The magnetism, surface quality, filling factor and punchability of

 cold-rolled silicon steel sheets are better than those of hot-rolled 

silicon steel sheets, and they can be produced in coils. Therefore, some 

countries have stopped producing hot-rolled silicon steel sheets since 

the 1960s. China adopts a low temperature of about 900 ℃ 

one-time rapid hot rolling and stacking annealing under the protection 

of hydrogen to manufacture hot-rolled silicon steel sheets. The yield is 

high, and the surface quality and magnetic properties of the 

finished products are good.

The oxides of the hot-rolled steel strip are removed by the descaling

 machine and the hydrochloric acid tank to prevent surface 

defects of the cold-rolled finished product.

In order to ensure the thickness and material for different purposes, 

the deceleration ratio is set at 40%-90%, and advanced control equipment 

such as automatic thickness control and automatic shape control is realized.

It is a process of softening the material of the steel strip hardened in the 

cold stamping process. Through metal heating and rapid cooling, 

steel for deep processing and high-tensile steel are produced, and 

boxing (cover annealing) annealing and continuous 

annealing methods are adopted.

When the silicon steel plate is processed into an iron core, in order

 to improve its processing performance and prevent eddy current 

loss equivalent to the multiplication of the thickness of the steel plate, 

continuous coating equipment is used to spray insulating coating 

liquid on the upper and lower sides of the steel plate.