Galvanized coil, the thin steel plate immersed in the melting of the zinc tank, so that the surface adhesion of a layer of zinc steel sheet. At present, the continuous galvanizing process is used to produce the continuous steel sheet. This steel sheet is also manufactured by a hot-dip method. However, immediately after the trough is heated to about 500 ° C, zinc and iron are produced . Galvanized coil has good adhesion and weldability of the coating.