Vacuum Gas Nitriding Furnace Manufacturer

Therelek’s gas nitriding furnaces produce the most appropriate condition for all applications. The furnaces are specially designed for gas nitriding of tool steels which happen to be limited to applications like the hot work tool steels, and also tooling for the aluminium extrusion dies. 


The gas, during gas nitriding, is disposed of to a metal via heat in the furnace or sealed atmosphere and has easier disposal methods of the nitriding agent. Some of the key advantages that the vacuum gas nitriding furnaces by Therelek provide are as follows:

#Precise temperature control 

#Control over depth, hardness and dimensions

#Total coverage of nitriding including holes and bores

#Apt for the handling of large quantities of small pieces

#Works apt for alloy steels and low carbon steels


  • Fast gas cooling arrangements.
  • Exhaust gas neutralizers.
  • HMI with touchscreen operation.
  • Excellent process repeatability.
  • Very dense bulk load.
  • Low maintenance costs.
  • Gas exhaust cracking (optional Analyser NH3)
  • Excellent process repeatability.

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Features of Vacuum Gas Nitriding Furnace

Title Description
Furnace Type Cold Wall / Optional Hot Walled Retort (front loading)
Hot Zone Construction Cylindrical / Cubical
Temperature Range 700°C to 900°C (furnace)
Temperature Uniformity ± 5 °C, NADCAP compliance.
Hot Zone Graphite resistance / Optional Retort hot walled with ceramic insulation
Vacuum range
Vacuum System Rotary-Roots combination
Heating Elements Graphite / Kanthal
Gas Quench up to 5 bar
Instrumentation options Thyristor, Programmable


Model no Hot zone size

W x H x L in mm

Max load weight (kg) Main power in KW Heating Power in KW
TVNF-400 400 x 400 x 600 200 70 50
TVNF-600 600 x 600 x 900 600 120 100
TVNF-900 900 x 900 x 1200 1200 200 165
TVNF-1200 1200 x 1200 x 1200 2400 350 315

TVNF-XXX is for Graphite furnace

TVNF-R-XXX is for Retort design furnace

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