The multipurpose NXK series of nitriding / nitrocarburizing systems is a cost-conscious and dependable choice for use in small-scale processing as well as for general laboratory/testing purposes. Its holistic design ties in all components together with the latest technology advances into a single, compact platform that ensures 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 [link].

Model Diameter Height Load Capacity
NXK-409 15¾”(400mm)


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 and factory-tested
  • Fully calibrated
  • Easily moved into the heat treat facility with the help of a forklift
  • Pre-tested for metallurgical results
  • 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)
  • Nitreg®-S Potential-Controlled Gas Nitriding with In-Process Activation for Stainless Steels (LINK)
  • Nano-S™ Potential-Controlled Gas Nitriding for Stainless Steels (with better corrosion resistance) (LINK)
  • ONC® In-Process Post-Nitriding or Post-Nitrocarburizing Oxidation

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