Non-oriented electrical steel sheet and method for manufacturing the same
A method for manufacturing a non-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes performing hot rolling on a slab after heating the slab to manufacture a hot rolled sheet; performing hot rolled sheet annealing on the hot rolled sheet; performing cold rolling on a steel sheet on which the hot rolled sheet annealing is completed to manufacture a cold rolled sheet; and performing cold rolled sheet annealing on the cold rolled sheet in which a difference between a cold rolled sheet annealing temperature in the cold rolled sheet annealing and a hot rolled sheet annealing temperature in the hot rolled sheet annealing is 100° C. or lower.
1. A non-oriented electrical steel sheet, consisting of in wt %:
Si: 1.5% to 4.0%, Mn: 0.02% to 3.0%, C: 0.005% or lower, not including 0%, N: 0.005% or lower, not including 0%, and Ti: 0.003% or lower, not including 0%, Al: 0.0005% to 0.02%, Sn: 0.005% to 0.15%, P: 0.001% to 0.15%, S: 0.0008% to 0.015% and Sb: 0.005% to 0.15% and Fe and impurities as a balance amount,
wherein a value of ([Sn]+[Sb]+[P]+20*[S])/[Al] is 40 or higher and wherein [Al], [Sn], [Sb], [P], and [S] refer to weight percent (%) of Al, Sn, Sb, P, and S, respectively, and
wherein in the texture of the non-oriented electrical steel sheet, a volume fraction of a crystal grain having an orientation (30,0,45) as an Euler orientation is 1.5 times higher than a volume fraction of a crystal grain having an orientation (10,0,45) as an Euler orientation.
2. The non-oriented electrical steel sheet of claim 1 , wherein a B r value of the electrical steel sheet is 1.79 T or higher,
wherein B r =7.87/(7.87−0.065*[Si]−0.1105*[Al])*B 50 , [Si] is an added amount wt % of Si and [Al] is an added amount wt % of Al, and B 50 is a value of magnetic flux density induced to the steel sheet when it is exposed to 5,000 A/m.