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Heat treatment furnace facilities for the steel industry

Roller-hearth furnaces for long products

This type of furnace was specially developed for soft annealing to achieve globular cementite in medium and high-alloyed tool steels, high speed steels, cold heading and bearing steels.

As well as taking care of the as-annealed quality factors, this design of furnace also minimizes process atmosphere consumption (nitrogen only) to improve economy. A CO2 control system automatically calculates and regulates the required process atmosphere (nitrogen).

Processing temperature range of 400 °C to 950 °C (1050 °C). Net throughputs of between 2,000 kg/h and 10,000 kg/h can be achieved depending on the size of the facility and the heat treatment program selected.

These furnaces are built with a standardized hearth width (charge width) of 1750 mm or 2250 mm. Other widths are available on request.

For certain steel grades requiring an extremely high cooling gradient (up to 300 K/min), the roller-hearth furnace can be fitted with a HICON® jet cooler.

The facility can be implemented to comply with the standards required by the automotive industry in accordance with CQI-9 (AIAG).

Advantages of the EBNER design

  • optimum spheroidization of the microstructure up to 100 % and/or formation of a perlite/ferrite microstructure
  • precise zone control with very tight temperature tolerances
  • decarb-free thanks to process atmosphere know-how
  • long service life and low maintenance requirement on components subjected to high thermal or mechanical stress (radiant tubes, hearth rollers, bearings, etc.)
  • low unit consumption data due to good insulation, high combustion efficiency, compact furnace design and vacuum locks
  • low pollutant emissions due to two-stage combustion
  • straightforward operation due to automated process control
  • no process atmosphere recirculation fans needed in workload space

Roller-hearth furnaces

Seamless tube
Vacuum lock with annealing furnace
Bright annealing tubes
Charging roller table

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