Definition - What does Gas Carburizing mean?
Gas carburizing is a surface-hardening process that is carried out at a high temperature, usually above 925°C. Carburizing is essentially the addition of carbon at the surface of low carbon steels at appropriate temperatures. Case hardening is achieved with the quenching of the high carbon surface layer that has a good fatigue and wear resistance.
Corrosionpedia explains Gas Carburizing
The process is usually conducted in a sealed quench furnace in which a carburizing gas is introduced. Atomic carbon used in the process is generated by the reaction between the gaseous furnace atmosphere and the steel. The carbon diffuses into the metal surface usually to a depth between 1 and 3mm. After carburizing, the hardness of the carbon-enriched surface is developed by quenching, usually in oil.
Applications include crowns, pinions, screws/bolts, ball bearings and springs, as well as many others.