Material
High quality Alloy steel
1)38CrMoALA(JIS SACM645)
2)42CrMo(JIS SCM440)
3)SKD61
Technical Specification
Tempering hardness: 240~280HV
Nitrided Hardness: 900-1020HV
Depth of nitriding: 0.5mm-0.8mm
Nitriding brittleness:≦2 grade
Surface roughness:Ra 0.4um
Straightness of the screw/barrel:0.015mm
Screw type:
Aiming at different plastic property,the screw can be chosen from:
Ordinary,gradual,mutant,pinned,separating and exhausting types.
The compression ratio of screw can be designed according to different raw materials and requirements of clients.
Heat Treatment
Nitriding treatment
Chrome Plated
High speed Quenching
Quenching without air
Bimetallic welding for screw and Centrifugal casting for barrel