Non Oriented Electromagnetic Steel Sheet, Iron Core And Motor Core, And Method For Manufacturing Iron Core And Motor Core

Abstract: Provided is a non-oriented electromagnetic steel sheet comprising a base steel plate and an insulating coating formed on the surface of the base steel plate, wherein the base steel plate has a chemical composition containing, in mass%, 0.0030% or less of C, 3.2-6.5% of Si, 0.05-3.5% of Mn, 0.005-0.10% of P, 0.0030% or less of S, 1.0% of less of Al, 0.0030% or less of Ti, 0.0010% or less of B, 0.030% or less of Mo, 0.0010% or less of V, 0-0.0050% of Ca, 0-0.0050% of Mg, and 0-0.0050% of REM, with the remainder comprising Fe and impurities, the chemical composition satisfying [S-5/3×Mg-4/5×Ca-1/4×REM<0.0005], and the insulating coating has a chemical composition satisfying [[M]-[C]+1/2×[O]>0].

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