Typically, the operating temperature above 150 degree for use as high temperature bearings bearings. As the chromium bearing steel in the use temperature exceeds 150 degree ~ C, its hardness to a sharp decline in the size of instability and lead to bearing not work properly. So for working temperature 150 degree ~ E ~ 250 degree work under the conditions of the bearings, if the rings and rolling bodies still use an ordinary high carbon chromium bearing steel, you must be a special part of the bearing temperatures, the general should be higher than Work carried out under the tempering temperature of 50 degree. Tempered by the above requirements through the bearing steel, can be used in the normal operating temperature. But tempering the hardness decreased, Bearing life decreased. When the bearing operating temperature higher than 250 degree, the temperature of the bearing must be steel. In addition to high-temperature bearing steel, bearing steel should be of general performance, but also has some high-temperature hardness and high wear resistance, high contact fatigue strength, oxidation resistance, high impact resistance and high temperature dimensional stability. Have used high-temperature bearing steel: Molybdenum steel: Cr4M04V\Crl5M04\9Crl8Mo\Crl4M04; Tungsten steel: W9Cr4V2Mo\W18Cr4V; Tungsten molybdenum: W6MoSCr4V2. High-temperature bearing steelW\Cr\V\MoAnd so can form insoluble carbide at high temperatures, And the tempering time to disperse carbide precipitation, resulting in secondary hardening effect, so that a certain type of steel has a higher temperature, hardness, wear resistance, strong anti-oxidation performance, high fatigue resistance and dimensional stability. High-temperature bearing steel of which Cr4M04V and W18Cr4V most commonly used. The complex structure and the need to sustain the great impact load bearing, can use high-temperature carburizing steel. 12Cr2Ni3M05 is a better performance of high temperature carburizing bearing steel, because of its low carbon content (0.15%), and there is no uniform carbides defects, annealing of low hardness, good machinability, high toughness, can be forging good, can increase the bearing parts of the forging ratio is conducive to the bearing service life, after carburization temperature of 430 ~ C to meet the following conditions of use and has good shock resistance. H10Cr4M04Ni4VA is the best high performance carburizing bearing steel, but its price is more expensive. When the bearings use temperatures in excess of 500 ~ E, choose high temperature bearing steel has been difficult to meet their performance requirements, but should be used cobalt, nickel based alloys or ceramic materials such as high temperature. High temperature bearings is mainly used for aviation jet engines, gas turbines, nuclear reactor systems, X-ray tube tungsten plate, and high-speed aircraft, rockets, spaceship.