| 摘要 |
PURPOSE: A non-oriented magnetic steel sheet is provided which lowers iron loss and improves magnetic flux density by properly controlling contents of C and P, and a method for manufacturing the non-oriented magnetic steel sheet is provided. CONSTITUTION: The non-oriented magnetic steel sheet with excellent magnetism comprises 0.0010 to 0.0025 wt.% of C, 1.0 to 4.5 wt.% of Si, 0.5 wt.% or less of Mn, 0.005 wt.% or less of P, 0.005 wt.% or less of S, 0.2 to 1.5 wt.% of Al, 0.003 wt.% or less of N and a balance of Fe and other inevitable impurities. The method for manufacturing the non-oriented magnetic steel sheet with excellent magnetism comprises the steps of hot rolling the reheated steel slab after reheating a steel slab comprising 0.0010 to 0.0025 wt.% of C, 1.0 to 4.5 wt.% of Si, 0.5 wt.% or less of Mn, 0.005 wt.% or less of P, 0.005 wt.% or less of S, 0.2 to 1.5 wt.% of Al, 0.003 wt.% or less of N and a balance of Fe and other inevitable impurities; annealing the coiled hot rolled steel sheet at a temperature of 900 to 1,100 deg.C after coiling the hot rolled steel sheet at a temperature of 700 deg.C or less; cold rolling the annealed steel sheet by one cycle cold rolling process or two cycle cold rolling process comprising first cold rolling, intermediate annealing and second cold rolling processes; and annealing the cold rolled steel sheet at a temperature of 950 to 1,100 deg.C.
|
