Patent ID: 6406558
Filing Date: 2002-06-18
Classification: C21D,C22C

Abstract:
A method for manufacturing a non-oriented magnetic steel sheet having superior workability and superior magnetic properties after stress relief annealing, comprising the steps of:hot rolling a steel slab containing about 0.001 to 0.03 wt % carbon, about 0.1 to 1.0 wt % silicon, about 0.01 to 1.0 wt % aluminum, about 0.05 to 1.0 wt % manganese, and about 0.001 to 0.15 wt % phosphorus; cold rolling the hot rolled sheet; continuous annealing the cold rolled sheet; and skin pass rolling the annealed sheet; wherein the average cooling rate in the continuous annealing process is about 10Â° C./second or more; and wherein said skin pass rolling of said sheet is conducted at a reduction rate of about 0.5 to 5% within about 20 hours after continuous annealing.