PP,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 ... 6)Gh113 nickel based alloy Nitride Hardness950-1050HVPackingWrapped up by film in woodenNitride Brittleness≤Grade OnePayment TermT/T , L/C ... period:2-4years(Depends on the plastic raw materials)Bimetallic: much longer lifetime.Nitriding timeOver 180 hours