| 摘要 |
PURPOSE:To obtain a good iron loss characteristic by executing a rapid heating treatment in a specific non-oxidizing atmosphere just before decarburization- annealing to a strip of silicon steel having a fixed composition. CONSTITUTION:Hot-rolled sheet annealing is executed to the hot-rolled grain oriented silicon steel sheet composed of <=0.10wt.% C, 2.5-7.0% Si and the ordinary inhibitor components and the balance Fe with inevitable impurities. Cold rollings at one time or two or more times inserting intermediate annealing are executed and after the decarburization-annealing, the last finishing annealing is applied to make the grain oriented silicon steel sheet. In this manufacturing method, the rapid heating treatment is executed to >=700 deg.C at >=100 deg.C/sec heating speed in the non-oxidizing atmosphere having <=0.2 PH2O/PH2 just before the carburization-annealing to the strip rolled to the finish thickness. By this method, the silicon steel sheet having extremely low iron loss can be obtd. |
