Material
Alloy steel of High-quality
1) 38 CrMoA LA (JIS SACM645)
2) 9 Cr18MOV

Heat-treatment
Nitriding treatment
Spray coating Bimetallic-alloy

Technical data
Depth of nitration layer: 0.50 -0.80mm
Hardness of nitration: 900-1000HV
Fragility of nitration: Less than grade 1
Roughness of the surface: Ra0.4
Linearity of the screw: 0.015mm
The surface hard chromium plating hardness after
Nitrogenation: ≥ 950Hv
Chrome-plating layer thickness: 0.025 -0.085mm.