... 3.Wear-resistant 4.Bimetallic & Nitrided abs,pvc,pp,pe,pa conical twin screw and barrel We ,Lucheng screw Machinery ... design and enhancing service. Our products:Screws Barrels for Injection, Extrusion, and Blow Molding applications; relevant accessories(such as die head ... : nitrided treatment, alloy coating spraying, heat-treatmentAppliance: PVC, PP, PE, PA, PC, ABS .etcDepth of Nitrated Layer: 0.5-0 ...