screw barrel for rubber machine

Specifications: Product name: Screws and barrels for Rubber Processing Machine Screw Diameter: Φ30mm-Φ300mm Material: 38Cr Mo AlA;SKD61; SKD11;40Cr;42Cr Mo;high quality alloy steel Technology:nitriding treatment, alloy coating spraying, heat-treatment Technical Index: Depth of Nitrated Layer: 0.5-0.8mm Hardness of nitration: 900-1020Hv Fragility of nitration: Less than grade 1 Surface Hardness of Nitrated Cr coating layer: ≥950Hv Hardness of Bimetallic Layer: HRC55°-72° Thickness of Cr-coating Layer: 0.03-0.08mm Depth of Bimetallic Layer: >2mm