Galvanized steel coil is a material produced by continuous hot-dip galvanizing process with hot-rolled steel strip or cold-rolled steel strip as the substrate. The hot-dip galvanized sheet supplied by rectangular plate after cross cutting; Hot dip galvanized coil supplied in coil form after coiling. Therefore, galvanized steel sheets can be divided into hot-rolled galvanized steel sheets and cold-rolled hot-dip galvanized steel sheets, which are mainly used in the fields of construction, household appliances, automobiles, containers, transportation and household industry. Especially in steel structure construction, automobile manufacturing, steel warehouse manufacturing and other industries. Their main characteristics are: strong corrosion resistance, good surface quality, benefit from deep processing, economic and practical.