| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for more stably producing a grain oriented silicon steel sheet which has excellent magnetic properties by properly performing final finish annealing using a material containing no inhibitor forming components. <P>SOLUTION: A steel slab having a componential composition containing, by mass, ≤0.08% C, 2.0 to 8.0% Si, and 0.005 to 3.0% Mn, and in which the content of Al is reduced to <100 ppm, and the contents of N, S, and Se are reduced to ≤50 ppm, respectively is hot-rolled, and, is, if required subjected to hot rolled sheet annealing. After that, the steel sheet is subjected to cold rolling for one time or for two or more times including process annealing, and is then subjected to recrystallization annealing. The steel sheet is, if required, coated with a separation agent for annealing, and is then subjected to final finish annealing to produce a grain oriented silicon steel sheet. In this case, as the final finish annealing, holding at least for ≥30 hr in the temperature range higher than the secondary recrystallization starting temperature by 20 to 80°C is performed. <P>COPYRIGHT: (C)2003,JPO |
