... PP,PE,PVC,PET,ABS,PPR for Plastic Extruder Machine Conical Twin Screw and Barrel material ... PP,PE,PVC,PET,ABS,PPR for Plastic Extruder Machine Conical Twin Screw and Barrel Zhejiang Bohai ... ridge,and uses different alloy and welding methods for the screw of different functions.Materials38CrMoAlA (JIS ... wear & abrasion alloy (bimetallic)3)tungsten carbide;4)cobalt base alloy5)stainless steel 6)Gh113 nickel ...