... long uselife 4.ISO9001-2008 Carbide alloy screw barrel for plastic screw extruder Techincal Advantages of Bimetallic Nitrided treatment ... etc. Meanwhile,Used for PVC + 30% CaCo3, recylced plastic material,etc Carbide alloy screw barrel for plastic screw extruder DiameterΦ15mm ... time,it solved the technical problem of low foaming, high foaming,high filling, wear and corrosion.Nitride Case Depth0 ...