... Screw and Barrel material: bimetallic layer PP,PE,PVC,PET,ABS,PPR for Plastic Extruder Machine Conical Twin Screw and Barrel Zhejiang Bohai ... on the screw's ridge,and uses different alloy and welding methods for the screw of different functions.Materials38CrMoAlA (JIS SACM645 ... .etcApplication PS,HIPS,ABS,SAN,EPN/LDPE,HDPE,UHMPE,EVA,PP,PVC,PMMA,POM,PAST,PET,PBTNitride Depth0.5mm-0.8mmTechnology1 ...