Sub-zero Treatments

For Parts that Last Longer

Sub-zero treatments can be broadly grouped into cold and cryogenic processes. These two categories impact steel in different ways. Cold treatment completes the metallurgical phase transformation of austenite to martensite during the hardening of steels following quench and temper heat treatments. By contrast, cryo treatments use temperatures below -120°C to create the ideal conditions for the subsequent nucleation of very fine carbides in higher-alloy steels.

Removal of retained austenite in martensitic steels is typically applied in tool and machine manufacturing. In addition, long-term cryogenic treatments are used to modify carbide structure in tools, measuring equipment and similar.

Sub-zero temperatures are also used to shrink-fit metallic components such as shafts, pinions and bushings used in industries as diverse as machine building, energy and automotive. This process works by taking advantage of the temporary change in dimensions when a part is cooled (the shrink effect).

Our proprietary line of CRYOFLEX^® freezers utilizes liquid nitrogen (LIN) as the cooling medium and is available in a range of models for individual needs. We also supply solid carbon dioxide (dry ice) for certain sub-zero treatments.