Hot rolled coils, cold rolled coils is as raw materials, at a temperature below room temperature the recrystallization rolling from, is rolling recrystallization, it is generally understood as the use of ambient temperature of the rolled material rolled aluminum cold rolling rolling and foil rolling into plate thickness of 0.15-0.18 above is called plate, 0.15 to hereinafter referred to as a foil in Europe and America use more 3-6 sets in a row as the cold rolling mill equipment. Has the following characteristics: (1) have good durability, longer life compared with galvanized steel; (2) has good heat resistance, compared with galvanized steel at high temperature are less likely to change color; ( 3) has a good heat reflective; (4) has a gorgeous silver-white surface; (5) has a galvanized steel similar processing performance and spray performance; (6) has good weldability.