... widely used in extruders,injection molding machine,rubber processing machine,other plastic rubber machine conical¶llel twin screw barrel for ... ,extruder screw barrel,screw barrel for injection molding machine,conical or parallel screw barrel,Material:38CrMoAlA,SKD11, ... nitriding treatment,alloy coating sparying,heat-treatment,etcAppliance:PE,PVC,PP,etc Technical index:Depth of Nitrated Layer: ...