STRIP OR SHEET OF ELECTRIC STEEL WITH UNORIENTED GRAIN STRUCTURE, STRUCTURAL ELEMENT MADE THEREOF AND METHOD OF STRIP OR SHEET PRODUCTION FROM ELECTRIC STEEL WITH UNORIENTED GRAIN STRUCTURE Russian patent published in 2016 - IPC C22C38/14 C21D8/12 

FIELD: technological processes.

SUBSTANCE: invention relates to production of strips or sheets from electrotechnical steel with unoriented grain structure. Method comprises following steps: a) creation of hot-rolled steel strip or sheet, which contains following, wt%: 1.0-4.5 of Si, up to 2.0 of Al, up to 1.0 of Mn, up to 0.01 of C, up to 0.01 of N, up to 0.012 of S, 0.1-0.5 of Ti, 0.1-0.3 of P, iron and unavoidable impurities are rest, wherein for ratio %Ti/%P applies inequality 1.0≤%Ti/%P≤2.0, where %Ti is Ti percentage, in wt% and %P is P percentage, in wt%, b) cold rolling of hot-rolled strip or sheet with production of cold-rolled strip or sheet, c) final annealing of cold-rolled strip or sheet, during which cold-rolled strip or sheet is passed through continuous annealing furnace for two-staged short-term annealing, at which cold-rolled strip or sheet: d.1) is first annealed at first annealing stage for 1-100 s at annealing temperature of, at least 900 °C and not more than 1,150 °C. Then d.2) annealed at second annealing stage for 30-120 s at annealing temperature of 500-850 °C.

EFFECT: technical result consists in improvement of sheet or strip strength with simultaneous low hysteresis losses at high frequencies.

1 cl, 8 tbl