... , 4140 ,8620, 34CrNiMo6, 18CrNiMo7-6 Shape: free forging Ring/Roller Skype: halenliao607 A105,S355J3G3, 4130, 4140 ,8620, 34CrNiMo6, 18CrNiMo ... /Roller. Material: 1 - Tool Steel: Plastic Mould Steel:1.2311, 1.2738, 1.2083, NAK80, etc.Cold Work Steel: 1.2842, 1.2379, 1.2080, 1. ... 2436, M2, etc.Hot Work Steel: 1.2344, 1.2343,1 ...