... barrel,screw barrel parallel twin screw barrel,screw barrelMaterial: 38CrMoALA(JIS SCM645), W6Mo5Cr4V2, GH113, EN41B, ... Hardness: HRC55-72 Alloy thickness: 2.5mm-4mm Used for: Nylon glass fibre, Pcglass fibre, PMMA, Magnetic powder, ceramical powder, iron ...