1 Subject Content and Application Scope
This standard specifies the determination method for nitriding and nitrocarburizing depth of aircraft steel parts.
It is applicable to the determination of nitriding and nitrocarburizing depth of steel parts in aviation products, and may be taken as reference by other products.
2 Normative References
GB 9451 Determination of Total or Effective Thickness of Thin Surface Hardened Layers of Steel Parts
3 Terminology
Depth of nitriding layer: it includes compound layer (white-bright layer) and diffusion layer; the depth refers to the vertical distance measured from the workpiece surface to the clear boundary from the matrix structure or the position of specified boundary hardness value, expressed by the Latin alphabet DN.
