... , DIN, GB, BS, JIS, NF, AAR Investment Casting of Suspension Parts for Trailers 1.Quality system certificate: ISO 90002. Standard: AISI, ASTM ... Casting , Sand Casting, Die Casting, Lost Wax Casting, Precision Casting, Gravity Casting, CNC Machining 9. Material: Carbon Steel , Alloy Steel, Stainless Steel ...