POSCO Holdings Inc.
Non-oriented electrical steel sheet and manufacturing method therefor

Abstract:

A non-oriented electric steel sheet includes 2.5 wt % to 3.1 wt % of Si, 0.1 wt % to 1.3 wt % of Al, 0.2 wt % to 1.5 wt % of Mn, 0.008 wt % or less of C (excluding 0 wt %), 0.005 wt % or less of S (excluding 0 wt %), 0.005 wt % or less of N (excluding 0 wt %), 0.005 wt % or less of Ti (excluding 0 wt %), 0.001 wt % to 0.07 wt % of Mo, 0.001 wt % to 0.07 wt % of P, 0.001 wt % to 0.07 wt % of Sn, and 0.001 wt % to 0.07 wt % of Sb, in which a remainder includes Fe and inevitable impurities, an average crystal grain diameter is 70 .mu.m to 150 .mu.m, the non-oriented electric steel sheet satisfies Equations (1) and (2), 0.32.ltoreq.([Al]+[Mn])/[Si].ltoreq.0.5 [Equation 1] 0.025.ltoreq.[Mo]+[P]+[Sn]+[Sb].ltoreq.0.15 [Equation 2] (here, a bracket denotes the contents (wt %) of each element).