... . Or Only black Hot Forged Steel Round Bar (C45/SAE8620/16MnCr5)Grade:c45Size:300-1200MM ;Grade:S45CSimilar grade ... customer's requirment;Other specification:Carbon Steel:C45, CK35,C60, C22Alloy Steel: 42CrMo4, 34CrNiMo6,39CrNiMo3,18CrNiMo5,17CrNiMo6,41Cr4,S355J2G3,ST52 ... -3,16MnCr5,20MnCr5,21CrNiMo2. ST52-3,ASTM A105,42CrMo4,S355J2G3,20NiCrMo2,16MnCr5,20MnCr5,34CrNiMo6,18CrNiMo7-6,39CrNiMo3, ...