Sand CastingChina Nitrided Barrel with Feedscrew Used on Single-Screw-Extruder Made of 4140 or 5140 or SKD61 or 1.8550, Find details about China Single Screw Barrel, Hardfacing Screw Barrel for Extruder Machines from Nitrided Barrel with Feedscrew Used on Single-Screw-Extruder Made of 4140 or 5140 or SKD61 or 1.8550