FIELD: metallurgy.
SUBSTANCE: invention relates to the field of metallurgy, namely to a sheet of anisotropic electrical steel used as a material for iron cores of transformers. An electrical steel 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 a tension insulation coating 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 contains as chemical components, 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, 0% or more and less than 0.01% Bi, and the rest is Fe and impurities. When an insulating coating is subjected to elemental analysis using optical glow discharge emission spectrometry in the direction along the thickness of the sheet from the surface of the insulating coating with tension, there are two or more peaks of Si emission intensity, peak A, which is the peak of Si emission intensity, present furthest towards the main steel sheet in the direction along the thickness of the sheet, is present between the point of inflection, in which the rate of increase in the intensity of Fe emission changes in the direction along the thickness of the sheet from the surface of the insulation coating with tension, and the saturation point at which the intensity of Fe emission becomes saturated, and when the length of the perpendicular line drawn from the peak vertex to the baseline connecting the troughs closest to the peak is defined as the peak height, the peak height A is equal to the Si emission intensity in the main steel sheet multiplied by 0.30 or more and 2.5 or less.
EFFECT: sheet has excellent magnetic characteristics and adhesion of the insulating coating.
6 cl, 4 dwg, 1 tbl
