The performance requirements for silicon steel are mainly: ① Low iron loss, which is an important indicator of the quality of silicon steel sheets. Countries all classify grades according to the iron loss value. The lower the iron loss, the higher the grade. ② The magnetic induction intensity (magnetic induction) is high under a strong magnetic field, which reduces the volume and weight of the cores of motors and transformers, saving silicon steel sheets, copper wires, and insulating materials. ③The surface is smooth, flat and uniform in thickness, which can improve the filling factor of the core. ④Good punching properties are more important for manufacturing micro and small motors. ⑤The surface insulating film has good adhesion and weldability, can prevent corrosion and improve punching properties.