... Used 3. Wear-resistant Nitriding parallel twin screw barrel forplastic extruder machine/twin parallel screw barrel Lucheng Factory/Parallel twin screw barrelDiameter25,50,65,80,90,105 ... alloy and welding methods for the screw of different functions.Materials38CrMoAlA (JIS SACM645)SKD61 .etcApplication PS,HIPS,ABS,SAN,EPN/LDPE,HDPE ...