SHEET UNIORIENTED ELECTROTECHNICAL STEEL AND METHOD OF ITS MANUFACTURE Russian patent published in 2019 - IPC C22C38/06 C21D8/12 H01F1/16 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, in particular to the production of non-oriented electrical steel sheet used as a material for iron cores of electrical equipment. Perform hot rolling of a slab containing C: not more than 0.0050 wt.%, Si: 1.5–5.0 wt.%, Mn: 0.20–3.0 wt.%, soluble Al: not more than 0.0050 wt.%, P: not more than 0.2 wt.%, S: not more than 0.0050 wt.%, N: not more than 0.0040 wt.%, the rest is Fe and inevitable impurities to form a hot rolled sheet. Carry out cold rolling of hot-rolled sheet without performing annealing of hot-rolled sheet, and then the final annealing. Component ratio of CaO in oxide-based inclusions present in a slab, defined as CaO/(SiO₂+Al₂O₃+CaO), set to not less than 0.4 and / or component ratio of Al₂O₃, defined as Al₂O₃/(SiO₂+Al₂O₃+CaO), set to at least 0.3. Temperature of winding into a roll during hot rolling is not less than 650 °C.

EFFECT: achieved non-oriented electrical steel sheet with high magnetic flux density and low iron loss with high recyclability.

4 cl, 1 dwg, 3 tbl, 3 ex