Non-oriented electrical steel sheet and manufacturing method therefor
A non-oriented electrical steel sheet according to an embodiment of the present invention includes: Si at 1.5 to 4.0 wt %, Al at 0.001 to 0.011 wt %, Mn at 0.05 to 0.40 wt %, S at 0.0001 to 0.01 wt %, As at 0.003 to 0.015 wt %, Mg at 0.0007 to 0.003 wt %, and the balance including Fe and other impurities unavoidably added thereto.
1 . A non-oriented electrical steel sheet, comprising: Si at 1.5 to 4.0 wt %, Al at 0.001 to 0.011 wt %, Mn at 0.05 to 0.40 wt %, S at 0.0001 to 0.01 wt %, As at 0.0034 to 0.01 wt %, Mg at 0.0009 to 0.002 wt %, and the balance including Fe and other impurities unavoidably added thereto,
wherein the non-oriented electrical steel sheet satisfies Formulas 1 and 2:
[As]>[Al], and Formula 1
3×[Mg]>[Al], Formula 2
wherein [As], [Mg] and [Al] are contents (wt %) of As, Mg and Al, respectively,
wherein an average particle diameter of the precipitate of As is 3 to 100 nm,
wherein an average particle diameter of the precipitate of MgS is 3 to 30 nm,
wherein iron loss (W 15/50 ) of the non-oriented electrical steel sheet is 1.5 to 2.15 W/kg, and
wherein iron loss (W 13/50 ) of the non-oriented electrical steel sheet is 1.3 to 1.47 W/kg.
2 . The non-oriented electrical steel sheet of claim 1 , further comprising Sn at 0.02 to 0.09 wt % and Pat 0.01 to 0.15 wt %.
3 . The non-oriented electrical steel sheet of claim 2 , wherein the non-oriented electrical steel sheet satisfies Formula 3:
0.03≤[Sn]+[P]≤0.15 [Formula 3]
(in Formula 3, [Sn] and [P] are contents (wt %) of Sn and P, respectively).
4 . The non-oriented electrical steel sheet of claim 1 , further comprising C at 0.004 wt % or less, Nat 0.003 wt % or less, and Ti at 0.003 wt % or less.
5 . The non-oriented electrical steel sheet of claim 1 , wherein
one or more of Cu, Ni, and Cr are further contained in an amount of 0.05 wt % or less, respectively.
6 . The non-oriented electrical steel sheet of claim 1 , wherein
one or more of Zr, Mo, and V are further contained in an amount of 0.01 wt % or less, respectively.
7 . The non-oriented electrical steel sheet of claim 1 , wherein
a precipitate of As is included at a size of 0.0001 to 0.003 area %.
8 . The non-oriented electrical steel sheet of claim 1 , wherein
a precipitate of MgS is included at a size of 0.0002 to 0.005 area %.
9 . The non-oriented electrical steel sheet of claim 1 , wherein
an average grain size is 60 to 300 μm.