Heat & Surface Treatment

The processes that give our components their personal character

Heat & Surface Treatment

We can offer you a wide range of hardening processes – and we are competent, reliable and innovative.

  • Galvanic surfaces

    • Gold plating
    • Silver plating
    • Nickel plating
    • Tin plating
    • Zinc plating
    • Passivation
    • Copper plating
    • etc.
  • Phosphating

    • Corrosion protection
  • Zinc blade coating

    • Corrosion protection
    • Delta Tone
    • Delta Seal
    • etc.
  • Polishing

    • Perfect edge rounding
      (even on narrow part sections)
    • Optimally smoothed surface
  • Lubricant coating

    • Molykote
    • Glisscoat
    • etc.
  • Painted or powder coated surfaces

    • Corrosion protection
    • Color coding
  • Oiling and greasing

    • Corrosion protection
  • Ball and glass bead blasting

    • Surface hardening
    • Deburring
  • Vibratory finishing / grinding

    • Deburring
    • Polishing


  • Cleaning requirements

    • De-oiling and degreasing before heat treatment
    • De-oiling and degreasing before delivery
    • Removal of dirt and shavings
    • Fulfillment of restrictive cleanliness requirements for the automotive industry
    • Fulfillment of restrictive cleanliness requirements for the Medical industry
  • Cleaning media

    • Hydrocarbons
    • Modified alcohol
    • Aqueous media
  • Cleaning aids

    • Wash basket movement (raising, lowering, swiveling and rotating)
    • (Pressure) flooding or spraying of the medium
    • Ultrasound
  • Cleanliness inspection

    • Visual inspection (microscope)
    • Cleanliness requirements as per VDA Volume 19
    • Adherence to internal and customer-specific purity classes

Bainitic hardening

To increase the hardness of components, Eberle has modern, fully automated heat treatment systems at its disposal. We use the special hardening process of austempering, which hardens the stamped-bent parts, by heating and quenching them in a salt bath. In this heat treatment process,the stamped-bent parts, are heated to a temperature of 800 to 1,050 °C. They are then quenched in a salt bath at a temperature of 300 to 380 °C to produce the intermediate structure known as bainite, which achieves a high level of hardness combined with the best possible strength. At the same time, it also offers very favorable conditions for reducing quench distortion.


Inert gas tempering

Tempering under inert gas is a heat treatment process in which the stamped-bent parts, power springs and strip springs are heated in an oxygen-free inert gas atmosphere to a certain temperature, held at that temperature for some time and then cooled slowly. This improves the general mechanical properties of the material and reduces tensions. The surfaces of the stamped-bent parts, power springs and strip springs are protected from scaling or changes in color.


Tempering for power springs

Our heat treatment processes improve the technical properties of our power springs to the highest achievable level in terms of torque and component service life.