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Conical twin screw and barrel

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1)38CrMoAlA(JIS SACM645)
2)9Cr18MoV

1) 38CrMoAlA(JIS SACM645)
2) 9Cr18Mo

Heat-treatment
Nitriding treatment
Spray bimetallic coating

Quideline of technique
Depth of nitration layer: 0.05~0.08mm
Hardness of nitration: 900~1000hv
Fragility of nitration: less than grand one
Roughness of the surface: Ra0.4
Linearity of the screw: 0.015mm/m
The surface hardness of chrom plating after nitrogention:more than 950hv
Chrome-plating layer thickness:0.025~0.085mm

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