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Carburizing, Nitriding, and Hardening

Expert solutions to help you succeed

Air Products’ Atmosphere Solutions are available for carburizing, neutral hardening, carbonitriding, nitriding and nitrocarburizing. Nitrogen, methanol, and/or a small amount of enriching gas are blended at the furnace to provide a furnace atmosphere essentially identical in composition to that of endothermic. By varying the amount of enriching gas, the furnace carbon potential can be adjusted to meet your specific atmosphere requirements. The benefit of Air Products’ Atmosphere Solutions is superior atmosphere control for consistent part quality, operational cost savings, significant increases in operational productivity, and ease of operation.

Download Atmosphere Solutions for Metals Processing brochure

​Industrial Gases from a Global Leader

  • Global leading manufacturer of nitrogen, oxygen, and argon
  • World leading producer and supplier of hydrogen and helium
  • Reliable supply of industrial gases
  • Excellent record of meeting on-time needs
  • Industry leader in safety
  • Technical support when you need it
  • World-class customer service

Heating Treating Solutions

Air Products offers a wide range of technologies, gases, equipment, and cutting edge solutions for the heat treating industry.

​​Carburizing, Nitriding, and Hardening Expertise and Solutions

Improved operational efficiency and safety

A control system increases flow with a nitrogen purge during charging, quenching, or furnace malfunction, enhancing operation efficiency and safety

Reduced costs

Elimination of endo-generation and its associated maintenance produces the greatest impact on cost reduction

Customized high-pressure gas storage

High-pressure gas storage is custom designed and optimized to meet the specific requirements of the process and quench frequency

High-pressure gas quenching solutions

Gas supply systems up to 40 bar using nitrogen, argon, or helium are available

Controlled furnace carbon potential

The furnace carbon potential can be adjusted to meet your specific atmosphere requirements

Improved quality of carburized, nitrided, or hardened components

Air Products' Atmosphere Solutions for carburizing, nitriding, and hardening provide an excellent means to improve the quality of metal products

Ask the Expert

Guido Plicht

Commercial Technology Manager - Europe

“How can I achieve a more homogeneous surface hardness in controlled-atmosphere carburizing?”

In atmosphere-carburized parts, especially bulk loads, variations in surface hardness might appear. This is a common issue caused by insufficient atmosphere circulation inside the furnace chamber and through the load. At Air Products our atmosphere flow modelling capabilities enable us to simulate and solve these technical barriers. Our specialists can work with you to find the best way to modify the load set-up, thus improving the carburizing results.

Download Nitrogen-Propane Protective Atmospheres for Annealing and Hardening Operations in Continuous Furnaces

Each Atmosphere Solution is Customized for Your Needs

We can help you choose the right atmosphere composition.

  • Select and provide blending and flow control equipment
  • Perform on-site atmosphere analyses for consistent dimensional control, carbon control, and physical and metallurgical properties
  • Optimize your furnace process to lower operating costs
  • Perform state-of-the-art metallographic and chemical analyses (SEM, ESCA, SAM, ISS, SIMS)
  • Provide safety training
  • Test atmospheres using your parts in our lab furnaces
  • Demonstrate our system at your facility
Learn More

Get in touch with our technical experts.

Put decades of experience with industrial gases, production, applications and equipment to work for you.

Contact us

Gas Supply Options


Compressed argon gas and liquid argon in a variety of purities and in various modes of supply around the world thanks to our network of storage and transfill facilities.


An inert gas for cryogenic, heat transfer, shielding, leak detection, analytical and lifting applications


Valued for its reactive and protective properties, and used by many industries such as electronics, foods, glass, chemicals, refining and more can benefit from its unique properties to improve quality, optimize performance and reduce costs.


Useful as a gas, for its inert properties, and as a liquid for cooling and freezing. Virtually any industry can benefit from its unique properties to improve yields, optimize performance and make operations safer.