| 摘要 |
PURPOSE: To easily and stably produce an ultrahigh silicon steel excellent in magnetic properties but difficult to manufacture. CONSTITUTION: A powder mixture is prepared by mixing powdery Fe and Si, containing inevitable impurities, in the proportion where the amount of Si becomes <=7% by weight. This powder mixture is filled into a vessel composed of easily cold-workable metallic material and having a thin layer, facilitating the separation of the powder from the vessel, on the internal surface, in the position between the powder and the vessel. Then, the powder is subjected, together with the vessel, to cold rolling, to cold forging, or to cold drawing. In this method, the draft of the powder layer is regulated to >=70% by reduction of area, and further, annealing is done in the course of or after cold rolling. By this procedure, the ultrahigh silicon steel excellent in soft-magnetic properties can be produced, and also the intermediate product before the annealing and the final product can be produced. By this method, the ultrahigh performance silicon steel sheet having extremely high silicon content, without causing brittle crack, brittle fracture, etc., can be easily produced. |
