Lindberg Cyclone Electric Retort Pit Nitriding Furnace

Cyclone Electric Retort Pit Furnace
Electric-powered pit furnaces with built-in retort available in single or two-stage nitriding systems. Cyclone electric-powered pit furnaces are capable of temperatures up to 1250° (1400°F optional). The top loading furnaces furnaces have a separate heating/fan chamber that provides heat to the work chamber. The workload is heated by a unique re-circulating convection heating system that forces pressurized air through the work chamber at a high velocity. A "suspended" fan shroud mates with either the basket or baffle to provide a closed path of circulation when the cover is closed. Atmosphere leaves the fan and travels downward through annular clearance between the retort and basket or shroud to below the load support, then upward through the work before again entering the fan inlet. 


  • Exceptionally high surface hardness
  • Parts with high resistance to metal-to-metal wear
  • Lower finishing costs—minimizes warpage, distortion, galling, and seizing
  • Improved corrosion resistance—especially if parts are not subjected to a final finishing operation after nitriding


  • Exceptional uniformity
  • Long service life
  • Fast, efficient cooling
  • Simplified installation
  • Nominal maintenance
  • Fully automatic process control


  • Ammonia dissociators
  • Removable retort for accelerated cooling
  • Automated and programmable systems


  • Nitriding