| 摘要 |
PURPOSE:To provide a method advantageously suited for the improvement in the surface characteristics of a grain-oriented silicon steel sheet used mainly for iron core material for electrical equipment, such as transformer. CONSTITUTION:Prior to the execution of hot rolling for a continuously cast slab of a silicon-containing steel having a composition containing at least 0.01-0.06% sol.Al and 0.0030-0.0120% N as inhibitor forming components, the slab is heated up to 1000-1300 deg.C, rolled at <=2% reduction of area, and heated up to a temp. in a high temp. region of >=1300 deg.C, by which micropores formed in the vicinity of inclusions entrapped in the course of continuous casting can be effectively crushed and the nuclei of cracking can be removed. By this method, a product free from surface defects can be obtained. |
