... 38CrMoAlA,nitrided 3.different designs Material of pvc screw barrel for plastic extruder Alloy-Steel of High-quality1)38CrMoAlA(JIS SACM645) ... m8. Screw straightness: 0.015mm9. Max.length:≤10000mmMaterial of barrel inside layertungsten alloy. Surface spraying, prolong life of screw ... type,double screen type, shunt type,separation type,exhaust type, pin type, mixed type, double-head type,three-head type, ...