ASTM A976-13
(Classification)Standard Classification of Insulating Coatings for Electrical Steels by Composition, Relative Insulating Ability and Application
Standard Classification of Insulating Coatings for Electrical Steels by Composition, Relative Insulating Ability and Application
SIGNIFICANCE AND USE
4.1 This classification establishes categories of insulating coatings based on their chemical nature, relative insulating ability, and typical applications. These categories describe general physical and chemical characteristics of the coatings that are useful in making broad estimates of their insulating ability and suitability for various applications.
SCOPE
1.1 This document classifies insulating coatings for electrical steels according to their composition, relative insulating ability, and functionality. The purpose of this classification is to assist users of insulating coatings by providing general information about the chemical nature and use of the coatings, as well as to provide important data concerning limits to their use, that is, relative insulating ability, punchability, temperature stability, weldability, and fabricability. Specific surface insulation resistivity values for each coating are not included in this classification. The user is referred to the flat-rolled electrical steel specifications noted in 1.2 should more detailed information concerning surface insulation resistivity values be required.
1.2 This classification is to be used in conjunction with the various specifications for flat-rolled electrical steels under the jurisdiction of Committee A06, including Specifications A345, A677, A683, A726, A840, and A876. However, in those instances in which the coating descriptions and characteristics differ between this classification and any of the specifications, this classification shall supersede the specification.
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:A976 −13
Standard Classification of
Insulating Coatings for Electrical Steels by Composition,
1
Relative Insulating Ability and Application
This standard is issued under the fixed designation A976; 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 2. Referenced Documents
2
1.1 This document classifies insulating coatings for electri- 2.1 ASTM Standards:
cal steels according to their composition, relative insulating A340 Terminology of Symbols and Definitions Relating to
ability,andfunctionality.Thepurposeofthisclassificationisto Magnetic Testing
assist users of insulating coatings by providing general infor- A345 Specification for Flat-Rolled Electrical Steels for
mation about the chemical nature and use of the coatings, as Magnetic Applications
well as to provide important data concerning limits to their use, A677 Specification for Nonoriented Electrical Steel Fully
that is, relative insulating ability, punchability, temperature Processed Types
stability, weldability, and fabricability. Specific surface insula- A683 Specification for Nonoriented Electrical Steel, Semi-
tion resistivity values for each coating are not included in this processed Types
classification. The user is referred to the flat-rolled electrical A717/A717M TestMethodforSurfaceInsulationResistivity
steel specifications noted in 1.2 should more detailed informa- of Single-Strip Specimens
tion concerning surface insulation resistivity values be re- A726 Specification for Cold-Rolled Magnetic Lamination
quired. Quality Steel, Semiprocessed Types
A840 Specification for Fully Processed Magnetic Lamina-
1.2 This classification is to be used in conjunction with the
3
tion Steel (Withdrawn 2011)
various specifications for flat-rolled electrical steels under the
A876 Specification for Flat-Rolled, Grain-Oriented, Silicon-
jurisdiction of CommitteeA06, including Specifications A345,
Iron, Electrical Steel, Fully Processed Types
A677, A683, A726, A840, and A876. However, in those
A937/A937M Test Method for Determining Interlaminar
instances in which the coating descriptions and characteristics
Resistance of Insulating Coatings Using Two Adjacent
differ between this classification and any of the specifications,
Test Surfaces
this classification shall supersede the specification.
1.3 The values stated in customary (cgs-emu and inch-
3. Terminology
pound) units are to be regarded as standard. The values given
3.1 Definitions of Terms Specific to This Standard:
in parentheses are mathematical conversions to SI units which
3.1.1 interlaminar resistance, n—the average resistance of
are provided for information only and are not considered
two adjacent insulating surfaces in contact with each other, in
standard.
accordance with Test Method A937/A937M.
1.4 This standard does not purport to address all of the
3.1.2 stress-relief anneal, n—heat treatment that improves
safety concerns, if any, associated with its use. It is the
the magnetic properties of electrical steel by relieving internal
responsibility of the user of this standard to establish appro-
stresses which are introduced during fabrication of magnetic
priate safety and health practices and determine the applica-
cores.
bility of regulatory limitations prior to use.
1 2
This classification is under the jurisdiction of ASTM CommitteeA06 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Magnetic Properties and is the direct responsibility of SubcommitteeA06.02 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Material Specifications. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Nov. 1, 2013. Published November 2013. Originally the ASTM website.
3
published in 1997. Last previous edition approved in 2008 as A976 – 03 (2008). The last approved version of this historical standard is referenced on
DOI: 10.1520/A0976-13. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A976−13
3.1.3 surface insulation resistivity, n— the effective resistiv- fied applied voltage. This current value often is referred to as
ity of a single insulating layer tested between applied bare the“FranklinCurrent”andmaybeuseddirectlyasanindicator
metal contacts and the base metal of the insulated test of the quality of the insulation. Specifically, a Franklin Current
specimen, in accordance with Test Method A717/A717M. ofzerocorrespondstoaperfectinsulator.AFranklinCurrentof
1 ampere co
...
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.
Designation: A976 − 03 (Reapproved 2008) A976 − 13
Standard Classification of
Insulating Coatings for Electrical Steels by Composition,
1
Relative Insulating Ability and Application
This standard is issued under the fixed designation A976; 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
1.1 This document classifies insulating coatings for electrical steels according to their composition, relative insulating ability,
and functionality. The purpose of this classification is to assist users of insulating coatings by providing general information about
the chemical nature and use of the coatings, as well as to provide important data concerning limits to their use, that is, relative
insulating ability, punchability, temperature stability, weldability, and fabricability. Specific surface insulation resistivity values for
each coating are not included in this classification. The user is referred to the flat-rolled electrical steel specifications noted in 1.2
should more detailed information concerning surface insulation resistivity values be required.
1.2 This classification is to be used in conjunction with the various specifications for flat-rolled electrical steels under the
jurisdiction of Committee A06, including Specifications A345, A677, A683, A726, A840, and A876. However, in those instances
in which the coating descriptions and characteristics differ between this classification and any of the specifications, this
classification shall supersede the specification.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
A340 Terminology of Symbols and Definitions Relating to Magnetic Testing
A345 Specification for Flat-Rolled Electrical Steels for Magnetic Applications
A677 Specification for Nonoriented Electrical Steel Fully Processed Types
A683 Specification for Nonoriented Electrical Steel, Semiprocessed Types
A717/A717M Test Method for Surface Insulation Resistivity of Single-Strip Specimens
A726 Specification for Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed Types
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A840 Specification for Fully Processed Magnetic Lamination Steel (Withdrawn 2011)
A876 Specification for Flat-Rolled, Grain-Oriented, Silicon-Iron, Electrical Steel, Fully Processed Types
A937/A937M Test Method for Determining Interlaminar Resistance of Insulating Coatings Using Two Adjacent Test Surfaces
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 interlaminar resistance, n—the average resistance of two adjacent insulating surfaces in contact with each other, in
accordance with Test Method A937/A937M.
3.1.2 stress-relief anneal, n—heat treatment that improves the magnetic properties of electrical steel by relieving internal
stresses which are introduced during fabrication of magnetic cores.
1
This classification is under the jurisdiction of ASTM CommitteeA06 on Magnetic Properties and is the direct responsibility of SubcommitteeA06.02 on Material
Specifications.
Current edition approved Nov. 1, 2008Nov. 1, 2013. Published December 2008November 2013. Originally published in 1997. Last previous edition approved in 20032008
as A976 – 03.A976 – 03 (2008). DOI: 10.1520/A0976-03R08.10.1520/A0976-13.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A976 − 13
3.1.3 surface insulation resistivity, n— the effective resistivity of a single insulating layer tested between applied ba
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