1.Material: 38CrMoAIA
Nitriding treatment,Surface hardness: HV≥900
Nitriding depth: 0.5~0.8mm

2.Base material: 38CrMoAIA,Special alloy is welded on the flight of screw,prolong life of screw.

3.Easy wearing parts of barrel made form anti-wear ally can be improved abrasion performance.