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Cryogenic liquid/gas spraying from a nozzle

Cryo-tempering System

Expert solutions to help you succeed

​Cryo-tempering Solutions and Expertise

Applying innovation and expertise to solve our customers’ problems is a core strength

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Meet demanding product specifications

Use cryo-tempering to increase wear resistance and hardness of metallic parts, such as gears, brake rotors, and bearings

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Equipment tailored to your specific needs

We can recommend equipment that can meet your demanding specifications

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Cryogenic liquid supply

Air Products engineering teams can provide safe and efficient cryogenic piping system designs

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Reliable and secure supply

Leading supplier of liquid nitrogen and helium with excellent record of meeting on-time delivery needs

Ask the Expert

Liang He - Metals Processing R&D Engineer
Liang He

Metals Processing R&D Engineer, North America

Why would I want to cryogenically treat tool steels? Does it really affect the microstructure?

After austenitizing and quenching, tool steels are sometimes subjected to cold treatment at approximately –80°C (-112°F), followed by tempering. Primarily, the cold treatment is done to increase strength, improve dimensional or microstructure stability, and improve wear resistance. These benefits are due to the transformation of retained austenite to martensite. Some studies show that lowering the cold treatment temperature below –100°C (–148°F) does not significantly increase the amount of retained austenite-to-martensite transformation—therefore it does not result in additional benefits. However, other studies show that compared to cold treatment (–80°C/-112°F), cryogenic treatment (–190°C/-310°F) further improves wear resistance.

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Cryogenic Quenching of Steel Revisited

Cryogenic treatments of alloy steels have been claimed to significantly increase wear resistance and toughness through the interplay of three effects: completing martensitic transformation, promoting uniform precipitation of fine carbides and imparting residual stresses.

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