The N-EXT series is a solution package designed specifically for nitriding/nitrocarburizing aluminum extrusion dies. Its holistic design ties in all components together 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 also ensuring compliance with AMS 2759/10 and AMS 2759/12 specifications.


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


To discuss your nitriding and nitrocarburizing furnace requirements, fill out our request a quote form

Model Diameter Height Load Capacity
NXK-409 15¾”(400mm) 35½”(900mm) 660 lbs (300 kg)
NXK-412 15¾”(400mm) 47¼”(1200mm) 880 lbs (400 kg)
NXK-609 23½”(600mm) 35½”(900mm) 1300 lbs (600 kg
NXK-612 23½”(600mm) 47¼”(1200mm) 1700 lbs (800 kg)
NXK-812 31½”(800mm) 47¼”(1200mm) 2200 lbs (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 inter-action with nitriding atmosphere.
  • Uniform temperature distribution obtained through independently controlled heating zones and intensive atmosphere circulation ensuring full control of nitriding potential in all stages of the process.
  • Light ceramic fiber insulation, reducing heat losses and thus energy consumption.
  • Kanthal long lasting heating elements.
  • Preconfigured & factory-tested
  • Fully calibrated
  • Pre-tested for metallurgical results
  • Plug & 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 specifications AMS 2759/10 and AMS 2759/12
  • 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 consistency of results. The entire nitriding /nitrocarburizing process is executed in an automatic, self-adjusting, and operator independent manner.


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 flow for a cycle
  • 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 & 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, and cool) are automatically carried out sequentially in one uninterrupted cycle, without further operator intervention. This set-up provides a high degree of accuracy in process execution, contributing to consistency in nitriding / nitrocarburizing results.



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


Assures a clean, environmentally friendly process
Economical and safe
supply of dissociated
Recirculates clean cooling
water to prolong the longevity of furnace elements.
Easy-to-assemble Inconel
baskets and trays constructed for safe and easy loading