... 4130, 4140 ,8620, 34CrNiMo6, 18CrNiMo7-6 Shape: free forging Ring/Roller Skype: halenliao607 A105,S355J3G3, 4130, 4140 ,8620, 34CrNiMo6, 18CrNiMo 7 ... -6 free forging Ring/Roller. Material: 1 - Tool Steel: Plastic Mould Steel:1.2311, ... 2714 etc.2- Carbon Structure Steel: Ck45, 1055 etc.3- Bearing Steel: SAE52100, 9260(60SiMn5), 38Si7etc.4- Alloy Structure Steel: ...