ASTM A976-2003(2008) Standard Classification of Insulating Coatings by Composition Relative Insulating Ability and Application《与绝缘能力和应用相关的复合绝缘涂层的标准分类》.pdf
《ASTM A976-2003(2008) Standard Classification of Insulating Coatings by Composition Relative Insulating Ability and Application《与绝缘能力和应用相关的复合绝缘涂层的标准分类》.pdf》由会员分享,可在线阅读,更多相关《ASTM A976-2003(2008) Standard Classification of Insulating Coatings by Composition Relative Insulating Ability and Application《与绝缘能力和应用相关的复合绝缘涂层的标准分类》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: A 976 03 (Reapproved 2008)Standard Classification ofInsulating Coatings for Electrical Steels by Composition,Relative Insulating Ability and Application1This standard is issued under the fixed designation A 976; the number immediately following the designation indicates the year oforigi
2、nal 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 ste
3、els 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
4、 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 i
5、n 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 CommitteeA06, including SpecificationsA 345,A 677, A 68
6、3, A 726, A 840, and A 876. However, in thoseinstances in which the coating descriptions and characteristicsdiffer 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
7、be regarded as standard. The values givenin parentheses are mathematical conversions to SI units whichare 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
8、the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A 345 Specification for Flat-Rolled Electrical Steels forMagnetic ApplicationsA 677 Specification for Non
9、oriented Electrical Steel FullyProcessed TypesA 683 Specification for Nonoriented Electrical Steel, Semi-processed TypesA 717/A 717M Test Method for Surface Insulation Resis-tivity of Single-Strip SpecimensA 726 Specification for Cold-Rolled Magnetic LaminationQuality Steel, Semiprocessed TypesA 840
10、 Specification for Fully Processed Magnetic Lamina-tion SteelA 876 Specification for Flat-Rolled, Grain-Oriented,Silicon-Iron, Electrical Steel, Fully Processed TypesA 937/A 937M Test Method for Determining InterlaminarResistance of Insulating Coatings Using Two AdjacentTest Surfaces3. Terminology3.
11、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 A 937/A 937M.3.1.2 stress-relief anneal, nheat treatment that improvesthe magnetic properties of electr
12、ical steel by relieving internalstresses which are introduced during fabrication of magneticcores.3.1.3 surface insulation resistivity, nthe effective resistiv-ity of a single insulating layer tested between applied baremetal contacts and the base metal of the insulated testspecimen, in accordance w
13、ith Test Method A 717/A 717M.4. Significance and Use4.1 This classification establishes categories of insulatingcoatings based on their chemical nature, relative insulatingability, and typical applications. These categories describegeneral physical and chemical characteristics of the coatingsthat ar
14、e useful in making broad estimates of their insulatingability and suitability for various applications.1This classification is under the jurisdiction of ASTM CommitteeA06 onMagnetic Properties and is the direct responsibility of SubcommitteeA06.02 onMaterial Specifications.Current edition approved N
15、ov. 1, 2008. Published December 2008. Originallypublished in 1997. Last previous edition approved in 2003 as A 976 03.2For 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 t
16、o the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Basis of Classification5.1 The insulating coatings are categorized according togeneral composition, relative insulating abili
17、ty, and function-ality (Table 1). The purpose of this classification is to create anomenclature for the various coating types. It is not the intentof this classification to specify coating requirements. Specificproperties required by coating users should be negotiated withthe steel producer.5.2 To r
18、educe confusion regarding the various categories ofcoatings, this classification follows the “C” type of designationinitially used by the American Iron and Steel Institute fordescribing insulating coatings.3The “C” is included in thecoating designation because insulating coatings for electricalsteel
19、s have been historically referred to as “coreplate” coatings.This classification includes new coatings and test methods notincluded in the most recent edition of the AISI classification.Note that the electrical steel committee of theAISI is no longeractive, and the 1983 edition of the coating classi
20、ficationdocument was the last edition of the coating classification to bepublished.46. Test Methods6.1 The surface insulation resistivity of an insulating layermay be measured using Test Methods A 717/A 717M. In thistest method, ten metallic contacts of fixed area are applied toone of the surfaces o
21、f the test specimen, and electrical contactis made with the base metal by two drills (Fig. 1 and Fig. 2).The effectiveness of the coating (surface insulation) then isindicated by a measurement of the average electrical currentflowing between the contacts and the base metal under speci-fied applied v
22、oltage. This current value often is referred to asthe “Franklin Current” and may be used directly as an indicatorof the quality of the insulation. Specifically, a Franklin Currentof zero corresponds to a perfect insulator.AFranklin Current of1 ampere corresponds to a perfect conductor. If desired, a
23、napparent surface insulation resistivity value for the insulatinglayer may be calculated as follows:Ri5 6.45 $1/I!21% in Vcm2/lamination (1)orRi5 645 $1/I!21% in Vmm2/lamination (2)where:Ri= surface insulation resistivity of test sample (two sur-faces in series) in Vcm2/lamination or Vmm2/lamination
24、 andI = ammeter reading in A (also known as Franklin Cur-rent).Note that this test method often is referred to as the Franklintest. The Franklin test is a widely used method for evaluatingthe effectiveness of surface insulation on electrical steels.6.2 The average resistance of two adjacent insulati
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