High temperature bearing steel function

Source: China Bearing Network Time: 2013-02-01

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Generally, bearings with operating temperatures above 150 Â°C are called high temperature bearings. Because chrome bearing steels exceed 150 Â°C ~ C when operating temperature; their hardness will drop sharply; the scale is unstable; and the bearings will not work properly. So about the operation Bearings operating at temperatures between 150 Â° C and E and 250 Â° C; if the ferrules and tumblings are still made of normally high carbon chrome bearing steel; it is necessary to perform special tempering of the bearing parts; usually higher than the operating temperature Tempering at 50 Â° C. Bearing steel treated by tempering according to the above requirements; can be used normally at the working temperature. However, the hardness decreases after tempering; the bearing life decreases. When the bearing operating temperature is higher than 250 Â° Â° Â°; then it is necessary to use high temperature bearing steel.
High-temperature bearing steel should have the function of ordinary bearing steel; it should also have certain high temperature hardness and high temperature wear resistance, high temperature touch fatigue strength, anti-oxidation function, high temperature impact resistance and high temperature dimensional stability. Commonly used high temperature bearing steel Have:
Molybdenum steel: Cr4M04V, Crl5M04, 9Crl8Mo, Crl4M04,
Tungsten steel: W9Cr4V2Mo, W18Cr4V,
Tungsten and molybdenum series: W6MoSCr4V2.
High-temperature bearing steels W, Cr, V, Mo, etc. can constitute insoluble carbides at high temperatures; and in the tempering, dispersed and dispersed carbides can be separated; secondary hardening effect occurs; such steels still have a certain temperature at a certain temperature High hardness, wear resistance, strong anti-oxidation function, high fatigue resistance and dimensional stability. High temperature bearing steel is most commonly used in Cr4M04V and W18Cr4V.
About the disorder of the layout; the bearing that needs to accept the strong impact load; can be made of high-temperature carburized steel. 12Cr2Ni3M05 is a kind of high-temperature carburized bearing steel with better function; because of its low carbon content (about 0.15%); There are defects in carbide non-uniformity; low annealing hardness; good cutting function; high resistance; good forgeability; can increase the forging ratio of bearing parts; beneficial to the service life of the bearing; satisfactory after carburizing Operating conditions below 430~C; and have good impact resistance.
H10Cr4M04Ni4VA is the best high-temperature carburized bearing steel at present; however, its price is more expensive. When the operating temperature of the bearing exceeds 500~E; it is difficult to satisfy the functional requirements of high-temperature bearing steel; instead, it should be cobalt-based or nickel-based. High temperature resistant materials such as alloys or ceramics.
High temperature bearings are mainly used in aviation jet engines, gas turbines, nuclear reactor systems, X-ray tube tungsten discs; and high-speed aircraft, rockets, spacecraft.

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