Ferritic nitro-carburizing introduces both nitrogen and carbon into the steel surface at a temperature below the lower critical point, so the steel remains in the ferritic condition during treatment. The process forms a compound layer and diffusion zone that can improve wear resistance, scuff resistance, and fatigue behavior.
Because there is no full austenitize-and-quench cycle, distortion is generally lower than with conventional hardening methods.
FNC is often selected for finished components where dimensional control is critical and only a relatively shallow hard surface is required.
At Braddock, ferritic nitro-carburizing would be used where the engineering target is surface performance with minimal movement of the base part.
FNC is widely used for finished ferrous parts requiring shallow case performance and good dimensional control.
FNC is typically performed at temperatures between approximately 950°F and 1100°F using gas, salt, or plasma-based methods. Nitrogen and carbon diffuse into the ferritic matrix and produce a thin compound layer near the surface, plus a deeper diffusion zone below it.
Performance depends on compound layer thickness, diffusion depth, base material, and any post-oxidation treatment.
The process can improve wear resistance and seizure resistance, but overly thick or brittle compound layers may be undesirable in some applications.
Braddock would control temperature, time, process chemistry, and any post-oxidation step because these variables determine white-layer thickness, diffusion depth, and final surface performance.
