Passing high quality cold rolled steel coil china through a melted zinc bath, in order to coat the steel with a thin layer of zinc to provide corrosion resistance, is called hot dip galvanizing.
Hot dip galvanized coils (GI coils) have many applications in construction/building, roofing, automotive parts, sections, profiled sheets, etc...

As a GI steel coil with spangles in stock supplier you can always contact us for questions about our coil products or pricings.