Galvanized coil is a coil made of cold-rolled or hot-rolled steel plate as the substrate and treated by hot-dip galvanizing or electro galvanizing process. It is widely used in many industries, such as construction, automobile manufacturing, home appliance production, hardware products and so on. It not only ensures the quality and durability of products, but also reduces the later maintenance cost. It is an indispensable basic material in modern industrial production.