VTN Advantage:

VT-N-Ox®

1. The process
VT-N-Ox® is a gas nitrocarburizing process with oxidization, optimized by VTN. The process achieves an optimum combination of wear protection and corrosion protection. This process is preferentially performed at 570-580°C in a gas mixture of nitrogen and carbon emitting media. The NHD is 0.1-0.35 mm. Partial treatment is possible. The treatment is performed to produce the desired compound layer; the precipitation layer is usually of secondary importance.

2. Suitable materials
All common steel, cast and sinter materials can be treated by nitriding. Non-alloy, low alloy and medium alloy materials are suitable; high alloy materials (> 13% Cr) are mostly unsuitable due to their surface passivity.

3. Tests and testing methods
Hardness is measured in accordance with EN ISO 6507 in HV (Vickers). Nitriding hardness depth (NHD) is measured in accordance with DIN 50190, Part 3. Traditional metallographic testing methods are used to assess the layers.

4. Benefits of this heat treatment

  • Low distortion
  • Little, if any, subsequent processing required
  • High resistance to wear with adhesion
  • Modification of layers to types of wear
  • Reduction in friction coefficients
  • Saving in lubricants
  • Formation of corrosion-resistant layers
  • Thermal stability of nitriding layer to 400°C
  • Partial nitriding possible

5. Customer information required for heat treatment
In addition to the material and the heat treatment prior to nitriding, the following information should be given as quality standards in the production drawing

  • Material- / Material designation
  • Surface hardness in HV (incl. test load)
  • Nitriding hardness layer (NHD) in mm
  • Thickness of the compound layer in µm (VS)
  • Thickness of the oxide layer in µm (VS)
  • Where appropriate, designation of areas that should not be nitrided