Influence of operating temperature
The dimensions of a bearing in operation change as a result of structural transformations within the material. These transformations are influenced by temperature, time and stress. To avoid inadmissible dimensional changes in operation due to the structural transformation, bearing materials are subjected to a special heat treatment (stabilization) process (table).
Depending on the bearing type, standard bearings made from through-hardening and induction-hardening steels have a recommended maximum operating temperature, between 120 and 200 °C. These maximum operating temperatures are directly related to the heat treatment process. Where applicable, additional information is found in the introductory text of the product section.
If the normal operating temperatures of the application are higher than the recommended maximum temperature, a bearing with a higher stabilization class is preferred.
For applications where bearings operate continuously at elevated temperatures the dynamic load carrying capacity of the bearing may need to be adjusted. For further information please consult the SKF application engineering service.
The satisfactory operation of bearings at elevated temperatures also depends on whether the chosen lubricant will retain its lubricating properties and whether the materials used for the seals, cages etc. are suitable, see sections Lubrication and Materials for rolling bearings.
In general bearings operating at high temperatures require higher stability class than S1, contact the SKF application engineering service.