| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of obtaining a grain oriented silicon steel sheet having highly stable magnetic properties by means of a manufacturing process where the conventional decarburizing annealing stage by continuous annealing is omitted. SOLUTION: In the ordinary method for manufacturing a grain oriented silicon steel sheet, after or without annealing of a hot rolled plate, the hot rolled plate is cold-rolled twice while in-process annealed between the cold rolling stages to prescribed product sheet thickness. The resultant cold rolled sheet, having a composition consisting of, by weight. 0.005-0.06% C, 2-4% Si, <=0.01% Al, 0.03-0.2% Mn, 0.01-0.04% S or Se, <=0.01% N, and the balance essentially Fe, is subjected, without application of decarburizing annealing, to dry coating with a separation agent at annealing which is composed essentially of alumina and where 0.5-30 wt.% of either or both of Ga compound and Na compound and 0.02-10 wt.% of either or both of Sb compound and Sr compound are added. Then, high temp. batch annealing is performed in a nonoxidizing atmosphere. |
