| 摘要 |
PURPOSE:To stably manufacture a non-oriented silicon steel sheet excellent in magnetic properties by heating a steel slab having a specified compsn. contg. Si, Al, N, S, C, Mn, Ti, Zr, Nb, V and P to a specified temp. and executing hot rolling. CONSTITUTION:Steel constituted of, by weight, 1.0 to 4.O% Si, 0.001 to 2.0% Al, <=0.0020% N, <=0.0020% S, <=0. 0030% C, 0.1 to 2.0% Mn, 0.003 to 0.010% Ti, <=0.0050% Zr, <=0.0050% Nb, <=0.0050% V, <=0.2% P and the balance Fe with inevitable impurities is melted by a converter and is subjected to continuous casting. The obtd. slab is heated at 1125 to 1300 deg.C in the surface temp. soaked, and thereafter, subjected to hot rolling to a prescribed thickness. The obtd. hot rolled steel strip is, as rolled or after annealing at about 900 to 1000 deg.C, subjected to pickling. Next, the steel strip is subjected to cold rolling for one time or >= two times including a process annealing to regulate its sheet thickness into a final one. The cold rolled steel sheet is subjected to finish annealing at about 1000 to 1100 deg.C. In this way, the non-oriented silicon steel sheet of the highest grade can be obtd. |
