screw barrel assembly parts injection screw tips Grade: Bimetallic grade screw tips Composition: 10-15% tungsten carbide with bimetalic alloy sparyingg Material: 38CrMoAlA, SKD11,SKD61 etc. Treatment: Nitriding 96 hours Depth of Nitrated Layer: 0.5-0.8mm Hardness of nitration: 58-72HRC Fragility of nitration: Less than grade 1 Surface roughness: Ra 0.4um Our screw and barrel can ensure high performance and low energy consumption of extruder and Injection molding machine. What's more, we can supply professional screw and barrel to your order