Gas Nitriding

Gas nitriding is a form of steel heat treatment in which one uses heat to diffuse nitrogen-rich gas onto the surface of the metal with the intention of hardening it. The nitride hardening process integrates into the bulk material, allowing the portion of metal below the surface layer to remain soft.
Ammonia is the most commonly used gas and it separates into nitrogen and hydrogen when it comes into contact with the metal. Only the nitrogen diffuses onto the surface to form the nitride layer. Quenching methods (such as oil quenching) is not required, and the metal’s core properties are not affected.

• Low-cost compared with other case applications. The process runs with minimum required supervision, post-process components are dimensionally stable, and there is very little if any treatment necessary in post heat treat operations.
• Zero to minimal distortion experienced on parts, which enables precise dimensional control.
• High volume capability. Furnace size is the primary limiting factor.
• Wear and corrosion resistant.