Non-oriented electrical steel sheet and manufacturing method therefor

A non-oriented electric steel sheet comprising:

• 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 %, 0.01 wt % to 0.02 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, wherein a remainder includes Fe and inevitable impurities;
• wherein an average crystal grain diameter of the non-oriented electric steel sheet is 70 μm to 150 μm,
• wherein the non-oriented electric steel sheet satisfies [Equation 1] and [Equation 2],
• 0.32≤([Al]+[Mn])/[Si]≤0.5 [Equation 1]:
• 0.025≤[Mo]+[P]+[Sn]+[Sb]≤0.15 [Equation 2]:
• wherein [Si], [Al], [Mn], [Mo], [P], [Sn], and [Sb] denote the contents in wt % of Si, Al, Mn, Mo, P, Sn, and Sb, respectively,
• wherein W15/50 (punching) of the non-oriented electric steel sheet is 2.01 to 2.07 W/kg;
• wherein inner cross section hardness of the non-oriented electric steel sheet is not more than 210 HV, and
• wherein the inner cross section hardness means an average value obtained by 10 times repeatedly measuring Vickers hardness (HV 25 gf) of a portion except for a crystal grain boundary and an inclusion in a cross section of a point apart from a cut portion formed by a punching process by 5 mm or more under a load of 25 gf.