| 摘要 |
PROBLEM TO BE SOLVED: To obtain a grain oriented silicon steel sheet stable in quality characteristics, at the time of producing a grain oriented silicon steel sheet having specified C and Si contents, by measuring the core loss of a steel sheet between passes in cold rolling in online and controlling rolling conditions by a feedback from the measured result. SOLUTION: A slab for a grain oriented silicon steel sheet contg., by weight, 0.02 to 0.12% C and 2.5 to 4.5% Si is subjected to hot rolling at about >=1350 deg.C, and this hot rolled sheet is, if required, heated at about 900 to 1200 deg.C, is rapidly cooled, is annealed and is subjected to cold rolling for one time or plural times including process annealing to produce a grain oriented silicon steel sheet. At this time, in the meantime between passes or after the final pass in the cold rolling, the iron loss of this steel sheet is measured in online, and by the measured result, by a feedback or a feedforward, the rolling conditions (one or more among the rolling rate, rolling pass schedule, coolant flow rate and coolant temp.) are controlled. In this way, the grain oriented silicon steel sheet remarkably improved in quality characteristics and the dispersion thereof can be obtd. |
