Grain-oriented electrical steel sheet and method for manufacturing same
A method for manufacturing a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises the steps of: hot-rolling a slab to prepare a hot-rolled sheet, the slab containing, in wt %, 2.0 to 6.0% of Si, 0.04 to 0.12% of Mn, 0.001 to 0.022% of N, 0.027 to 0.060% of C, 0.01 to 0.08% of Nb, 0.01% or less of Ti, and the balance of Fe and other inevitable impurities; cold-rolling the hot-rolled sheet to prepare a cold-rolled sheet; and subjecting the primarily recrystallization-annealed cold-rolled sheet to secondary recrystallization annealing.
1 . A grain-oriented electrical steel sheet, comprising:
in wt %, 2.0 to 6.0% of Si, 0.04 to 0.12% of Mn, 0.0001 to 0.006% of N, 0.005 wt % or less (excluding 0%) of C, 0.01 to 0.08% of Nb, and 0.01% or less, excluding 0%, of Ti, and the balance of Fe and other inevitable impurities, and
a precipitate whose average particle size is 30 nm or less.
2 . The grain-oriented electrical steel sheet of claim 1 , wherein
the precipitate contains Ti, Nb, or a composite thereof.