METHOD TO PRODUCE HIGHLY PERMEABLE ANISOTROPIC ELECTRIC STEEL Russian patent published in 2014 - IPC C21D8/12 C22C38/02 C22C38/16 H01F1/16 

FIELD: metallurgy.

SUBSTANCE: steel is smelted, poured to produce a slab, the slab is heated, rough and finishing rolling is carried out, then cooling, etching, double-stage cold rolling with intermediate decarbonising annealing, application of a magnesia coating onto a strip, high-temperature and straightening annealing is carried out, at the same time steel is smelted at the following ratio of components, wt %: C 0.018-0.035, Mn 0.10-0.40, Si 3.0-3.50, Al 0.010-0.035, N₂ 0.008-0.015, Cu 0.4-0.6, balance - iron and unavoidable admixtures, meeting the ratio between carbon and silicon so that the share of austenite during finishing hot rolling in the temperature range of 1150-1050°C makes 2-10%, prior to finishing hot rolling temperature of rolling is maintained in the range 1180-1280°C, and rolling is carried out with total extent of deformation 80-95% and with temperature of rolling end 970-1030°C, strips are cooled after rolling during the time not exceeding two seconds, and heating for high-temperature annealing in the range of temperatures 400-700°C is carried out with speed of 20-25°C/hour.

EFFECT: provision of high magnetic permeability of steel and evenness of magnetic properties of steel.

3 cl, 2 tbl, 3 dwg, 2 ex