Conical barrel screw can be used as pinch plate, profile, pipe, granulation and so on.

Comressing rate of screw and barrel can be designed according to different raw materials and products.

Technical Indexes：
Material selectiong with high-quality 38CrMOALA   SACM645  SCM440

Tempering Hardness  ：HB240°～280°

Nitriding Hardness：HV850°～1000°

Nitriding Depth：0.45～0.7mm

Nitriding Brittleness：≤Garde 2

Surface  Roughness：Ra0.4

Screw Straightness：0.015mm

Hardness of surface chromium coating after nitriding：≥900HV

Thickness of chromium coating：0.05～0.10mm

Depth of dual alloy：HRC56°～65°（select nickel-base alloy）

Alloy Depth：0.8～2.0mm