the magnetic properties of non directional silicon steel sheet and the manufacturing method

摘要

A process for producing nonoriented silicon steel sheet having excellent magnetic properties by hot direct rolling, which comprises conducting hot direct rolling of continuously cast slab of silicon steel of a specified composition without heat retention or soaking to depress precipitation of AlN except for unavoidably precipitated AlN in the hot rolling step, providing a stand-by time between the rough rolling step and the finish rolling step to introduce nuclei for precipitation of AlN, and annealing the hot-rolled sheet to precipitate uniform and coarse AlN, thus enabling highly uniform and good ferrite grains to grow upon recrystallization and annealing.