... 4.ISO9001-2008 Carbide alloy screw barrel for plastic screw extruder Techincal Advantages of Bimetallic Nitrided treatment Paralllel ... etc. Meanwhile,Used for PVC + 30% CaCo3, recylced plastic material,etc Carbide alloy screw barrel for plastic screw extruder DiameterΦ15mm-Φ ... output requirement.Materials38CrMoAlA (JIS SACM645)SKD61 ApplicationPVC plate, pipe, profile, pellet and mould, at the same time ...