... .Standard:AISI, ASTM, DIN, GB, BS, JIS,NF Cast Steel Crankshaft 1.Quality system certificate: ISO 90002. Standard: AISI, ASTM, ... , Precision Casting, Gravity Casting, CNC Machining 9. Material: Carbon Steel , Alloy Steel, Stainless Steel, Gray Iron, Ductile Iron, Aluminum, ect . 10. Surface ... , etc. 12. Your tech drawings , specifications and samples are welcome for customized. Cast Steel Crankshaft