The pickled coil is made of high-quality hot-rolled sheet as the raw material, and the oxide layer is removed by the pickling unit. After trimming and finishing, the surface quality and the use requirements (mainly cold-bending or stamping properties) are between the hot-rolled sheet and the cold. The intermediate product between the rolled sheets is an ideal replacement for some hot rolled and cold rolled sheets. Compared with hot-rolled sheets, the advantages of pickling plates are mainly: 1) good surface quality, because the hot-rolled pickling plate removes the surface iron oxide scale, improves the surface quality of the steel, and is convenient for welding, oiling and painting. 2) The dimensional accuracy is high, and after flattening, the plate shape can be changed to some extent, thereby reducing the deviation of the unevenness. 3) Improve the surface finish and enhance the appearance. 4) It can reduce the environmental pollution caused by users' scattered pickling. Compared with cold-rolled sheets, the advantage of pickling boards is that they can effectively reduce the procurement cost while ensuring the requirements for surface quality.