... the substrate through surface pretreatment, coating one or more layers of liquid coating by roll coating, baking and cooling. The ... . It is mainly used as the side door plate of refrigerators, and shell of DVDs, air conditionings, freezers, and washing machines.Number ... deep punching, and ultra-deep punching. Coating and welding performances of alloying hot galvanizing are better.DX52D+Z,DX52D+ZFDX53D+Z ...