Extruder screw barrel Diameter: φ15-φ500 L/D ratio:15-55 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 Product classification: According to different ingredents and products the screw can be chosen: general type, pin type, barrier type, separation type, and gas-exhausting/vented type, etc.
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