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

GB/T 38877-2020 is the English-translated version of 电工钢带（片）绝缘涂层.

GB/T 38877-2020 covers the insulating coatings applied to electrical steel strip and sheet.

Clause 1 states that the standard specifies the terms and definitions, the classification and code, and the testing items and test methods for these coatings, and that it applies to the insulating coating formed by coating and surface oxidation on cold-rolled electrical steel strip (sheet) from inorganic components, organic components and compound preparations of the two.

Its table of contents names clause 4 Classification and code and clause 5 Testing items and test methods, followed by Annex A (informative), which compares domestic and foreign coating classifications and codes, and a bibliography.

Clause 3 defines the coating as a layer of insulating material applied to the surface of the cold-rolled strip (sheet) to prevent or reduce short circuits between core laminations, and defines coated insulation resistance as the resistance corresponding to the current that flows through the coating when a given DC voltage is applied to its surface, noting that it is divided into surface insulation resistance, expressed per face, and interlayer resistance, expressed per sheet.

Clause 4 builds the code in a fixed order from the Chinese Pinyin initials of Dian (electricity) and Jue (insulating), a numeric code for the coating type and, where one exists, a characteristic code in English letters, with the full classification given in Table 1; the standard's own example, DJ-3-Z, denotes a type 3 coating with high surface insulation resistance that greatly improves the punching performance of the strip.

The documents cited show which properties are tested and how, among them GB/T 2522 for interlamination resistance, lamination factor and coating adhesion, GB/T 20831 for assessing the temperature capability of interlaminar insulation coatings, GB/T 1733 for resistance to water, GB/T 6739 for pencil hardness, GB/T 9274 for resistance to liquids, GB/T 9286 for the cross cut test, GB/T 10125 for salt spray testing and GB/T 13501 for insulation compatibility with hermetic refrigeration compressor motors. It was issued on 2 June 2020 and has applied since 1 December 2020.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

GB/T 47916-2026|GB/T 14986.1-2025|GB/T 14986.2-2025|GB/T 6983-2022|GB/T 32288-2020|GB/T 14986.3-2018

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