... grade 45# forged steel (plated chrome plating on surface)Rolling galvanization thickness0.05mmProcessing speed 8-12m/minProcessing precision ... forming machines,including molding machine,roof sheet machine,bending machine,C&Z&U shaped purlin forming machine and so on. ... used in various industrial factory,civilian building, warehouse and easy steel building. QJ cnc 850 roof tile used roll forming machine ...