Material of screw and barrel：38CrMoALA Nitrogen treatment, hard plating, high frequency quenching. so the surface of the screw barrel has higher hardness and wear resistance, improving the anti-corrosion ability.

1、Material of screw and barrel：38CrMoALA   nitriding treatment，surface hardness：HV≥900  depth of nitration case：0.5-0.8mm   

2、Material of alloy screw：material38CrMoALA,so that the double-alloy spray welding on the surface of the screw edge effectively improves the life of the screw   

3、Material of screw and barrel：material38CrMoALA. The easy-to-wear part of the feed port adopts imported alloy steel. After special treatment, it can effectively improve the wear resistance of the barrel and increase the service life.

The bimetal screw is also sprayed from the top of the crown, and the equipment is replaced with a high-pressure fast full-alloy coating. The corrosion-resistant high-temperature alloy is suitable for nylon glass fiber, magnetic powder, aluminum-magnesium powder, bakelite injection, etc. WPT3 There are two characteristics of WPT1, WPT2, wear resistance, corrosion resistance and high temperature.