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Automotive Value Chain
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.

Gas

Brands

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

Why choose us

  • 01

    Diverse offer

    We offer gas cylinders in various volumes and concentrations and all associated gas handling equipment. We also supply bulk volumes and storage solutions, as well as on-site production technologies.

  • 02

    Focus on compliance

    Purity, accuracy, reliability and speed of delivery of our specialty gases improve analysis reliability for added compliance assurance.

  • 03

    Quality

    Air Liquide manufactures gases in a range of purities to meet your needs. We can analyze for specific impurities based on your request.

  • 04

    Innovation

    Air Liquide’s industry experts are backed by a global R&D network.

  • 05

    Sustainability

    Our ARCALTM, LASALTM and FLAMALTM brand products for metal fabrication were designed with the environment in mind, enabling reduced carbon dioxide and nitrogen oxide emissions.