SHEET FROM ELECTROTECHNICAL STEEL WITH ORIENTED GRAIN STRUCTURE Russian patent published in 2021 - IPC C21D8/12 C22C38/02 C22C38/60 C23C22/00 H01F1/18 

FIELD: technological processes.

SUBSTANCE: invention relates to sheet of electrical steel with oriented grain structure, which is used as material of iron core of transformer or generator. Sheet from electrical steel with oriented grain structure contains base steel sheet, a lower layer in contact with the base steel sheet, and an insulating coating in contact with the lower layer and containing phosphate and colloidal silicon oxide as main components. Base steel sheet has the following chemical composition, wt%: 0.085 or less of C, 0.80-7.00 Si, 0.05-1.00 Mn, 0.010-0.065 Al, 0.0040 or less of N, 0.015 or less of Seq, where Seq=S+0.406⋅Se, 0.0005-0.0080 B, balance - Fe and impurities. Basic steel sheet contains compound B, the length of main axis of particles of which is 1-20 mcm and numerical density of particles of which is 1×10-1×10⁶ particles/mm³. Said lower layer is a glass film which, as a main component, contains forsterite or an intermediate layer as a main component contains silicon oxide.

EFFECT: invention provides high magnetic flux density and very low losses in the core.

4 cl, 2 dwg, 6 tbl, 4 ex