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Air Liquide in the UK

Automotive Value Chain Steps
Select a step where Air Liquide intervenes in your value chain.

Carburizing and carbonitriding

During carburizing (carbonitriding) operations, carbon and nitrogen is brought to the surface of steel components and diffused to produce a hard martensitic surface layer after quenching. Traditionally, the carbon comes from a hydrocarbon, natural gas or propane, partly oxidized in an endogas generator to produce a carbon/hydrogen atmosphere.

For nitriding, the nitrogen agent comes from ammonia cracking at the surface. Nitrogen accelerates the diffusion of carbon into the treated parts. The ALNAT solution offers you an active and reproducible heat treatment under nitrogen and methanol. Either in a batch or in a continuous furnace, the methanol is cracked and represents the carbon agent, which is sprayed with nitrogen in the hot zone of the furnace, around 900°C for carburizing and 880°C for carbonitriding.



Our solutions include bulk gas supply, related gas handling equipment, and a range of services related to the generation, use and control of atmospheres in industrial heat processing furnaces.