Case hardening under protective gas is a type of thermochemical heat treatment. It gives the surface layer of components a high hardness and also increases the strength of the core structure.
The surface layer of the component is enriched with carbon by means of carbon-containing gases. As the distance from the surface increases the carbon concentration decreases, so that a strong core remains. After carbonisation the components are hardened and tempered in order to attain the desired properties.
- High surface hardness, strong core
- Increased bend fatigue strength
- High resistance to abrasive wear, rolling wear and impact wear