... :Chinese Standad:16Mn,20Mn,30Mn2,30Mn5,40Cr,Q345D,Q345E,Q390;42CrMo,20CrMo,38CrMoAl,40CrNiMo;48CrMo,5CrNiMo;Janpan Standard:SCM415,SCM420,SCM440 ... Standard:SAE4140,SAE4130,SAE9840,SAE4340,AISI4145H,SAE4150,SAE8620,Europe Standard:42CrMo4,25CrMo4,34CrNiMo6,39CrNiMo3,17NiCrMo6,18CrNiMo7-6,S355J2G3,ASTM A105,ST52 ... :Jiangsu Zhuhong Forging Co.,Ltd forgings steel bar SAE8620/21CrNiMo2/42CrMo