... 1.5~34) Processing: precision hot and cold forging, precision machining and roll forming5) Heat treatment: annealing ... ductile iron specifiedStandardASTM , AISI , BS , DIN , JIS , NFProcessInvestment casting , die casting , gravity casting , sand castingMachiningTurning , milling , drilling , grinding , threading , CNC ... testing, impact testing.CertificateISO9001:2000 / TS16949 High quality gear