Bimetallic Conical Twin Screw Barrel 

Technical Specification Hardness After Hardening & Tempering: HB280-320 Nitrided Hardness: HV900-1050 Nitrided Case Depth: 0.50-0.80mm Nitrided Brittleness: Less than Grade 2 Surface Roughness: RA 0.4 Screw Straightness: 0.015mm Surface Chromium-Plating's Hardness After Nitriding: ≥ 900HV Chromium-Plating Depth: 0.025-0.10mm Alloy Hardness: HRC55-65 Alloy Depth: 0.8-2.0mm