ASTM A976-18
(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, A876, and A1086. 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 SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to customary (cgs-emu and inch-pound) 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:A976 −18
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 Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
1.1 This document classifies insulating coatings for electri-
Barriers to Trade (TBT) Committee.
cal steels according to their composition, relative insulating
ability,andfunctionality.Thepurposeofthisclassificationisto
2. Referenced Documents
assist users of insulating coatings by providing general infor-
2
2.1 ASTM Standards:
mation about the chemical nature and use of the coatings, as
A340 Terminology of Symbols and Definitions Relating to
well as to provide important data concerning limits to their use,
Magnetic Testing
that is, relative insulating ability, punchability, temperature
A345 Specification for Flat-Rolled Electrical Steels for
stability, weldability, and fabricability. Specific surface insula-
Magnetic Applications
tion resistivity values for each coating are not included in this
A677 Specification for Nonoriented Electrical Steel Fully
classification. The user is referred to the flat-rolled electrical
Processed Types
steel specifications noted in 1.2 should more detailed informa-
A683 Specification for Nonoriented Electrical Steel, Semi-
tion concerning surface insulation resistivity values be re-
processed Types
quired.
A717/A717M TestMethodforSurfaceInsulationResistivity
1.2 This classification is to be used in conjunction with the
of Single-Strip Specimens
various specifications for flat-rolled electrical steels under the
A726 Specification for Cold-Rolled Magnetic Lamination
jurisdiction of CommitteeA06, including Specifications A345,
Quality Steel, Semiprocessed Types
A677, A683, A726, A840, A876, and A1086. However, in
A840 Specification for Fully Processed Magnetic Lamina-
3
those instances in which the coating descriptions and charac-
tion Steel (Withdrawn 2011)
teristics differ between this classification and any of the
A876 Specification for Flat-Rolled, Grain-Oriented, Silicon-
specifications, this classification shall supersede the specifica-
Iron, Electrical Steel, Fully Processed Types
tion.
A937/A937M Test Method for Determining Interlaminar
Resistance of Insulating Coatings Using Two Adjacent
1.3 The values stated in SI units are to be regarded as
Test Surfaces
standard. The values given in parentheses are mathematical
A1086 Specification for Thin-Gauge Nonoriented Electrical
conversions to customary (cgs-emu and inch-pound) units
Steel Fully Processed Types
whichareprovidedforinformationonlyandarenotconsidered
standard.
3. Terminology
1.4 This standard does not purport to address all of the
3.1 Definitions of Terms Specific to This Standard:
safety concerns, if any, associated with its use. It is the
3.1.1 interlaminar resistance, n—the average resistance of
responsibility of the user of this standard to establish appro-
two adjacent insulating surfaces in contact with each other, in
priate safety, health, and environmental practices and deter-
accordance with Test Method A937/A937M.
mine the applicability of regulatory limitations prior to use.
3.1.2 stress-relief anneal, n—heat treatment that improves
1.5 This international standard was developed in accor-
the magnetic properties of electrical steel by relieving internal
dance with internationally recognized principles on standard-
stresses which are introduced during fabrication of magnetic
ization established in the Decision on Principles for the
cores.
1 2
This classification is under the jurisdiction of ASTM Committee A06 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Magnetic Properties and is the direct responsibility of Subcommittee A06.02 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 Oct. 1, 2018. Published October 2018. Originally the ASTM website.
3
published in 1997. Last previous edition approved in 2013 as A976 – 13. DOI: The last approved version of this historical standard is referenced on
10.1520/A0976-18. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, P
...
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 − 13 A976 − 18
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, A876and , and A876A1086. 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) SI units are to be regarded as standard. The values given in
parentheses are mathematical conversions to SI customary (cgs-emu and inch-pound) 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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
3
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
A1086 Specification for Thin-Gauge Nonoriented Electrical Steel Fully Processed Types
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
1
This classification 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 Nov. 1, 2013Oct. 1, 2018. Published November 2013October 2018. Originally published in 1997. Last previous edition approved in 20082013
as A976 – 03 (2008).A976 – 13. DOI: 10.1520/A0976-13.10.1520/A0976-18.
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
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A976 − 18
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