ELECTROTECHNICAL STEEL SHEET WITH ORIENTED GRAIN STRUCTURE Russian patent published in 2020 - IPC C22C38/06 C22C38/08 C22C38/16 C22C38/60 C21D8/12 H01F1/147 H01F1/16 C23C22/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to electrical steel sheet with oriented grain structure used as material of iron core of transformer. Electrotechnical sheet consists of the main steel sheet and amorphous oxide layer formed on the steel sheet. Steel sheet has the following chemical composition, wt%: C: 0.085 or less, Si: 0.80–7.00, Mn: 1.50 or less, acid-soluble Al: 0.065 or less, S: 0.013 or less, Cu: from 0 to 0.80, N: 0 to 0.012, P: 0 to 0.50, Ni: 0 to 1.00, Sn: 0 to 0.30, Sb: 0 to 0.30, rest is Fe and impurities. Value of the NSIC surface obtained by measuring the definition of the surface image using the image definition measuring device is 4.0 % or more.

EFFECT: higher adhesion between sheet surface and insulating coating creating tension.

3 cl, 1 dwg, 2 tbl, 1 ex