ANISOTROPIC ELECTRICAL STEEL SHEET, A METHOD FOR PRODUCING ANISOTROPIC ELECTRICAL STEEL SHEET AND ANNEALING SEPARATOR USED FOR THE PRODUCTION OF ANISOTROPIC ELECTRICAL STEEL SHEET Russian patent published in 2022 - IPC C21D8/12 C22C38/06 C22C38/60 H01F1/147 H01F1/16 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, namely to a sheet of anisotropic electrical steel. Anisotropic electrical steel sheet contains a basic steel sheet having a chemical composition containing, wt. %: C: 0.005 or less, Si: 2.5-4.5, Mn: 0.02-0.2, one or more elements selected from a group consisting of S and Se: in total 0.005 or less, Al solution: 0.01 or less, N: 0.01 or less, the rest is Fe and impurities, and the primary coating formed on the surface of the main steel sheet and containing Mg₂SiO₄ as the main component. The position of the peak intensity of Al emission obtained by performing elemental analysis using optical emission spectrometry of a glow discharge from the surface of the primary coating in the direction along the thickness of the sheet of anisotropic electrical steel is in the range of 2.4-12.0 mcm from the surface of the primary coating in the direction along the thickness. The numerical density of Al oxides at the peak of the intensity of Al emission with a size of 0.2 mcm or more in terms of the diameter of an area-equivalent circle is 0.03-0.18/mcm ². In the set of Al oxides in the observed region of 30 mcm × 50 mcm at the peak of the intensity of Al emission, the total cross-sectional area of the identified Al oxides with cross-sectional areas of 0.4-10.0 mcm² is 75.0% or more of the total cross-sectional area of all Al oxides in the observed region.

EFFECT: sheet of electrical steel has excellent magnetic properties and adhesion of the primary coating to the main steel sheet, as well as resistance to corrosion.

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