Cold rolled sheet (It is a product made from hot-rolled coil as raw material and rolled below the recrystallization temperature at room temperature. It is commonly used in automotive manufacturing, electrical products, etc. Cold rolling is rolling at the recrystallization temperature, but it is generally understood as rolling with materials rolled at room temperature. Due to the lack of heating during the production process, there are no defects such as pits and iron oxide scales that often occur during hot rolling, and the surface quality is good and the smoothness is high. Moreover, the size of cold rolled products is fine.) High degree, the performance and organization of the product can meet some special usage requirements, such as electromagnetic performance, deep drawing performance, etc.