Bimetallic Single Screw Barrel For Injection Molding Machine Tungsten Carbide Screw Barrel Molybdenum Alloy Screw Barrel Bimetallic Single Screw Barrel ... .8~2.0mm Alloy hardness HRC56°~65° Alloy iron,nickel,tungsten,molybdenum Types of screw Gradual type,mutant type,wave type ...