... Heat treatment: annealing, normalizing, carbonitriding,carburizing, tempering6) Precision shot peen gear faces and roots to increase load ... ductile iron specifiedStandardASTM , AISI , BS , DIN , JIS , NFProcessInvestment casting , die casting , gravity casting , sand castingMachiningTurning , milling , drilling , grinding , ... testing, impact testing.CertificateISO9001:2000 / TS16949 High quality gear