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, 38CrMoAl, 40CrNiMo£» 48CrMo, 5CrNiMo£» Janpan Standard: SCM415, SCM420, SCM440, SNCM439, SNCM220£» SACM645 USA Standard: SAE4140, SAE4130, SAE9840, SAE4340, AISI4145H, SAE4150, SAE8620, Europe Standard: 42CrMo4, 25CrMo4, 34CrNiMo6, 39CrNiMo3, 17NiCrMo6, 18CrNiMo7-6, S355J2G3, ASTM A105, ST52-3, 16MnCr5, 20MnCr5, 16MnCrS5, 20MnCrS5, 21CrMoV511, 56NiCrMoV7, 18NiCrMo5, 30CrNiMo8, 34NiCrMo16, 41CrAlNi7, 34CrAlNi7, B7, B16, F11, F12, F22, F5, F9, 51Cr4. Tool Steel: 1.2714, H13, H11, P20, SKD61£»