DC01-A: Defects that do not affect the formability or surface coating are allowed, such as air holes, slight dents, small marks, slight scratches and slight coloring. DC01-B: The better surface shall be free of defects that may affect the uniform appearance of high-quality paint or electrolytic coating. The other surface shall meet at least surface quality A. The main application fields of DC01 materials include: automobile industry, construction industry, electronic equipment and household appliances industry, decorative purposes, canned food, etc.