bimetallic screw and barrel, bimetallic screw barrel,extruder screws barrels, plastic machinery comoponents Material: 38CrMoALA(JIS SCM645), W6Mo5Cr4V2, GH113, EN41B, 9Cr18MoV, 42CrMo(JIS SCM440), SKD61, Nickel-based Alloy, Co-based Alloy, JPT1, JPT2, JPT3, JPT5 series Technology: PTA spraying, Thermal spraying, fully hardening Hardness: 55HRC-72HRC Alloy thickness: 2.5mm-4mm Used for: Nylon glass fibre, Pcglass fibre, PMMA, Magnetic powder, ceramical powder, iron powder, copper powder, Bakelite