ASTM A664-99
(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
SCOPE
1.1 This practice covers the procedure for designating (within ASTM specifications) standard grades of flat-rolled electrical and lamination steels made to specified maximum values of core loss. It applies to magnetically soft irons and steel (low-carbon steels and alloys of iron with silicon, aluminum, etc.) 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 utilized to grade the material. It 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 specification are A677, A677M, A683, A683M, A726, A726M, A840, A840M, A876, A876M.
1.3 This standard does not purport to address all of the safety problems, 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: A 664 – 99
Standard Practice for
Identification of Standard Electrical Steel Grades in ASTM
Specifications
This standard is issued under the fixed designation A 664; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope A 677 Specification for Nonoriented Electrical Steel Fully
Processed Types
1.1 This practice covers the procedure for designating
A 677M Specification for Nonoriented Electrical Steel,
(within ASTM specifications) standard grades of flat-rolled
Fully Processed Types (Metric)
electrical steels made to specified maximum values of core
A 683/A 683M Specification for Nonoriented Electrical
loss. This practice applies to magnetically soft irons and steel
Steel, Semiprocessed Types
(low-carbon steels and alloys of iron with silicon, aluminum,
A 726 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
A 840 Specification for Fully Processed Magnetic Lamina-
15 kG [1.5 T] and 60 Hz, is normally used to grade the
tion Steel
material. This practice also applies when some other property
A 840M Specification for Fully Processed Magnetic Lami-
is specified (or a different induction or frequency, or both) as
nation Steel (Metric)
the limiting characteristic, provided the material also meets all
A 876/A 876M Specification for Flat-Rolled Grain-
the requirements of the ASTM specification.
Oriented, Silicon-Iron, Electrical Steel, Fully Processed
1.2 Individual specifications that are in conformity with this
Types
practice are Specifications A 677, A 677M, A 683/A 683M,
A 976 Classification of Insulating Coatings by Composi-
A 726, A 840, A 840M, and A 876/A 876M.
tion, Relative Insulating Ability and Application
1.3 The values stated in either customary (cgs-emu and
inch-pound) units or SI units are to be regarded separately as
3. Terminology
standard. Within the text, the SI units are shown in brackets.
3.1 The terms and symbols used in this practice are defined
The values stated in each system are not exact equivalents;
in Terminology A 340.
therefore,eachsystemshallbeusedindependentlyoftheother.
Combining values from the two systems may result in noncon-
4. Procedure
formance with this practice.
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
designation shall represent the nominal decimal thickness of
2.1 ASTM Standards:
the material in millimetres. For instance, the number 36
A 340 Terminology of Symbols and Definitions Relating to
3 represents a thickness of 0.36 mm or 0.014 in. Refer to
Magnetic Testing
Appendix X1 for the relationship between Electrical Sheet
Gage Number and thickness.
This practice is under the jurisdiction of ASTM Committee A06 on Magnetic 4.1.2 Code Letters—A code letter shall designate the gen-
Properties and is the direct responsibility of Subcommittee A06.02 on Material
eral category of magnetic material and the standard sampling
Specifications.
and testing practices that apply. The precise conditions of
Current edition approved May 10, 1999. Published August 1999. Originally
sampling and testing are given in the ASTM specification
published as A 664-72. Last previous edition A 664-93.
The existing metric companion specifications are being eliminated in favor of covering each class of material. The code letter to be used and
combined units standards. The elimination of such specifications will be done as
the sampling and testing conditions associated with that letter
they become due for review. Because of this change, the reader is urged not to use
shall be as follows:
the metric companion documents.
Annual Book of ASTM Standards, Vol 03.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A 664–99
watts per pound for the test conditions indicated by the code
Code ASTM Class of Material and Core-Loss
Letter Specification Testing Conditions
letter. For instance, the 145 designation on a standard ASTM
specification used in conjunction with the Code Letter F
C A 840 Magnetic lamination steel, fully processed, with core-
loss value determined at 15 kG [1.5 T] and 60 Hz represents 1.45 W/lb for the maximum value of core loss
A
on as-sheared Epstein specimens.
determined at 15 kG [1.5 T] and 60 Hz on an as-sheared
D A 726 Magnetic lamination steel, semiprocessed, with core-
Epstein specimen consisting of one half of the strips cut
loss value determined at 15 kG [1.5 T] and 60 Hz
A
on Epstein specimens after a quality development
parallel to the rolling direction and the other half cut perpen-
anneal at 1450°F [790°C] with a 1-h so
...
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