ASTM A664-11
(Practice)Standard Practice for Identification of Standard Electrical Steel Grades in ASTM Specifications
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 A677, A683, A726, and A876.
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 which are provided for information only and are not considered standard.
1.4 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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Designation:A664 −11
StandardPractice 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. Scope A683 Specification for Nonoriented Electrical Steel, Semi-
processed Types
1.1 This practice covers the procedure for designating
A726 Specification for Cold-Rolled Magnetic Lamination
(within ASTM specifications) standard grades of flat-rolled
Quality Steel, Semiprocessed Types
electrical steels made to specified maximum values of core
A876 Specification for Flat-Rolled, Grain-Oriented, Silicon-
loss. This practice applies to magnetically soft irons and steel
Iron, Electrical Steel, Fully Processed Types
(low-carbon steels and alloys of iron with silicon, aluminum,
A976 Classification of Insulating Coatings for Electrical
and so forth) where a core loss measurement at a stated peak
Steels by Composition, Relative Insulating Ability and
value of alternating induction and a stated frequency, such as
Application
15 kG (1.5 T) and 60 Hz, is normally used to grade the
material. This practice also applies when some other property
3. Terminology
is specified (or a different induction or frequency, or both) as
the limiting characteristic, provided the material also meets all
3.1 The terms and symbols used in this practice are defined
the requirements of the ASTM specification. in Terminology A340.
1.2 Individual specifications that are in conformity with this
4. Procedure
practice are Specifications A677, A683, A726, and A876.
4.1 General Requirements of the Core-Loss-Type
1.3 The values stated in customary (cgs-emu and inch-
Designations—The core-loss-type designations to be used for
pound) units are to be regarded as standard. The values given
ordering purposes and for identification of the shipped material
in parentheses are mathematical conversions to SI units which
in ASTM specifications for electrical steels shall be a six-
are provided for information only and are not considered
character identification (for example, 36F145) comprised of
standard.
the following basic elements:
1.4 This standard does not purport to address all of the
4.1.1 First Two Digits—The first two digits of the grade
safety concerns, if any, associated with its use. It is the
designation shall represent the nominal decimal thickness of
responsibility of the user of this standard to establish appro-
the material in millimetres. For instance, the number 36
priate safety and health practices and determine the applica-
represents a thickness of 0.36 mm or 0.014 in. Refer to
bility of regulatory limitations prior to use.
Appendix X1 for the relationship between Electrical Sheet
Gauge Number and thickness.
2. Referenced Documents
4.1.2 Code Letters—A code letter shall designate the gen-
2
2.1 ASTM Standards:
eral category of magnetic material and the standard sampling
A340 Terminology of Symbols and Definitions Relating to
and testing practices that apply. The precise conditions of
Magnetic Testing
sampling and testing are given in the ASTM specification
A677 Specification for Nonoriented Electrical Steel Fully
covering each class of material. The code letter to be used and
Processed Types
the sampling and testing conditions associated with that letter
shall be as in Table 1.
1
This practice is under the jurisdiction of ASTM Committee A06 on Magnetic
4.1.3 Last Digits—The last three digits of the grade desig-
Properties and is the direct responsibility of Subcommittee A06.02 on Material
nation shall represent the maximum permissible core loss in
Specifications.
watts per pound for the test conditions indicated by the code
Current edition approved Oct. 1, 2011. Published October 2011. Originally
´1
letter. For instance, the 145 designation on a standard ASTM
approved in 1972. Last previous edition approved in 2006 as A664–06 . DOI:
10.1520/A0664-11.
specification used in conjunction with the Code Letter F
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
represents 1.45 W/lb for the maximum value of core loss
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
determined at 15 kG (1.5 T) and 60 Hz on an as-sheared
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Epstein specimen consisting of one half of the strips cut
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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A664−11
TABLE 1 Code Letters and Sampling a
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation:A664–06 Designation: A664 – 11
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
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
inductionandastatedfrequency,suchas15kG(1.5T)and60Hz,isnormallyusedtogradethematerial.Thispracticealsoapplies
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 SpecificationsA677,A683,A726,A840/A840M, and
A876.
1.3The1.3 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 which are provided for information only and are not considered standard.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
A340 Terminology of Symbols and Definitions Relating to Magnetic Testing
A677 Specification for Nonoriented Electrical Steel Fully Processed Types
A683 Specification for Nonoriented Electrical Steel, Semiprocessed Types
A726 Specification for Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed Types A840/A840MSpecification for
Fully Processed Magnetic
Lamination Steel
A876 Specification for Flat-Rolled, Grain-Oriented, Silicon-Iron, Electrical Steel, Fully Processed Types
A976 Classification of Insulating Coatings for Electrical Steels by Composition, Relative Insulating Ability and Application
3. Terminology
3.1 The terms and symbols used in this practice are defined in Terminology A340.
4. Procedure
4.1 General Requirements of the Core-Loss-Type Designations—The core-loss-type designations to be used for ordering
purposes and for identification of the shipped material in ASTM specifications for electrical steels shall be a six-character
identification (for example, 36F145) comprised of the following basic elements:
4.1.1 First Two Digits—The first two digits of the grade designation shall represent the nominal decimal thickness of the
material in millimetres. For instance, the number 36 represents a thickness of 0.36 mm or 0.014 in. Refer toAppendix X1 for the
1
This practice is under the jurisdiction of ASTM Committee A06 on Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on Material
Specifications.
Current edition approved May 1, 2006. Published May 2006. Originally approved in 1972. Last previous edition approved in 1999 as A664–99. DOI:
10.1520/A0664-06E01.
´1
Current edition approved Oct. 1, 2011. Published October 2011. Originally approved in 1972. Last previous edition approved in 2006 as A664–06 . DOI:
10.1520/A0664-11.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book ofASTM 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.
1
---------------------- Page: 1 ----------------------
A664 – 11
relationship between Electrical Sheet Gauge Number and thickness.
4.1.2 Code Letters—A code letter shall designate the general category of magnetic material and the standard sampling and
testingpracticesthatapply.ThepreciseconditionsofsamplingandtestingaregivenintheASTMspecificationcoveringeachclass
of material. The code letter to be used and the sampling a
...
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