HIGH-STRENGTH NON-ORIENTED MAGNETIC STEEL SHEET

摘要

This high-strength non-oriented magnetic steel sheet contains, in mass%, 0.010% or less of C, 2.0-4.0% (inclusive) of Si, 0.05-0.50% (inclusive) of Mn, 0.2-3.0% (inclusive) of Al, 0.005% or less of N, 0.005-0.030% (inclusive) of S and 0.5-3.0% (inclusive) of Cu, with the balance made up of Fe and unavoidable impurities. This high-strength non-oriented magnetic steel sheet satisfies formula (1) when the Mn content is represented by [Mn] and the S content is represented by [S], and contains sulfides having circle-equivalent diameters of 0.1-1.0 µm (inclusive) at a density from 1.0 × 104 pieces/mm2 to 1.0 × 106 pieces/mm2 (inclusive). 10 = [Mn]/[S] = 50 (1)