METHOD FOR PRODUCING TEXTURED SILICON STEEL WITH LOW LOSS IN IRON BY ANNEALING FOR STRESS RELIEF Russian patent published in 2021 - IPC C21D8/12 B23K26/364 

FIELD: metallurgy.

SUBSTANCE: invention relates to a method for producing a sheet from stress-relieved grain-oriented silicon steel. Iron smelting for silicon steel, steel smelting, continuous casting, hot rolling, single or double cold rolling, followed by decarburization annealing are carried out. The surface of the steel is coated with an MgO-based release agent, high-temperature annealing is performed, an insulating coating is applied, and hot drawing, tempering and annealing are performed to obtain a grain-oriented silicon steel sheet. By scanning with a pulsed laser, notches are formed on one or both surfaces of the obtained steel sheet. The notches are formed parallel to each other in the rolling direction of the steel sheet. Pulsed laser scanning is performed with a pulse width of 100 ns or less for a single pulse of a pulsed laser, a peak energy density of a single pulse of 0.05 J / cm² or more, an energy density of a single laser beam in one scan, Es, of 1 J / cm² to 100 J / cm².

EFFECT: reduction in thermal influence is provided during laser cutting and there is no distortion of the shape of the sheet, while the resulting steel sheet is characterized by a noticeable thinning effect of the magnetic domain, low losses in iron and no decrease in lamination coefficients.

5 cl, 1 dwg, 6 tbl, 3 ex