... extruding,extruder twin-screw and barrel 1nitriding treatment 2electroplated hard Cr 3spraying wear-resist Specifications of this conical twin-screw ... layer thickness:0.01-0.10mm, twin-alloy hardness:HRC60~70, twin-alloy depth:>2mm, Screw edges are made by ... by alloy which could improve the abrasion effectively. Applicable scope:common plastic,PP, PE, ABS, PVC, pelleting,pipe,special-shaped,plate, ...