Corrtherm Element Electric Box Furnace

The rugged Lindberg/MPH Corrtherm element electric box furnace offers a unique combination of high performance and low maintenance. Thick cross section, low-voltage Corrtherm heating elements completely eliminate the need for a retort, even in high-carbon atmospheres. Because heat is radiated directly to the work, the chamber can have large dimensions without sacrificing temperature uniformity. This allows processing of very large parts with better accuracy than retort-style furnaces. This design has exceptional life, requiring minimal maintenance and avoiding the cracking problems inherent with retorts. These furnaces operate at temperatures up to 1850°F.


Corrtherm Element Electric Box Furnace
  • Requires low maintenance
  • Large dimensions to process large parts without sacrificing temperature uniformity
  • Durable design for years of worry-free use


  • Thick cross-section, low-voltage Corrtherm heating elements
  • Standard roof-mounted circulating fan
  • Standard endothermic atmosphere system


  • Carburizing
  • Carbonitriding
  • Annealing
  • Normalizing
  • Tool steel hardening


  • Temperature range to 1850°F


  • Carbon control with oxygen probe
  • Gas flow meters for dissociated ammonia, exothermic, endothermic, or nitrogen atmosphere
  • Nitrogen-methanol atmosphere system
  • Control and recorder options
  • Roller rail hearth