SHEET OF ANISOTROPIC ELECTROTECHNICAL STEEL AND METHOD FOR MANUFACTURE THEREOF Russian patent published in 2022 - IPC C21D8/12 C23C22/00 H01F1/147 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely, to a sheet of anisotropic electrotechnical steel. Sheet of anisotropic electrotechnical steel comprises a base steel sheet, a primary forsterite-based film located on the surface of the base steel sheet, and a phosphate-based chromium-free tensioning film located on the surface of the primary film. In the case when the content of Ti and the content of S in the primary forsterite-based film are expressed as XTi and XS, respectively, in wt.%, the following ratios are true: 0.10 ≤ XTi/XS ≤ 10.00 and XTi+XS ≥ 0.10 wt.%. Magnetic domains are controlled due to the introduction of deformations. In the method for producing a sheet of anisotropic electrotechnical steel, including the stages of hot rolling, annealing of the hot-rolled steel sheet, cold rolling, decarbonisation annealing of the cold-rolled steel sheet, final annealing with applying an annealing separator onto the surface of the sheet and producing a primary forsterite-based film by heating, formation of a tensioning film with applying and calcining a coating liquid on the surface of the steel sheet subjected to the final annealing, forming a phosphate-based chromium-free tensioning film. The stage of controlling the magnetic domains is then conducted by introducing deformations into the steel sheet whereon the phosphate-based chromium-free tensioning film is formed by laser irradiation or electronic heating in the direction perpendicular to the rolling direction.

EFFECT: creation of a sheet of anisotropic electrotechnical steel.

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