1. Bearings whose working temperature is lower than -60℃ are low temperature bearings. Mainly used in various liquid pumps, such as liquefied natural gas pumps, liquid nitrogen (hydrogen, oxygen) pumps, butane pumps, liquid pumps for rocket missiles, spacecraft, etc. Commonly used low-temperature bearing structures are mostly single-row deep groove ball bearings and cylindrical roller bearings. Low-temperature bearings are usually made of stainless steel bearing steel 9Cr18, 9Cr18Mo, and can also be made of beryllium bronze, ceramics and other materials.

2. Under extremely low temperature conditions (limit temperature -253℃): when the working limit temperature is -253℃, 6Cr14Mo material can be selected but it must be used in a vacuum environment.