Protective gas hardening


Protective gas hardening (tempering) increases the strength and toughness of the treated components. The process is suitable for use with all hardenable steels and tempering steels with a high alloy content. Tempering is often used prior to thermochemical heat treatment, especially nitriding.

Protective gas hardening combines the heat treatment processes of hardening and tempering in a high temperature range. In the first step of the process, hardening, the components are heated to austenizing temperature in order to transform the structure into martensite and then quenched. The subsequent tempering process achieves the optimal required mechanical properties, especially the desired hardness and toughness.


  • High strength and hardness
  • High tensile and notch toughness
  • Increased bend fatigue strength
  • High fatigue endurance