... 2electroplated hard Cr 3spraying wear-resis Specifications of this conical twin-screw and barrel: Φ45/90 Φ45/100 Φ50/105 ... Chromium layer thickness:0.01-0.10mm, twin-alloy hardness:HRC60~70, twin-alloy depth:>2mm, Screw edges are made by ... twin-alloy which could improve screw's using life.The ... requirement,please contact us when you want! Conical twin-screw &barrel