| 摘要 |
PCT No. PCT/JP86/00300 Sec. 371 Date Jan. 30, 1987 Sec. 102(e) Date Jan. 30, 1987 PCT Filed Jun. 13, 1986 PCT Pub. No. WO86/07390 PCT Pub. Date Dec. 18, 1986.Fe alloy containing Si: 4.0 to 7.0 wt %, Mn: not more than 0.5 wt %, P: not more than 0.1 wt %, S: not more than 0.02 wt %, Al: not more than 2 wt % is molten, and made an ingot or continuously cast into a piece. The piece is subjected to slabbing-roughing, otherwise roughing at temperature of more than 1000 DEG C. and at total reduction of more than 50%, and further a hot finish rolling. The hot finish rolling is performed at temperature of not more than 1100 DEG C. and under a total reduction which is specified by a relation between average grain diameter before the hot finish rolling and Si content, and coiled at temperature of not more than 750 DEG C. after the rolling. The hot rolled plate is performed with cold rolling or warm rolling after the descaling and hot rolled strip annealing. If required, an intermediate annealing is performed in the course of the cold (or warm) rolling.
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