Grain-oriented electrical steel sheet and manufacturing method therefor
A grain-oriented electrical steel sheet according to an embodiment of the present includes Si at 1.0 wt % to 7.0 wt %, C at 0.005 wt % or less (excluding 0 wt %), In at 0.001 wt % to 0.5 wt %, and the remainder including Fe and other impurities unavoidably added thereto.
1. A grain-oriented electrical steel sheet, consisting of:
Si at 1.0 wt % to 7.0 wt %,
C at 0.005 wt % or less (excluding 0 wt %),
In at 0.001 wt % to 0.5 wt %,
Sb at 0.005 wt % to 0.15 wt %,
optionally at least one of Mn, Al, N, S, Sn, P, and Cr, and
the remainder including Fe and other impurities unavoidably added thereto,
wherein a surface roughness (Ra) is 0.1 μm or less.
2. The grain-oriented electrical steel sheet of claim 1 , wherein
Mn at 0.005 wt % to 0.9 wt %, Al at 0.01 wt % to 0.1 wt %, N at 0.015 wt % to 0.05 wt %, and S at 0.03 wt % or less (excluding 0 wt %) are included.
3. The grain-oriented electrical steel sheet of claim 1 , wherein
Sn at 0.005 wt % to 0.2 wt % is included.
4. The grain-oriented electrical steel sheet of claim 1 , wherein
at least one of P at 0.005 wt % to 0.075 wt % and Cr at 0.005 wt % to 0.35 wt is included.
5. The grain-oriented electrical steel sheet of claim 1 , wherein
an area ratio of grains having a particle diameter of 1 mm or less is 10% or less.
6. The grain-oriented electrical steel sheet of claim 1 , wherein C is present in an amount of 30 ppm or less (excluding 0).