Automobile steel plate, generally refers to the automobile manufacturing steel, it is mainly composed of plate and special steel, with high strength, thin specifications and corrosion resistance characteristics, high level of production technology, belongs to high value-added products. Compared with ordinary steel such as construction steel, automotive steel is a high value-added product, mainly reflected in the following aspects: (1) high technical content. With the continuous improvement of the level of automotive products, the requirements for automotive steel are also increasing. First of all, in order to reduce the weight of automotive products, save materials, reduce fuel consumption, reduce costs, and improve safety standards, it is necessary to use high-strength and thin specifications of steel. Secondly, in order to improve the anti-corrosion performance of automotive products and extend the service life of automobiles, it is necessary to improve the surface treatment techno…