| 摘要 |
PROBLEM TO BE SOLVED: To easily mass-produce a thin sheet having excellent magnetic properties by executing cold rolling using a sintered body or the like of silicon steel having specified average crystal grain size as the stock, impregnating this rolling stock with Al and executing annealing. SOLUTION: A sintered body or a melted lump of silicon steel of <=300μm average crystal grain size in which the content of Si in Fe is controlled to, by weight, 8.3 to 11.7% and Al to 0 to 2.0% is used as the stock, and this is subjected to cold rolling. The stock sintered body is composed of the one of <=5 mm thickness produced by a powder metallurgy method of executing molding by powder injection molding or the like or a hot molding method such as hot press or the like, and the stock melted lump is the one of <=5 mm thickness cast by a water cooled type mold in which casting thickness is <=5 mm. On both sides of this rolling stock, Al is deposited or film-formed, which is thereafter diffused into the inside by heat treatment, and, simultaneously, the crystal grain size is coarsened to obtain a sendust thin sheet of, by weight, about 2 to 6% Al, about 8 to 11% Si, and the balance Fe.
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