... 38CrMoAlA; SKD61; SKD11.etc. screw barrel for plastic injection moulding machine We ,Lucheng screw Machinery Factory, ... specialized in the field of injection and extruder machine parts.Our main types of screw ... PTFE, PR, UP, PEC, PF, VF, MP, PMMA, PET, PBT, PPS, MPPO, PI, LCP, etc.. ... Material: 38CrMoAlA; SKD61; SKD11; 40Cr; 42CrMo; high quality alloy steelTechnology: nitriding treatment, alloy coating ...