Conical twin screw barrel 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 The above are standard specifications, we can customize according to customers’ requirements. The compression ratio of screws can be designed according to different products and mixtures. Technical Parameter: Hardness After Hardening & Tempering:HB280-320 Nitrided hardness: HV850-1000 Nitrided layer depth:0.50-0.80mm Nitrided brittleness: ≤ Grade Ⅱ Surface roughness: Ra 0.4μm Linearity of screw: 0.015mm Bimetallic layer depth: ≥2mm Bimetallic hardness: HRC60-72 Hard-chrome plating hardness after nitriding: ≥900HV Chrome-plating layer depth: 0.025-0.10mm |