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you are here:BEBON STEEL > Introduction of Base MetalsIntroduction of Base Metals

The base metals for prepainted steel sheet consist of cold-rolled, HDG electro-galvanized and hot-dip alu-zinc coated steel sheet.
Cold-rolled base metal
The prepainted steel sheet processed with cold-rolled base metal features in its smooth and beautiful appearance and the machinability of cold rolled steel sheet, however, in case of any tiny scratch on the top coating may expose the cold rolled base metal in the air and the exposed base metal may rust soon.Thus, the products of this kind can only be used as temporary isolation measures and indoor materials with low requirements.
Hot-dip zinc coated base metal
The prepainted steel sheet with hot-dip zinc-coated base metal as its base metal not only has the protective function of zinc coating but also has an isolation and protection function with its organic layer that prevents it from rusting and prolongs its service span longer, than that of hop-dip zinc steel sheet. The zinc content of hop-dip zinc base metal is generally 180 per 1 square meters(both sides), while that of the hot-dip zinc base metal for construction outdoors is 275 square meters per 1square meters.
Hop-dip alu-zinc base metal
The hop-dip alu-zinc base metal adopts the hot-dip zinc- aluminum coated steel sheet (55%AI-Zn) as its prepainted base metal. The corrosive resistance of the hot-dip alu-zinc coated steel sheet is twice to 5 times as much as that of the hot-dip zinc- coated base metal.It can satisfy the processing requirements of rolling, coiling and others processes alike.Its color won’t change while continuously or intermittently working with an ambient temperature up to 316. Neither serious oxygenation nor oxide scale might appear while continuously or intermittently working with an ambient temperature up to 490. Its heat and the light reflected are respectively twice as much as those of hot-dip zinc steel sheet, and its reflectivity is more than 0.75, exceeding 0.65(required by the EPA Energy Star Standard), which is an ideal construction materials of saving energy.
Electro-galvanized base metal
The prepainted electro-galvanized steel sheet adopts an electro- galvanized base metal coated and baked with an organic coating. Owing to the thin zinc-coated layer of the electro-galvanized base metal, the zinc content of the prepainted steel sheet of electro-galvanized base metal is usually 20/20g/m2, and the products of this kind are not suitable for building walls or roofs outdoors. However, it has esthetic appearance and excellent machinability, which makes it suitable for electrical household appliances, acoustic devices, steel household appliances, interior decoration, etc.

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