ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PREPARING SAME

1 . An oriented electrical steel sheet, comprising, in a unit of wt %, Si at 1.0 wt % to 5.0 wt %, C at 0.005 wt % or less (excluding 0 wt %), Mn at 0.001 wt % to 0.1 wt %, Cu at 0.001 wt % to 0.1 wt %, S at 0.001 wt % to 0.020 wt %, Se at 0.001 wt % to 0.050 wt %, Al at 0.0005 wt % to 0.010 wt %, N at 0.0005 wt % to 0.005 wt %, and the remainder of Fe and inevitable impurities,

wherein the oriented electrical steel sheet satisfies Equation 1:

16≤(10×[Mn]+[Cu])/([S]+[Se])+(0.02−[Al])/[N]≤20   [Equation 1]

(in Equation 1, [Mn], [Cu], [S], [Se], [Al], and [N] represent contents (wt %) of Mn, Cu, S, Se, Al, and N, respectively.)

2 . The oriented electrical steel sheet of claim 1 , wherein

the oriented electrical steel sheet satisfies Equation 2:

0.016≤[S]+[Se]≤0.05   [Equation 2]

(in Equation 2, [S] and [Se] represent contents (wt %) of S and Se, respectively.)

3 . The oriented electrical steel sheet of claim 1 , wherein

the oriented electrical steel sheet satisfies Equation 3:

0.5≤[Al]/[N]≤3.0   [Equation 3]

(in Equation 3, [Al] and [N] represent contents (wt %) of Al and N, respectively.)

4 . A preparing method of an oriented electrical steel sheet, comprising:

preparing a slab including, in a unit of wt %, Si at 1.0 wt % to 5.0 wt %, C at 0.001 wt % to 0.10 wt %, Mn at 0.001 wt % to 0.1 wt %, Cu at 0.001 wt % to 0.1 wt %, S at 0.001 wt % to 0.020 wt %, Se at 0.001 wt % to 0.050 wt %, Al at 0.0005 wt % to 0.010 wt %, N at 0.0005 wt % to 0.005 wt %, and the remainder of Fe and inevitable impurities, and satisfying Equation 1;

heating the slab;

hot rolling the slab to prepare a hot rolled sheet;

cold rolling the hot rolled sheet to prepare a cold rolled sheet;

primary recrystallization annealing the cold rolled sheet; and

secondary recrystallization annealing the cold rolled sheet in which the primary recrystallization annealing is completed:

16(10×[Mn]+[Cu])/([S]+[Se])+(0.02−[Al])/[N]≤20   [Equation1]

(in Equation 1, [Mn], [Cu], [S], [Se], [Al], and [N] represent contents (wt %) of Mn, Cu, S, Se, Al, and N, respectively.)

5 . The preparing method of the oriented electrical steel sheet of claim 4 , wherein

the heating of the slab includes heating the slab at 1000 to 1250° C.

6 . The preparing method of the oriented electrical steel sheet of claim 4 , wherein

the cold rolled sheet in which the primary recrystallization annealing is completed includes one or more precipitates of (Fe,Mn,Cu)S and (Fe,Mn,Cu)Se.

7 . The preparing method of the oriented electrical steel sheet of claim 4 , wherein

the primary recrystallization annealing is performed in a hydrogen and nitrogen mixed atmosphere at a dew point temperature of 50° C. to 70° C.