The multipurpose NXK series of nitriding/nitrocarburizing systems is a cost-conscious and dependable choice for use in small-scale processing as well as general laboratory/testing purposes. Its holistic design ties all components together with the latest technological advances into a single, compact platform that ensures compliance with AMS 2759/10 and AMS 2759/12 standards.

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

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

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


660 lb. (300 kg)
NXK-412 15¾”(400mm) 47¼”(1200mm) 880 lb. (400 kg)
NXK-609 23½”(600mm) 35½”(900mm) 1300 lb. (600 kg)
NXK-612 23½”(600mm) 47¼”(1200mm) 1700 lb. (800 kg)
NXK-812 31½”(800mm) 47¼”(1200mm) 2200 lb. (1000 kg)
NXK-815 31½”(800mm) 59”(1500mm) 3300 lb. (1500 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
  • Easily moved into the heat treat facility with the help of a forklift
  • Pretested for metallurgical results
  • 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 consistent nitriding/nitrocarburizing results.