An evolution in high-chromium steels

Through the evochrome process, H-O-T is now able to nitride rust and acid-resistant steels with a high content of chromium and alloy in gas. The nitriding depth is considerably higher than with plasma nitriding, but with comparable process times, and even drill holes and recesses are nitrided. Corrosion resistance – which is greatly reduced by plasma nitriding – is largely retained with the new evochrome process.

Areas of application

Mechanical engineering | Mold making
Medical technology | Electrical engineering

Material groups

Rust and acid-resistant steels
e.g. 1.4542, 1.4462, 1.4305, 1.4301, …


  • Excellent corrosion resistance
  • Extreme nitriding depth
  • Drill holes and recesses are nitrided

Notes on production

  • Blasting is required after the process (charge payable)
  • Sharp edges must be mechanically rounded or must be covered
  • A production process-related increase in dimensions of approx. 20–30µm must be factored in