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GB/T 38877-2020 English PDF (GBT38877-2020)

GB/T 38877-2020 English PDF (GBT38877-2020)

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GB/T 38877-2020: Insulating coatings for the electrical steel strip(sheet)

This Standard specifies the terms and definitions, classification and code, testing items and test methods of insulating coatings for the electrical steel strip (sheet). This Standard is applicable to the insulating coating that is formed by coating on the surface of cold-rolled electrical steel strip (sheet) and surface oxidation through inorganic components, organic components and their compound preparation.
GB/T 38877-2020
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.40
H 53
Insulating coatings for the electrical steel strip (sheet)
ISSUED ON: JUNE 02, 2020
IMPLEMENTED ON: DECEMBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Classification and code ... 5
5 Testing items and test methods ... 7
Annex A (informative) Classification and code comparison of coatings at home and abroad ... 9
Bibliography ... 10
Insulating coatings for the electrical steel strip (sheet)
1 Scope
This Standard specifies the terms and definitions, classification and code, testing items and test methods of insulating coatings for the electrical steel strip (sheet).
This Standard is applicable to the insulating coating that is formed by coating on the surface of cold-rolled electrical steel strip (sheet) and surface oxidation through inorganic components, organic components and their compound
preparation.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1733, Determination of resistance to water of films
GB/T 2522, Magnetic sheet and strip-Methods of measurement of
interlamination resistance and lamination factor and coat adhesiveness
GB/T 6739, Paints and varnishes - Determination of film hardness by pencil test
GB/T 9274, Paints and varnishes - Determination of resistance to liquids GB/T 9286, Paints and varnishes - Cross cut test for films
GB/T 10125, Corrosion tests in artificial atmospheres - Salt spray tests GB/T 13501, Test methods for insulation compatibility of electric motors for hermetic refrigeration compressors
GB/T 20831, Methods of assessment of temperature capability of inter
laminar insulation coatings of electrical sheet and strip
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. 3.1 insulating coatings for the electrical steel strip (sheet)
a coating that in order to prevent or reduce the short circuit between the core laminations and increase the eddy current loss, a layer of insulating properties is coated on the surface of the cold-rolled electrical steel strip (sheet) 3.2 coated insulation resistance
when applying a certain DC voltage to the surface of the cold-rolled electrical steel strip (sheet) coating, the resistance corresponding to the current flowing through the coating
NOTE: Coated insulation resistance is divided into surface insulation resistance (????mm2/face) and interlayer resistance (????mm2/sheet).
4 Classification and code
The code of insulating coatings for the electrical steel strip (sheet) is composed in the order given below. The classification and code of the insulating coating are shown in Table 1. Refer to Annex A for domestic and foreign coating classification and code comparison.
Example:
DJ-3-Z indicates that the type of insulating coating for the electrical steel strip (sheet) is 3, with high surface insulation resistance, which can greatly improve the punching performance of the steel strip.
Table 1 ?€? Classification and description of insulating coatings for the electrical steel strip (sheet)
Coating classification
and code Description
Characteristic code (if any) used by coating, expressed in
English letters
Code of coating type, expressed in numbers
Chinese Pinyin initials of ?€?Dian?€? (electricity) and ?€?Jue?€? (insulating) in "insulating coatings for the electrical steel strip (sheet)"

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