... treatment 3)Bimetallic welding PVC Injection molding machine single screw barrel We ,Lucheng screw Machinery Factory, is one of ... alloy steelTechnology: nitrided treatment, alloy coating spraying, heat-treatmentAppliance: PVC, PP, PE, PA, PC, ABS .etcDepth of Nitrated ... finishHigh-frequency quenchingSpray coating Bimetallic-alloyVacuum quenching PVC Injection molding machinery single screw barrel