| 简介 |
In this non-oriented electromagnetic steel sheet, the chemical composition thereof contains, in terms of mass%, 0.010% or less of C, more than 3.0% and no more than 5.0% Si, 0.1-3.0% Mn, 0.20% or less of P, 0.0018% or less of S, 0.004% or less of N, 0-0.9% Al, 0-0.100% Sn and/or Sb, 0-5.0% Cr, 0-5.0% Ni, 0-5.0% Cu, 0-0.01% Ca, and 0-0.01% rare earth elements (REM), the remainder comprising Fe and impurities, the area ratio of a crystal structure A composed of crystal grains having a grain diameter of 100 µm or greater in a cross-section parallel to a rolled surface of the non-oriented electromagnetic steel sheet is 1-30%, the average grain diameter of a crystal structure B that is a crystal structure other than the crystal structure A is 25 µm or less, and the Vickers hardness HvA of the crystal structure A and the Vickers hardness HvB of the crystal structure B satisfies the condition HvA/HvB ≤ 1.000. |
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