Hard Alloy Screw CPP Extruder Screw Cylinder Screw Super high wear-resistant/high impact-resistant application Hard Alloy Screw CPP Extruder Screw Cylinder Screw Super-hard processing of professional, special, non-standard, special shaped ... be hit or chipping will happen. HRF10: ultra micro-grain quality carbide, has excellent wear resistance, but its impact resistance is ...