Conical twin screw and barrel Specification: 45/90, 45/100, 50/105, 51/105, 55/110, 55/120, 58/124, 60/125, 65/120, 65/132, 68/143, 70/135, 70/140, 75/150, 80/143, 80/156, 92/188 Above are our standard specification, we also can customize for you Screw structure and compression ratio can be designed according to different products and raw material. Base Materials: 1)38CrMoAlA(JIS SACM 645) 2)42CrMo(AISI 4140) 3)Cr12MoV(JIS SKD-11) 4)4Cr5MoSiV1(JIS SKD-61) 5)9Cr18MoV DC53 (JIS G4404) Bimetallic Alloy Materials: 1)Fe-based alloy 2)Ni-based alloy 3)Co-based alloy 4)NiCo-based alloy 5)Wolfram carbide Bimetallic alloy level: Alloy powder including 40% Wolfram Carbon Alloy powder including 25% Wolfram Carbon Alloy powder including 9.5% Wolfram Carbon Processing Technology: Heat treatment High-frequency quenching Nitriding treatment Hard-chrome electroplating Bimetallic alloy welding Technical Parameter: Nitrided layer depth:0.50-0.80mm Nitrided hardness: 950-1100HV Nitrided brittleness: Less than 2 level Surface roughness: Ra 0.4μm Linearity of screw: 0.015mm/m Hard-chrome plating hardness after nitriding: ≥950HV Chrome-plating layer depth: 0.025~0.10mm Bimetallic layer depth: 3-5 mm Twin screw and barrel made: CINCINNATI, BATTENFELD, KRUSSMAFFEI, BAUSANO, AMUT model spares. We can manufacture all types of screws and barrels according to clients’ requirement.