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          Conical Twin Screw Barrel


          Technical Information for twin screw barrel for pipe extrusion
          Main Base Materials 1.38CrMoAlA (SACM645) Main Alloy Materials 1. Ni-based alloy/Deloro alloy
            2. SKD-61 (Special Tool Steel)   2. Tungsten carbide/Wolfram carbide
            3. 42CrMo (Ultrahigh StrengthSteel)   3. NiCo-based alloy
            4. DC53 (Cold WorkDie Steel)   4. Fe-based alloy
            5. W6Mo5Cr4V2 (High-SpeedToolSteel)   5. Co-based alloy
          Processing Technics 1. Heat treatment Technical Parameters Nitriding layer depth:0.5-0.8mm
            2. Quenching   Nitrided hardness:900-1000HV
            3. Nitriding treatment   Bimetallic layer depth:3 mm
            4. Bimetallic alloy welding for screw   Bimetallic hardness:57~69HRC
            5. Bimetallic alloy centrifugal casting for barrel   Hard-chrome plating hardness after nitriding:≥950HV
            6. Hard-chrome electroplating   Chrome-plating layer depth:0.03-0.09mm
            Linearity of screw:0.015mm   Surface roughness:Ra 0.4

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