HIGH-STRENGTH NON-ORIENTED SILICON STEEL SHEET WITH EXCELLENT MAGNETIC PROPERTY AND FATIGUE CHARACTERISTIC, AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a non-oriented silicon steel sheet which has high strength and excellent magnetic properties and in which sufficiently high fatigue strength can be obtained even in the case of use under a cyclic stress environment and also deterioration in core loss in Cu precipitation treatment can be prevented.;SOLUTION: The steel sheet has a composition consisting of, by mass, ≤0.02% C, ≤4.5% Si, ≤3.0% Mn, ≤3.0% Al, ≤0.50% P, ≤5.0% Ni, 0.2 to 2.5% Cu and the balance Fe with inevitable impurities. Further, Cu precipitates having 1 to 10 nm average particle diameter d_p are incorporated into the steel within the range where their distribution density N satisfies the following inequality: N≥10¹⁴×d_p^-2 (pieces/mm³), where d_p is the average particle diameter (nm) of the Cu precipitates.;COPYRIGHT: (C)2006,JPO&NCIPI