GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR
A grain-oriented electrical steel sheet according to an embodiment of the present invention includes: in wt %, Si at 1.0 to 7.0%, Mn at 0.5% or less (excluding 0%), Al at 0.005% or less (excluding 0%), S at 0.0055% or less (excluding 0%), one or more of Ba and Y at 0.005 to 0.5%, one or more of Sn at 0.02 to 0.15%, Sb at 0.01 to 0.08%, and Ni at 0.02 to 0.5%, and the balance of Fe and inevitable impurities.
1 . A grain-oriented electrical steel sheet including: in wt %, Si at 1.0 to 7.0%, Mn at 0.5% or less (excluding 0%), Al at 0.005% or less (excluding 0%), S at 0.0055% or less (excluding 0%), one or more of Ba and Y at 0.005 to 0.5%, and
one or more of Sn at 0.02 to 0.15%, Sb at 0.01 to 0.08%, and Ni at 0.02 to 0.5%, and the balance of Fe and inevitable impurities.
2 . The grain-oriented electrical steel sheet of claim 1 , further comprising
one or more of C at 0.005 wt % or less and N at 0.0055 wt % or less.
3 . The grain-oriented electrical steel sheet of claim 1 , wherein
the grain-oriented electrical steel sheet includes Ba at 0.005 to 0.5 wt %.
4 . The grain-oriented electrical steel sheet of claim 1 , wherein
the grain-oriented electrical steel sheet includes Y at 0.005 to 0.5 wt %.
5 . The grain-oriented electrical steel sheet of claim 1 , wherein
the grain-oriented electrical steel sheet includes Ba and Y, and a sum content of Ba and Y are 0.005 to 0.5 wt %.
6 . The grain-oriented electrical steel sheet of claim 1 , wherein
the grain-oriented electrical steel sheet includes one or more of Sn at 0.02 to 0.15 wt %, Sb at 0.01 to 0.08 wt %, and Ni at 0.02 to 0.5 wt %.
7 . The grain-oriented electrical steel sheet of claim 1 , wherein
an area ratio of grains having a grain diameter of 2 mm or less is 10% or less.
8 . The grain-oriented electrical steel sheet of claim 1 , wherein
an average diameter of grains having a grain diameter of 2 mm or more is 1 cm or more.
9 . The grain-oriented electrical steel sheet of claim 1 , wherein
when viewed on a basis of a rolling vertical surface, an average angle formed by a <001> direction of a texture and a rolling direction axis is 3.5 degrees or less.
10 . The grain-oriented electrical steel sheet of claim 1 , wherein
the grain-oriented electrical steel sheet satisfies Formula 1:
0.02≤(0.5×[Sn]+[Sb])<([Ba]+[Y]) [Formula 1]
(in Formula 1, [Sn], [Sb], [Ba], and [Y] mean contents (wt %) of Sn, Sb, Ba, and Y, respectively).
11 . A manufacturing method of a grain-oriented electrical steel sheet, comprising:
heating a slab including: in wt %, Si at 1.0 to 7.0%, C at 0.005 to 1.0%, Mn at 0.5% or less (excluding 0%), Al at 0.005% or less (excluding 0%), S at 0.0055% or less (excluding 0%), one or more of Ba and Y at 0.005 to 0.5%, one or more of Sn at 0.02 to 0.15%, Sb at 0.01 to 0.08%, and Ni at 0.02 to 0.5%, and the balance of Fe and inevitable impurities;
hot-rolling the slab to manufacture a hot-rolled sheet;
cold-rolling the hot-rolled sheet to manufacture a cold-rolled sheet;
primary recrystallization annealing the cold-rolled sheet; and
secondary recrystallization annealing the cold-rolled sheet subjected to the primary recrystallization annealing.
12 . The manufacturing method of the grain-oriented electrical steel sheet of claim 11 , wherein
in the heating of the slab, the slab is heated at 1000 to 1280° C.
13 . The manufacturing method of the grain-oriented electrical steel sheet of claim 11 , further comprising
after the manufacturing of the hot-rolled sheet, annealing the hot-rolled sheet at 900° C. or higher.
14 . The manufacturing method of the grain-oriented electrical steel sheet of claim 11 , wherein
the primary recrystallization annealing is performed at a temperature of 750° C. to 1000° C. for 30 seconds to 30 minutes.
15 . The manufacturing method of the grain-oriented electrical steel sheet of claim 11 , wherein
the secondary recrystallization annealing includes heating and soaking, and
the heating is performed in a hydrogen atmosphere of 90 vol % or more.
16 . The manufacturing method of the grain-oriented electrical steel sheet of claim 11 , wherein
the secondary recrystallization annealing includes heating and soaking, and
a temperature in the soaking is 900 to 1250° C.