Film Blowing Machine Screw Barrel

Technology Index:

Material     38CrMoAIA      

Surface Roughness       Ra0.4

Diameter    20-300      

Screw Straightness       0.015mm

L/D Ratio   L/D=1060 

Cr-Plated Surface Hardness afterNitriding HV900HV

Tempering Hardness    HB240°280°      

Cr-Plating Layer Depth         0.050.10mm

Nitriding Layer Hardness      HV850°1000°Bimetallic Layer Depth     0.82.0mm

Nitriding Laer Depth    0.40.8mm  

Bimetallic Layer Hardness    HRC56°65°

nickel-based alloys

Nitriding Fragility        Grade Two