... plastic injection machines, 15-300mm single screw extruders, 30-130mm tapered and parallel double screw extruders, rubber machinery, petroleum ... grinding, and polishing. The company can make the screw cylinder made of GH113 Nickel-based alloy which can ... -frequency quenchingSpray coating Bimetallic-alloyVacuum quenching Standards of single screw and cylinder of extruder machine:φ20mm~φ300mm ratio ...