MAIN SHEET FOR SHEET OF ANISOTROPIC ELECTROTECHNICAL STEEL, SHEET OF ANISOTROPIC SILICON STEEL USED AS MATERIAL OF MAIN SHEET FOR SHEET OF ANISOTROPIC ELECTROTECHNICAL STEEL, METHOD FOR PRODUCING THE MAIN SHEET FOR SHEET OF ANISOTROPIC ELECTROTECHNICAL STEEL, AND METHOD FOR PRODUCING SHEET OF ANISOTROPIC ELECTROTECHNICAL STEEL Russian patent published in 2021 - IPC C23C22/00 C23C22/82 C21D8/12 C21D9/46 H01F1/147 

FIELD: metallurgy.

SUBSTANCE: group of inventions relates to the main sheet for a sheet of anisotropic electrotechnical steel, an application of a sheet of anisotropic silicon steel, methods for producing said main sheet and a sheet of anisotropic electrotechnical steel. In the main sheet for a sheet of anisotropic electrotechnical steel, the amount of surface oxygen x per one surface of the main sheet and the value y of the peak of SiO₂ on the surface of the base sheet, obtained using the infrared reflectance spectroscopy by calculating the average value of ∆R/R₀, wherein ∆R is the difference in the intensity between the top and the background of the peak, R₀ is the background height in the position of 1,250 cm^-1 of the absorption peak, satisfy the conditions y ≥ 1,500x^2,5 and y ≥ 0.24. At a holding temperature of 1,000°C or lower, an oxidised layer containing predominantly SiO₂ can be formed externally on the surface of the main sheet for a sheet of anisotropic electrotechnical steel, capable of stably providing sufficient adhesion of the coating with tension while avoiding introduction of stress into the main sheet.

EFFECT: provided is a sheet of anisotropic electrotechnical steel with a stable and good adhesion of the coating with tension.

6 cl, 3 dwg, 3 tbl, 3 ex