... HDP.Standards: JIS G 3312,ASTM A755M,GB/T 12754,Q/CHG 2-2003.Zinc oating:30-275g/m2Color:White,blue ... primarily made of Hot-dipped galvanized steel ,by employing the latest technology and advanced facilities at home and abroad, we first degrease the ... multiple levels, convert them chemically, and then apply precise-coating and rough-coating to the steel sheets, and finally cure(bake)the surface of ...