METHOD FOR MANUFACTURING GRAIN-ORIENTED SILICON STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To provide a method for stably manufacturing a grain-oriented silicon steel sheet having excellent film characteristics. SOLUTION: The method for manufacturing the grain-oriented silicon steel sheet has a series of steps of: hot-rolling silicon-steel stock; subjecting the resultant hot-rolled plate to cold rolling once or two or more times to final sheet thickness while performing process annealing between the cold rolling steps; subjecting the resultant steel sheet to primary recrystallization annealing which doubles as decarburization; applying a separation agent at annealing composed essentially of MgO to the steel sheet and coiling the steel sheet; and then carrying out finish annealing while placing the resultant steel-sheet coil 3 with one edge downside. In this manufacturing method, a cover 8 is provided during the finish annealing in such a way that it comes into contact with the upper edge as the other edge of the above steel-sheet coil 3.