Non-oriented electrical steel sheet and method for manufacturing same
AssigneePosco
InventorsHun Ju LEE, Su-Yong SHIN, Yong-Soo KIM
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Abstract
A non-oriented electrical steel sheet according to one embodiment of the present invention comprises, by weight %, 1.5 to 4.0% of Si, 0.7 to 2.5% of Al, 1 to 2% of Mn, 0.003 to 0.02% of Cu, at most 0.005% of S (not 0%), and the remainder comprising Fe and unavoidable impurities, and satisfies formulas 1 and 2 below. 150≤[Mn]/[Cu]≤250 [Formula 1] 3≤[Cu]/[S]≤7 [Formula 2] (here, [Mn], [Cu], and [S] represent Mn, Cu, and S contents (weight %), respectively.)
Claims14
A non-oriented electrical steel sheet comprising, by weight %, 1.5 to 4.0% of Si, 0.7 to 2.5% of Al, 1 to 2% of Mn, 0.003 to 0.02% of Cu, at most 0.005% of S (not 0%), and the remainder comprising Fe and unavoidable impurities, and satisfies formulas 1 and 2 below.
- 150≤[Mn]/[Cu]≤250 [Formula 1]
- 3≤[Cu]/[S]≤7 [Formula 2]
- (here, [Mn], [Cu], and [S] represent Mn, Cu, and S contents (weight %), respectively.)
A method for manufacturing a non-oriented electrical steel sheet which comprises, by weight %, 1.5 to 4.0% of Si, 0.7 to 2.5% of Al, 1 to 2% of Mn, 0.003 to 0.02% of Cu, at most 0.005% of S (not 0%), and the remainder comprising Fe and unavoidable impurities, and satisfies formulas 1 and 2 below, comprising:
- heating a slab satisfying formulas 1 and 2 below;
- preparing a hot rolling sheet by hot-rolling the slab;
- preparing a cold rolling sheet by cold-rolling the hot rolling sheet;
- and
- finally annealing the cold rolling sheet.
- 150≤[Mn]/[Cu]≤250 [Formula 1]
- 3≤[Cu]/[S]≤7 [Formula 2]
- (here, [Mn], [Cu], and [S] represent Mn, Cu, and S contents (weight %), respectively.)
Dependencies are inferred from the claim text.