Ferritic Nitrocarburizing (FNC)


Ferritic Nitrocarburizing (FNC) Overview


Ferritic Nitrocarburizing (FNC) is a thermochemical treatment process that enhances steel components’ surface hardness, wear resistance, and fatigue strength.

It involves diffusing nitrogen and carbon into the surface of the steel at temperatures typically in the range of 950°F to 1,150°F (510°C to 620°C).

This range is below the critical transformation temperature, ensuring no phase change in the steel and resulting in a hard, wear-resistant ferritic nitrocarburized case.


Increased Wear Resistance

The FNC process produces a hard case on the component’s surface, significantly improving its wear resistance.

Enhanced Fatigue Strength

FNC increases the fatigue strength of steel components, making them less prone to failure under cyclic loads.

Corrosion Resistance

The process improves the corrosion resistance of steel, as the nitrocarburized layer acts as a barrier to environmental attacks.

Minimal Distortion

Since FNC takes place at temperatures below the phase transformation range, the distortion of components is minimal.


Compared to other surface hardening methods, FNC is cost-effective and provides excellent value for its improvements.

Materials and Applications Suitable for Ferritic Nitrocarburizing (FNC)

Various materials such as low-alloy steels, carbon steels, and cast irons can benefit from the Ferritic Nitrocarburizing process:


FNC is most effective on low-alloy steels, carbon steels, and cast irons. Certain stainless steels can also be nitrocarburized by pre-treating them to make them more receptive to nitrogen diffusion.


The FNC process is highly valued in various industries. Key applications include:
  • Automotive components such as camshafts, gears, and piston rings
  • Firearms components for improved wear and corrosion resistance
  • Tool and die for enhanced durability
  • Machine parts requiring improved wear resistance and fatigue strength

Request a Quote from Metals Technology Today

At Metals Technology, we pride ourselves on delivering high-quality Ferritic Nitrocarburizing (FNC) services.

Whether you want to improve wear resistance, fatigue strength, or corrosion resistance, FNC is an outstanding option.

Our expert team is dedicated to providing the best solutions tailored to your specific requirements. Don’t hesitate to elevate the performance of your components – Request a quote from Metals Technology today.