1. Different Material Processes
Low-temperature bearings are processed using special materials and designed with specific structures, following the treatment conditions outlined in JB/T1460-2002 "Heat Treatment Technical Conditions for High Carbon Chromium Stainless Steel Rolling Bearing Parts." On the other hand, common bearings are generally forged from raw materials, undergo heat treatment, grinding, and assembly. The production processes and specific parameter standards for the two types of bearings differ.
2. Varied Material Composition
Low-temperature bearings are commonly made from materials such as stainless bearing steel 9Cr18 and 9Cr18Mo, in accordance with GB/T3086-1982 "Technical Conditions for High Carbon Chromium Stainless Bearing Steel." Alternatively, they can be made from beryllium bronze, ceramics, and other materials. In contrast, common bearings are made from a wider range of materials, including bearing steel, stainless steel, alloys, plastics, and ceramics. The heat generation and low-temperature resistance capabilities of the materials differ between the two types of bearings.
3. Different Operating Temperatures
Low-temperature bearings are designed to operate at temperatures below -60 degrees Celsius, with some materials capable of functioning at temperatures as low as -253°C. The specific operating temperature is determined based on working conditions. Compared to common bearings, low-temperature bearings exhibit better performance in cold environments. Common bearings typically operate at room temperature and may experience operational issues when subjected to low temperatures due to their weaker cold resistance.
4. Varied Friction Coefficients
Low-temperature bearings have lower friction coefficients to minimize heat generation during operation. This characteristic allows them to maintain low temperatures during prolonged operation. In contrast, common bearings are designed to operate at room temperature and permit a certain level of temperature increase, hence not imposing strict requirements on the friction coefficient.
5. Different Lubrication Types
Low-temperature bearings typically use low-viscosity bearing lubricating oil and cannot utilize grease. The selection of lubricating oil is based on its pour point, which must be below -40 degrees to be suitable for use at -40 degrees and below. Therefore, low-temperature bearings have specific requirements for the low-temperature performance of lubricating oil. Common bearings, on the other hand, can use grease or lubricating oil according to specific needs, offering a wider range of options.
6. Varied Application Fields
Low-temperature bearings are primarily used in various liquid pumps, such as liquefied natural gas pumps, liquid nitrogen (hydrogen, oxygen) pumps, butane pumps, liquid pumps for rocket missiles, and spacecraft. Common bearings can be used in mechanical equipment, machine tool spindles, and various mechanical component joints.
In summary, the differences between low-temperature bearings and common bearings encompass material processes, material composition, operating temperatures, friction coefficients, lubrication types, and application fields. These distinctions highlight the specialized nature of low-temperature bearings and their unique suitability for cold environments and specific industrial applications.
The above is the difference between low temperature resistant bearings and ordinary bearings introduced by Lasting Bearing Group Engineer Mr Kevin Tiew. Compared with ordinary bearings, the production technology requirements of low temperature resistant bearings are higher, and our Lasting Bearing Group has rich experience in the production of low temperature bearings, and It meets the requirements for bearings used in low-temperature equipment such as LNG pumps and LPG pumps. If necessary, please call us： +86 15563052809 for more information.
