ASTM A976-03(2008)
(Classification)Standard Classification of Insulating Coatings by Composition, Relative Insulating Ability and Application
Standard Classification of Insulating Coatings by Composition, Relative Insulating Ability and Application
SIGNIFICANCE AND USE
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.
FIG. 1 Apparatus of Surface Insulation Resistivity Measurement for Franklin Test
FIG. 2 Diagram of Connections for Contacts and Resistors for Franklin Test
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 A 345, A 677, A 683, A 726, A 840, and A 876. 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 −03(Reapproved 2008)
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 A345 Specification for Flat-Rolled Electrical Steels for
ability,andfunctionality.Thepurposeofthisclassificationisto Magnetic Applications
assist users of insulating coatings by providing general infor- A677 Specification for Nonoriented Electrical Steel Fully
mation about the chemical nature and use of the coatings, as Processed Types
well as to provide important data concerning limits to their use, A683 Specification for Nonoriented Electrical Steel, Semi-
that is, relative insulating ability, punchability, temperature processed Types
stability, weldability, and fabricability. Specific surface insula- A717/A717M TestMethodforSurfaceInsulationResistivity
tion resistivity values for each coating are not included in this of Single-Strip Specimens
classification. The user is referred to the flat-rolled electrical A726 Specification for Cold-Rolled Magnetic Lamination
steel specifications noted in 1.2 should more detailed informa- Quality Steel, Semiprocessed Types
tion concerning surface insulation resistivity values be re- A840 Specification for Fully Processed Magnetic Lamina-
3
quired. tion Steel (Withdrawn 2011)
A876 Specification for Flat-Rolled, Grain-Oriented, Silicon-
1.2 This classification is to be used in conjunction with the
Iron, Electrical Steel, Fully Processed Types
various specifications for flat-rolled electrical steels under the
A937/A937M Test Method for Determining Interlaminar
jurisdiction of CommitteeA06, including Specifications A345,
Resistance of Insulating Coatings Using Two Adjacent
A677, A683, A726, A840, and A876. However, in those
Test Surfaces
instances in which the coating descriptions and characteristics
differ between this classification and any of the specifications,
3. Terminology
this classification shall supersede the specification.
3.1 Definitions of Terms Specific to This Standard:
1.3 The values stated in customary (cgs-emu and inch-
3.1.1 interlaminar resistance, n—the average resistance of
pound) units are to be regarded as standard. The values given
two adjacent insulating surfaces in contact with each other, in
in parentheses are mathematical conversions to SI units which
accordance with Test Method A937/A937M.
are provided for information only and are not considered
3.1.2 stress-relief anneal, n—heat treatment that improves
standard.
the magnetic properties of electrical steel by relieving internal
1.4 This standard does not purport to address all of the
stresses which are introduced during fabrication of magnetic
safety concerns, if any, associated with its use. It is the
cores.
responsibility of the user of this standard to establish appro-
3.1.3 surface insulation resistivity, n— the effective resistiv-
priate safety and health practices and determine the applica-
ity of a single insulating layer tested between applied bare
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, 2008. Published December 2008. Originally the ASTM website.
3
published in 1997. Last previous edition approved in 2003 as A976 – 03. DOI: The last approved version of this historical standard is referenced on
10.1520/A0976-03R08. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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A976−03 (2008)
TABLE 1 Classification of Insulating Coatings for Electrical Steels
Coating
Coating Description/Characteristics
Name
C-0 Oxide that is formed naturally on the steel surface during mill processing. This oxide layer is thin, tightly adherent, and provides sufficient insulating quality
for most small cores. The oxide layer will withstand normal stress-relief annealing temperatures. The insulation quality is affec
...
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:A976–97 Designation: A 976 – 03 (Reapproved 2008)
Standard Classification of
Insulating Coatings for Electrical Steels by Composition,
1
Relative Insulating Ability and Application
This standard is issued under the fixed designation A 976; 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 A-6,A06, including Specifications A 345, A 677, A677M, A 683, A683M, A 726, A726M, A 840,
A840M, A876, andA876M. 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.
1.3and A 876. 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.
1.4The values stated in either customary (cgs-emu and inch-pound) units or SI units are to be regarded separately as standard.
Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each
system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this
specification.
2. Referenced Documents
2
2.1 ASTM Standards:
A 345 Specification for Flat-Rolled Electrical Steels for Magnetic Applications
2
A 677Specification for Nonoriented Electrical Steel Fully Processed Types
2
A677MSpecificationforNonorientedElectricalSteel,FullyProcessedTypes(Metric) SpecificationforNonorientedElectrical
Steel Fully Processed Types
2
A 683Specification for Nonoriented Electrical Steel, Semiprocessed Types
2
A683MSpecification for Nonoriented Electrical Steel, Semiprocessed Types (Metric) Specification for Nonoriented Electrical
Steel, Semiprocessed Types
A 717/A 717M Test Method for Surface Insulation Resistivity of Single-Strip Specimens
2
A 726Specification for ColdRolled Magnetic Lamination Quality Steel, Semiprocessed Types
2
A726MSpecification for ColdRolled Magnetic Lamination Quality Steel, Semiprocessed Types (Metric) Specification for
Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed Types
1
This classification is under the jurisdiction of ASTM Committee A-6 on Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on Material
Specifications.
Current edition approved Oct. 10, 1997. Published March 1998.
1
This classification is under the jurisdiction of ASTM Committee A06 on Magnetic Properties and is the direct responsibility of SubcommitteeA06.02 on Material
Specifications.
Current edition approved Nov. 1, 2008. Published December 2008. Originally published in 1997. Last previous edition approved in 2003 as A 976 – 03.
2
Annual Book of ASTM Standards, Vol 03.04.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice
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