Stainless steel roofing sheet has been used widely in recent years. Jianglin Group has 3 prepainting lines, PE/HDP/PVDF can be available. also, different corrugated molds are also available.
Stainless steel roof sheet seems more expensive. considering the stainless steel value will not decrease fast, after years of usage, the roof material can still be sold in a good price.
Right now, some developed countries like Australia, and Europe start to use prepainted stainless steel coils to do the roof, which can last longer and stronger.