... 3.Wear-resistant 4.Bimetallic & Nitrided abs,pvc,pp,pe,pa conical twin screw and barrel We ,Lucheng screw Machinery Factory ... : nitrided treatment, alloy coating spraying, heat-treatmentAppliance: PVC, PP, PE, PA, PC, ABS .etcDepth of Nitrated Layer: 0.5-0.7mmHardness ... of Nitrated Cr coating layer: ≥950HvHardness of Bimetallic Layer: HRC55°-72°Thickness of Cr-coating Layer: 0.03-0.08mmDepth of ...