Batch Retort Furnace for Nitriding and FNC

Batch Retort Furnace for Nitriding and Ferritic Nitrocarburizing (FNC)

Ferritic Nitrocarburizing (FNC) has acquired increasing significance especially when the process is combined with steam oxidation. The result of this heat treatment is a wear resistant oxidation layer which is similar to hard chrome plating with comparably good corrosion resistance. A desirable secondary effect is the black or anthracite colored part surface. This treatment requires furnaces with a gastight retort. The heating can take place electrically or with industrial gas burners. The batch retort furnace, especially designed for that purpose, offers all the conditions for an economic heat treatment with reproducible results:

  • high temperature uniformity
  • strong gas circulation
  • minimized use of process gas
  • programmable heat treatment process
  • controlled oxidation layer by means of lambda probe
  • extremely high cooling rate through rapid indirect cooling system

This furnace has all the advantages of vertical retort furnaces, but needs neither pits nor hoists. It can be charged more easily and can be integrated into existing AICHELIN chamber furnace lines.

For continous Nitriding and Ferritic Nitrocarburizing (FNC) of mass parts such as Brake Rotors, please see our Roller Hearth Furnace or Pusher Furnace plants. For the best nitriding results we recommend our Flexiclean washing machine to clean the parts before the nitriding process.

Examples of applications:


  • Pressing tools
  • Molds, matrices
  • Extruders / extruder shafts
  • Hydraulic pistons
  • Drive parts
  • Gears
  • Springs


  • Crankshafts
  • Camshafts
  • Piston rods
  • Brake pistons
  • Stamped and forged parts
  • Shafts and bolts for cable cars
  • Ball joints, ball journals
  • Brake rotors