ANISOTROPIC ELECTRICAL STEEL SHEET Russian patent published in 2020 - IPC C22C38/00 C23C28/04 C23C8/10 H01F1/18 H01F1/147 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to sheet of anisotropic electrical steel used as material of iron core of transformer. Electrotechnical sheet contains a steel base sheet, an intermediate layer located in contact with the steel base sheet, and an insulating coating located in contact with the intermediate layer and making an external surface. Insulating coating in area in contact with intermediate layer when observed in section parallel to direction of thickness has crystalline phosphide-containing layer, wherein diameter of equivalent circle of crystalline phosphide is on average 5–300 nm when observed in said cross-section. Crystalline phosphide contains at least one selected from a group consisting of FeP, Fe₂P, Fe₃P, FeP₂ and Fe₂P₂O₇, (Fe,Cr)P, (Fe,Cr)₂P, (Fe,Cr)₃P, (Fe,Cr)P₂ and (Fe,Cr)₂P₂O₇.

EFFECT: production of electrotechnical sheet with high homogeneous adhesion of insulating coating.

7 cl, 3 tbl, 1 ex, 3 dwg