Having been rolled in the contoinuous cold-rolling mill and sentto the continu ous hou-dip galvanizing line to wash eiec-trolytically,the strip is first to be annealed in acontinuous an-dip galvanization. The product is finally turned out after passi-vation or skin-pass,stretcher leveling and appropriate means of treatment.The steel base is galvanized,because the zinc canbeformed amembrane on the surfacewhich has good peformance incorroding environmellt.It has not only protected the zinc layer butalso protected the steelbase.So its service life would be extended greatly.It has used with such trades as the architecture Electrical home appliances,auto-mobiloe,receptacle traffic,ete.