Non-directional electrical steel sheet and method for producing same
A non-oriented electrical steel sheet according to one embodiment of the present invention comprises: 1.5 to 4.0 wt % of Si; 0.1 to 1.5 wt % of Mn, 0.7 to 1.5 wt % of Al; 0.0001-0.003 wt % of Bi; and 0.0001 to 0.003 wt % of Ga, with the balance comprising Fe and inevitable impurities, and satisfies the following Formula 1. [Al]+[Mn]≥0.87 [Formula 1] (here, [Al] and [Mn] represent the contents (wt %) of Al and Mn, respectively.)
1 . A non-oriented electrical steel sheet comprising: 1.5 to 4.0 wt % of Si; 0.1 to 1.5 wt % of Mn; 0.7 to 1.5 wt % of Al; 0.0001 to 0.003 wt % of Bi; and 0.001 to 0.0025 wt % of Ga, with the balance comprising Fe and inevitable impurities, and satisfying the following Formulas 1 and 2:
0.87≤[Al]+[Mn]≤3.0, [Formula 1]
wherein [Al] and [Mn] represent the contents wt % of Al and Mn, respectively,
0.0008≤[Bi]+[Ga]≤0.0055, [Formula 2]
wherein [Bi] and [Ga] represent the contents wt % of Bi and Ga, respectively.
2 . The non-oriented electrical steel sheet of claim 1 , further comprising:
one or more of C, S, N or Ti in 0.005 wt % or less, respectively.
3 . The non-oriented electrical steel sheet of claim 1 , further comprising:
one or more of P, Sn or Sb in 0.2 wt % or less, respectively.
4 . The non-oriented electrical steel sheet of claim 1 , further comprising:
one or more of Cu, Ni or Cr in 0.05 wt % or less, respectively.
5 . The non-oriented electrical steel sheet of claim 1 , further comprising:
one or more of Zr, Mo or V in 0.01 wt % or less, respectively.
6 . The non-oriented electrical steel sheet of claim 1 , wherein:
after processing the electrical steel sheet, there is a processing hardening region having the hardness of 10% or more compared to a parent material, and a depth of the processing hardening region is 250 μm or less from a processing surface.
7 . The non-oriented electrical steel sheet of claim 1 , wherein:
after processing the electrical steel sheet, the iron loss W 15/50 of the electrical steel sheet is 2.7 W/Kg or less and the magnetic flux density B 1 is 1.02 T or more.
8 . The non-oriented electrical steel sheet of claim 1 , wherein:
after the electrical steel sheet is processed, the magnetic flux density B 50 is 1.65 T or more.