ANISOTROPIC ELECTRICAL STEEL SHEET AND ITS PRODUCTION METHOD Russian patent published in 2022 - IPC C23C22/00 C21D8/12 C22C38/06 C22C38/60 H01F1/147 H01F1/18 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, namely to a sheet of anisotropic electrical steel that does not have an inorganic coating containing forsterite as the main component used as a material of iron cores of transformers. The electrical sheet contains a main steel sheet, a silicon-containing oxide layer provided on the main steel sheet, an iron-based oxide layer provided on a silicon-containing oxide layer, and an insulating coating with tension provided on an iron-based oxide layer having a thickness of 1-3 mcm and containing phosphate and colloidal silica as the main components. The main steel sheet has a chemical composition containing, wt. % 2.5-4.5% Si, 0.05-1.00% Mn, 0% or more and less than 0.05% Al, less than 0.1% C, 0% or more and less than 0.05% N, 0% or more and less than 0.1% S, 0% or more and less than 0.05% Se and 0% or more and less than 0.01% Bi, the rest is Fe and impurities. When performing elemental analysis by optical glow discharge emission spectrometry from the surface of an insulating coating with tension in the direction along the thickness of the sheet, there are four or more inflection points on the Si emission intensity profile, in the direction along the thickness of the sheet, the inflection point of the Si emission intensity closest to the side of the main steel sheet is present within the range of 0.3-1.5 mcm in the side of the insulation coating surface with tension from the saturation point at which the Fe emission intensity is maximum, and the peak of the Si emission intensity, the one closest to the side of the main steel sheet has an emission intensity that is multiplied by 1.3 or more and 2.0 or less than the Si emission intensity in the main steel sheet.

EFFECT: sheet has excellent magnetic characteristics and high adhesion of the insulating coating.

6 cl, 4 dwg, 2 tbl