... steel bar Steel grade:S45C Carbon steel: American Standard(AISI/SAE/ASTM) :1010,1015,1025,1035,1045 ... :Chinese Standard:16Mn,20Mn,30Mn2,30Mn5,40Cr,Q345D,Q345E,Q390;42CrMo,20CrMo,38CrMoAl,40CrNiMo;48CrMo,5CrNiMo;Japanese Standard:SCM415, ... SCM420,SCM440,SNCM439,SNCM220; SACM645USA Standard:SAE4140,SAE4130,SAE9840,SAE4340,AISI4145H, ...