FIELD: metallurgy.
SUBSTANCE: invention relates to the field of metallurgy, namely, to a method for manufacturing a sheet of electrotechnical steel with an oriented grain structure, used as the material of iron cores of transformers. Method involves the production of a silicon steel material containing, wt.%: Si: 0.8 to 7.0, C: 0.085 or less, acid-soluble Al: 0.010 to 0.065, N: 0.004 to 0.012, Mn: 1.00 or less, S: 0.050 or less, one or both from Sn and Sb: in total 0.01 to 0.20; if necessary, at least one element from the group consisting of the following: Cr: 0.02 to 0.50, Cu: 0.4 or less, P: 0.5 or less, Ni: 1.0 or less, B: 0.008 or less, V: 0.15 or less, Nb: 0.20 or less, Mo: 0.10 or less, Ti: 0.015 or less, Bi: 0.010 or less, the rest Fe and impurities. The resulting material is subjected to hot rolling in order to create a hot-rolled sheet. Cold rolling is performed in order to create a steel sheet of end thickness by single-stage or multi-stage cold rolling with intermediate stages of annealing. Decarbonising annealing is performed using a decarbonising annealing furnace containing a heating area and a sustaining area, wherein the degree of oxidation P1 of the gas atmosphere in the heating area and the degree of oxidation P2 of the gas atmosphere in the sustaining area satisfy the following ratios: 0.01<P1≤0.15, 0.01≤ P2<0.15, and P1>P2. An annealing separator containing aluminium oxide as the base component is applied to the steel sheet, and then the sheet is subjected to final annealing.
EFFECT: created sheet exhibits high magnetic properties.
3 cl, 1 dwg, 6 tbl, 6 ex
