ASTM A153/A153M-16a pdf.Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware. ASTM A153/A153M covers zinc coatings applied by the hot-dip process on iron and steel hardware. The hot-dip galvanizing process consists of parts being immersed in molten zinc for a sufficient time to allow a metallurgical reaction between iron from the steel surface and the molten zinc, resulting...