SHEET OF ANISOTROPIC ELECTRICAL STEEL AND METHOD OF FORMING INSULATING COATING Russian patent published in 2024 - IPC C21D8/12 C21D9/46 C22C38/60 H01F1/147 C23C22/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to anisotropic electrical steel sheet with an insulating coating formed on it and methods of its production. Anisotropic electrical steel sheet comprises a main steel sheet; and an insulating coating formed on the surface of the main steel sheet, in which the base steel sheet includes an iron-based oxide layer containing an iron-based oxide on the side of the insulation coating, wherein the insulating coating includes an intermediate layer formed on the side of the main steel sheet and containing crystalline metal phosphate, and a coating layer with tension formed on the surface side of the insulating coating, wherein the average thickness of the iron-based oxide layer is 0.10–1.50 mcm, average thickness of the intermediate layer is 0.3–10.0 mcm, the average thickness of the insulating coating is 2.0–10.0 mcm, crystalline phosphate of the metal of the intermediate layer is one, two or more of zinc phosphate, manganese phosphate, iron phosphate and zinc-calcium phosphate, coating layer with tension contains metal phosphate and silicon dioxide, and amount of silicon dioxide in coating layer with tension is 20–60 wt.%.

EFFECT: improved adhesion of the coating, excellent tension of the coating and excellent magnetic characteristics.

3 cl, 1 dwg