ANISOTROPIC ELECTRICAL STEEL SHEET Russian patent published in 2020 - IPC C22C38/06 C22C38/08 C22C38/16 C22C38/60 C21D8/12 H01F1/147 H01F1/18 C23C22/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to sheet of anisotropic electrical steel used as material of metal core of transformer. Electrotechnical sheet includes a steel sheet, an oxide layer containing SiO₂ and formed on the steel sheet, and an insulating coating with a tension formed on the oxide layer. Steel sheet has chemical composition, wt%: C: 0.085 or less, Si: 0.80–7.00, Mn: 1.00 or less, acid-soluble Al: 0.065 or less, S: 0.013 or less, Cu: from 0 to 0.80, N: from 0 to 0.012, P: from 0 to 0.50, Ni: from 0 to 1.00, Sn: from 0 to 0.30, Sb: from 0 to 0.30, the rest being Fe and impurities. Insulation coating includes chromium compound, and content of Fe in oxide layer and insulating coating is from 70 to 250 mg/m².

EFFECT: sheet has high adhesion of insulation coating.

1 cl, 2 dwg, 2 tbl, 1 ex