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The N-EXT series is a solution package designed specifically for nitriding/nitrocarburizing aluminum extrusion dies. Its holistic design ties in all components with the latest technology advances into a self-contained, skid-mounted platform. The system comes complete with Phase-Controlled NITREG® technology to deliver superior quality and reliability year after year while optimizing the performance of aluminum extrusion dies and the cost efficiency of extrusion operations and ensuring compliance with AMS 2759/10 and AMS 2759/12 standards.

  • Minimal space requirements
  • Short startup period
  • Low operating costs for processing low quantities

To discuss your nitriding and nitrocarburizing furnace requirements, please fill out our “Request a Quote” form.

Model Diameter Height Load Capacity
N-EXT-409 15¾”(400mm) 35½”(900mm) 660 lb. (300 kg)
N-EXT-412 15¾”(400mm) 47¼”(1200mm) 880 lb. (400 kg)
N-EXT-609 23½”(600mm) 35½”(900mm) 1300 lb. (600 kg)
N-EXT-612 23½”(600mm) 47¼”(1200mm) 1700 lb. (800 kg)
N-EXT-812 31½”(800mm) 47¼”(1200mm) 2200 lb. (1000 kg)

NOTE: Nitrex reserves the right to make changes without notice.
For non-standard sizes, please contact Nitrex.

  • Inconel 600 (refractory steel) retort and racking for long service life and non-reactive interaction with nitriding atmosphere
  • Uniform temperature distribution obtained through independently controlled heating zones and intensive atmosphere circulation ensuring full control of nitriding potential throughout all stages of the process
  • Light ceramic fiber insulation reduces heat loss and thus energy consumption
  • Kanthal long-lasting heating elements
  • Preconfigured and factory-tested
  • Fully calibrated
  • Pretested for metallurgical results
  • Plug and Play
  • Easily moved into the heat treat facility with the help of a forklift
  • Fully automated operation guarantees repeatable and consistent results
  • True Nitriding/Nitrocarburizing Process Control – Compliant with AMS 2759/10 and AMS 2759/12 standards
  • Superior case properties per customer specifications
  • Various case configurations possible
  • Repetition of results
  • System for data archiving and reporting as well as remote diagnostics
  • SCADA connectivity
  • Clean, environmentally-friendly processes powered by Nitrex effluent neutralizers


The Nitrex process control system is a product of extensive R&D in process automation and enables accurate process execution and consistent results. The entire nitriding/nitrocarburizing process is automatic, self-adjusting and operator-independent.


This expert system monitors and responds to changes in nitriding conditions by regulating the following parameters and operating functions:

  • Furnace heating functions such as process temperature, and overheat control with automatic emergency procedures
  • Atmosphere composition and cycle flow
  • Nitriding atmosphere ratios
  • Nitriding Potential KN (dissociation rate, for customer defined cycles)
  • Temperature for each process stage
  • Gas pressure inside the retort
  • Gas recirculation
  • Execution of the cooling stage and shutdown
  • Cooling water
  • Process safety features



With our “set and forget” process, the user selects the desired recipe from a library of researched and tested recipes and initiates a process. From there, all stages of the nitriding cycle (e.g., purge, heat, process control, cool) are automatically sequenced in one uninterrupted cycle, without further operator intervention. This setup provides a high degree of accuracy in process execution, contributing to consistency in nitriding/nitrocarburizing results.



  • Nitreg® Potential-Controlled Gas Nitriding
  • Nitreg®-C Potential-Controlled Gas Nitrocarburizing
  • Phase-Controlled Gas Nitriding and Nitrocarburizing