Screw and Charging Barrel for Extrusion Machinery 

Base Materials: 1.38CrMoAIA(JIS SACM645) 2.42 CrMo (AISI 4140) 3.4Cr5MoSiV1(JIS SKD-61) 4.9Cr18MOV 5. HPT Bimetallic alloy materials: 1. Fe-based alloy 2. Ni-based alloy/Deloro alloy 3. Co-based alloy 4. NiCo-based alloy 5. Tungsten carbide/Wolfram carbide Technics: Heat treatment High-frequency quenching Nitriding treatment Hard-chrome electroplating Bimetallic alloy welding Bimetallic alloy centrifugal casting Technical parameter: Nitrided layer depth: 0.5-0.8mm Nitrided hardness: 900-1000HV Nitrided brittleness: Less than grade 1 Surface roughness: Ra0.4 Linearity of screw: 0.015mm Hard-chrome plating hardness after nitriding: >950HV Chrome-plating layer depth: 0.025-0.085mm Bimetallic layer depth: 3mm