twin screw barrel/Conical screw barrel for pvc,upvc,pe. We supply various types of screw barrels according ... molding machine,twin screw barrel,screw barrel for extruder machine,screw barrel for injection molding machine.Material:38CrMoAlA,SKD11,SKD61,HPT2B, ... etcTechnology:nitriding treatment,alloy coating sparying,heat-treatment,etcAppliance:PE,PVC,PP,etc Technical index:Depth of Nitrated Layer: 0.5 ...