letters—A code letter shall designate the gen-
Current edition approved May 1, 2006. Published May 2006. Originally
approved in 1972. Last previous edition approved in 1999 as A664 – 99. DOI: eral category of magnetic material and the standard sampling
10.1520/A0664-06E01.
and testing practices that apply. The precise conditions of
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
sampling and testing are given in the ASTM specification
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
covering each class of material. The code letter to be used and
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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A664 – 06
TABLE 1 Code Letters and Sampling and Testing Conditions
Code Letter ASTM Specification Class of Material and Core-Loss Testing Conditions
C A840/A840M Magnetic lamination steel, fully processed, with core-loss value determined at
A
15 kG (1.5 T) and 60 Hz on as-sheared Epstein specimens.
D A726 Magnetic lamination steel, semiprocessed, with core-loss value determined at
A
15 kG (1.5 T) and 60 Hz on Epstein specimens a
...

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