Low Pressure Carburizing - Nitrex
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Low Pressure Carburizing

Low-pressure vacuum carburizing is a state-of-the-art thermal process where carburizing is effected under very low pressures (7-13 mbar). Parts are first heated in vacuum to above the transformation temperature of the alloy and then exposed to carbon-carrying gas, or gas mixtures, under partial pressure. Nitrex has developed a revolutionary process called “Pulse-Pressure”, a method quickly becoming the industry standard.

Relative to conventional carburizing, the main advantages of the method are:

  • Shorter cycle time with tight process control
  • Repeatable results to within ±0.001″ (±25µm)
  • Uniform homogeneity of carburizing case depths
  • Significantly reduced size changes and distortion
  • Improved fatigue strength
  • Better control of the surface layer chemistry
  • Eliminates intergranular oxidation
  • Environmentally friendly process

The basic aspects oF carburizing are described in the Conventional Carburizing section.

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