Technical index Depth of nitrated layer: 0.5-0.8mm Hardness of nitration: 900-1020hv Fragility of nitration: less than grade 1 Surface roughness: ra 0.4um Hardness of cr-coating layer: >=950hv Hardness of bimetallic layer: hrc55-72 Thickness of cr-coated layer: 0.03-0.08mm Depth of bimetallic layer: >2mm. 1set/wooden box.
