Carburizing

Superficial enrichment of metal with Carbon to increase resistance.

This thermochemical treatment is an enrichment of a metal surface with carbon, this increases its resistance to wear and fatigue because it creates a superficial layer of martensite.

The phases of this treatment are:

  • Superficial carbon enrichment
  • Oil quench
  • Tempering

It is performed in controlled atmosphere by using mixes of gas (methane, carbon monoxide, hydrocarbon vapors etc.).

Common usages

It enhances the superficial resistance of a piece, usually the carburized pieces are subject to rubbing and wear such as gears, joints, lathe chucks, joints.

It is done on steel with an appropriate chemical composition, therefore steels containing C<0.20% or elements such as Manganese that helps Carbon absorption.

Recommended Furnaces
Pros
  • Increased superficial wear resistance
  • Increased corrosion and oxidation resistance
  • Good internal toughness of the piece
  • Cons