ASTM_A_976_-_18.pdf

Designation:A97618Standard Classification ofInsulating Coatings for Electrical Steels by Composition,Relative Insulating Ability and Application1This standard is issued under the fixed designation A976;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This document classifies insulating coatings for electri-cal steels according to their composition,relative insulatingability,and functionality.The purpose of this classification is toassist users of insulating coatings by providing general infor-mation about the chemical nature and use of the coatings,aswell as to provide important data concerning limits to their use,that is,relative insulating ability,punchability,temperaturestability,weldability,and fabricability.Specific surface insula-tion resistivity values for each coating are not included in thisclassification.The user is referred to the flat-rolled electricalsteel specifications noted in 1.2 should more detailed informa-tion concerning surface insulation resistivity values be re-quired.1.2 This classification is to be used in conjunction with thevarious specifications for flat-rolled electrical steels under thejurisdiction of Committee A06,including Specifications A345,A677,A683,A726,A840,A876,and A1086.However,inthose instances in which the coating descriptions and charac-teristics differ between this classification and any of thespecifications,this classification shall supersede the specifica-tion.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are mathematicalconversions to customary(cgs-emu and inch-pound)unitswhich are provided for information only and are not consideredstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A340 Terminology of Symbols and Definitions Relating toMagnetic TestingA345 Specification for Flat-Rolled Electrical Steels forMagnetic ApplicationsA677 Specification for Nonoriented Electrical Steel FullyProcessed TypesA683 Specification for Nonoriented Electrical Steel,Semi-processed TypesA717/A717M Test Method for Surface Insulation Resistivityof Single-Strip SpecimensA726 Specification for Cold-Rolled Magnetic LaminationQuality Steel,Semiprocessed TypesA840 Specification for Fully Processed Magnetic Lamina-tion Steel(Withdrawn 2011)3A876 Specification for Flat-Rolled,Grain-Oriented,Silicon-Iron,Electrical Steel,Fully Processed TypesA937/A937M Test Method for Determining InterlaminarResistance of Insulating Coatings Using Two AdjacentTest SurfacesA1086 Specification for Thin-Gauge Nonoriented ElectricalSteel Fully Processed Types3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 interlaminar resistance,nthe average resistance oftwo adjacent insulating surfaces in contact with each other,inaccordance with Test Method A937/A937M.3.1.2 stress-relief anneal,nheat treatment that improvesthe magnetic properties of electrical steel by relieving internalstresses which are introduced during fabrication of magneticcores.1This classification is under the jurisdiction of ASTM Committee A06 onMagnetic Properties and is the direct responsibility of Subcommittee A06.02 onMaterial Specifications.Current edition approved Oct.1,2018.Published October 2018.Originallypublished in 1997.Last previous edition approved in 2013 as A976 13.DOI:10.1520/A0976-18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.1.3 surface insulation resistivity,nthe effective resistiv-ity of a single insulating layer test