Heat treatments

The heat and thermo-chemical treatments for steels

Thanks to the more than thirty years of experience in the aeronautics world, UMBRA is able to provide a professional service as a supplier for a wide range of heat and thermo-chemical treatments for steels. Since 2006 the NADCAP qualification (achieving MERIT status in 2011) provides further proof of the high technical-quality standard. All our heat treatment systems are certified for pyrometry according to international standard AMS 2750; some of them are also certified for customer specification BAC 5621.

The certification treatments offered by UMBRA

Thanks to many years of experience, UMBRA has drawn up internal specifications for the heat treatment able to satisfy the panorama of requests in the aeronautical and industrial field. The company are therefore in a position to carry out certified thermo treatments for:


  • AMS 2759 - Heat Treatment of Steel Parts - General Requirements
  • AMS H 6875 - Heat Treatment of Steel Raw Materials
  • AMS 2759/1 - Heat Treatment of carbon and Low-Alloy Steel Parts Minimum Tensile Strength Below 220 ksi (1517 MPa)
  • AMS 2759/2 - Heat Treatment of Low-Alloy Steel Parts, Minimum Tensile Strength 220 ksi (1517 MPa) and Higher
  • AMS 2759/3 - Heat Treatment Precipitation-Hardening Corrosion-Resistant and Maraging Steel Parts
  • AMS 2759/5 - Heat Treatment of Martensitic Corrosion-Resistant Steel Parts
  • AMS 2759/6 - Gas Nitriding and Heat Treatment of Low-Alloy Steel Parts
  • AMS 2759/7 - Carburizing and Heat Treatment of Carburizing Grade Steel Parts
  • AMS 2759/9 - Hydrogen Embrittlement Relief (Baking) of Steel Parts


  • BAC 5617 - Heat Treat of Alloy Steels
  • BAC 5619 - Heat Treat of Corrosion Resistant Steel
  • BAC 5641 -  Carburizing of Steel
  • BAC 5640 - Nitriding of Steel
  • BAC 5620 - Induction Hardening


  • Low pressure carburizing
  • Hardening and tempering of steel
  • Precipitation hardening
  • Gas Nitriding
  • Induction hardening
  • Gas carburizing
  • Low pressure hardening
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