Chinese Standard: 20#, 25#, 35#, 45#, 50#, 60#; Japan Standard: S20C, S25C, S35C, S45C, S55C, S60C; US Standard: AISI1020, AISI1040, AISI1045, AISI1050; Europe Standard: CK15, C. 22, C45, CK45, C60, CK60; C45E; Alloy Steel: Chinese Standad: 16Mn, 20Mn, 30Mn2, 30Mn5, 40Cr,; 42CrMo, 20CrMo, 38C...More