Non-oriented electrical steel sheet and method for preparing same
AssigneePosco
InventorsJae-Hoon KIM, Wonjin KIM, Yong-Soo KIM, Su-Yong SHIN
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Abstract
A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes at least one of 2.0 to 3.5% of Si, 0.3 to 3.5% of Al, 0.2 to 4.5% of Mn, 0.0030 to 0.2% of Sn, 0.0030 to 0.15% of Sb, 0.0040 to 0.18% of P, 0.0005 to 0.02% of Zn, and 0.0005 to 0.01% of Y for wt %, a remainder of Fe, and inevitable impurities, and satisfying Formula 1: 0.05≤([Sn]+[Sb])/[P]≤25 [Formula 1] (here, [Sn], [Sb], and [P] represent contents (wt %) of Sn, Sb, and P.)
Claims14
A non-oriented electrical steel sheet comprising:
- at least one of 2.0 to 3.5% of Si, 0.3 to 3.5% of Al, 0.2 to 4.5% of Mn, 0.0030 to 0.2% of Sn, 0.0030 to 0.15% of Sb, 0.0040 to 0.18% of P, 0.0005 to 0.02% of Zn, and 0.0005 to 0.01% of Y, as wt %, a remainder of Fe, and inevitable impurities, and satisfying Formula 1:
- 0.05≤([Sn]+[Sb])/[P]≤25 [Formula 1]
- (here, [Sn], [Sb], and [P] represent contents (wt %) of Sn, Sb, and P.)
A method for manufacturing a non-oriented electrical steel sheet, comprising:
- manufacturing a slab including at least one of 2.0 to 3.5% of Si, 0.3 to 3.5% of Al, 0.2 to 4.5% of Mn, 0.0030 to 0.2% of Sn, 0.0030 to 0.15% of Sb, 0.0040 to 0.18% of P, 0.0005 to 0.02% of Zn, and 0.0005 to 0.01% of Y as a wt %, a remainder of Fe, and inevitable impurities, and satisfying Formula 1;
- heating the slab;
- manufacturing a hot-rolled steel sheet by hot rolling the slab;
- manufacturing a cold-rolled steel sheet by cold rolling the hot-rolled steel sheet;
- and
- finally annealing the cold-rolled steel sheet:
- 0.05≤([Sn]+[Sb])/[P]≤25 [Formula 1]
- (here, [Sn], [Sb], and [P] represent contents (wt %) of Sn, Sb, and P.)
Dependencies are inferred from the claim text.