Prepainted Galvanised Steel Coil/PPGI/Corrugated Roofing Sheets. Galvanized steel is used to prevent the steel plate surface from corrosion to extend its service life, in the steel plate surface coated with a layer of metal zinc, the zinc coated steel plate are called galvanized sheet.

According to the production and processing methods can be divided into:

• Hot dip galvanized steel: Thin plate in melting zinc bath, make its surface adhesion of a layer of zinc sheet. At present mainly adopts continuous galvanizing process.
• Alloying of galvanized steel: This kind of steel plate is made by hot dip method, but after the slot, immediately heated to a temperature of about 500, it make the generation of zinc and iron alloy membrane. This kind of galvanized sheet has good coating properties and weldability.