... PE,PVC,PET,ABS,PPR for Plastic Extruder Machine Conical Twin Screw and Barrel material: bimetallic layer PP,PE,PVC,PET,ABS,PPR for Plastic Extruder Machine ... ridge,and uses different alloy and welding methods for the screw of different functions.Materials38CrMoAlA (JIS ... nickel based alloy Nitride Hardness950-1050HVPackingWrapped up by film in woodenNitride Brittleness≤Grade OnePayment TermT/T , ...