Non Oriented Electromagnetic Steel Sheet, Motor Core, And Methods For Producing Same

Abstract: A non-oriented electromagnetic steel sheet, wherein: the chemical composition of a base material, in mass%, is not more than 0.0050% C, more than 3.70% but not more than 4.60% Si, more than 0.20% but not more than 0.50% Mn, 0.23-0.75% Al, not more than 0.030% P, not more than 0.0018% S, not more than 0.0040% N, 0.005-0.040% Sn, 0-0.040% Sb, the remainder being Fe and impurities, with [4.2=Si+Al+0.5×Mn=4.9] being satisfied; the N content [N]s at a position 20 µm from the surface of the base material in the depth direction is not more than 0.0060%; the base material has an average crystal grain size of 10-30 µm; iron loss W10/400 is not more than 20.0 W/kg; saturation magnetic flux density is not less than 1.945 T; tensile strength is not less than 680 MPa; and thickness is 0.10-0.30 mm.

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