| 摘要 |
PURPOSE:To prevent the occurrence of lug cracking, plate break and the like with cold rolling by annealing after both end surfaces of a width direction of a hot rolled plate of silicon steel are ground. CONSTITUTION:At annealing a hot rolled plate of silicon steel, both end surfaces of the width direction of the hot rolled plate are ground by a grinder, etc., or after trimming said plate is ground for annealing. The amount of grinding is approximately 25-500mu and the angle is vertical or within + or -10 deg. against the surface of the plate. After the temperature of annealing is held to be approxi mately 850-1,200 deg.C for 30-300sec, it is cooled at approximately 850-950 deg.C before quick cooling. Therefore, the crystallized particles on the surface of the plate after annealing the hot rolled plate become larger than any other part to reduce the occurrence of the lug cracking and the plate break substantial ly. |
