... aluminum 3.ISO 9000 4.Standard: AISI, ASTM, DIN, GB, BS, JIS, NF, AAR Investment Casting of Suspension Parts for Trailers ... Carbon Steel , Alloy Steel, Stainless Steel, Gray Iron, Ductile Iron, Aluminum, ect . 10. Surface Treatment: Heat Treatment, Machine, Polishing, ... Chrome, Zinc, Nickel Plating 11.These parts are used in machine assembly, valve &pump parts, auto &motorcycle parts, ...