The rolling of silicon steel sheets is mainly divided into hot rolling and cold rolling. The hot-rolled silicon steel sheet is obtained by melting a ferrosilicon alloy in an open hearth or an electric furnace, repeatedly hot rolling into a thin plate, and finally annealing at 800-850 °C. Hot-rolled silicon steel sheet is mainly used for the manufacture of generators, so it is also called silicon steel sheet of hot-rolled motor, but its low utilization rate and high energy loss have been forced to eliminate in recent years. Of course, hot rolling can also roll some non-oriented silicon steel which is not required, and can be used as a blank material for rolling oriented silicon steel. The hot-rolled steel coil is used as a raw material, and the scale is removed by pickling, followed by cold continuous rolling, and the finished product is a rolled hard roll, and after a certain heat treatment, a well-oriented oriented silicon steel is obtained. Compared with hot-rolled silicon-free steel sheets, the orientation of silicon steel has a strong directionality; it has superior magnetization and low energy loss in this rolling direction. The iron loss of the oriented silicon steel sheet in the direction of easy magnetization is about 1/3 of the lateral direction, while the magnetic permeability is 6 times of that, and the iron loss is only 1/2 of that of the hot rolled silicon steel sheet, and the magnetic permeability is Hot rolled silicon steel 2.5 times.