1.Material: 38CrMoAl A Nitriding treatment, Surface hardness: HVmore than 900;Nitriding depth: 0.5-0.8mm
2.Base material: 38CrMoAI A, Special alloy is welded on the flight of screw , prolong life of screw.
3.Easy wearing parts of barrel made from anti-wear alloy can be improved abrasion performance.