Rolling bearings are a type commonly used in our daily lives. Rolling bearings are mainly composed of outer rings, inner rings, rolling elements and cages. For the rings and rolling elements of rolling bearings, the selection of materials is very important. These two major components can determine the performance of rolling bearings. We can choose materials that meet the needs of rolling bearing rings and rolling elements. 1. High carbon chromium bearing steel Most bearing rings and rolling elements are made of special steel. Rings and rolling elements are made of high carbon chromium bearing steel (GCr15 and GCr15SiMn and ZGCr15 and ZGCr15SiMn). The hardness of the parts is as follows: Rings and rollers made of GCr15 and ZGCr15 materials are HRc61~65, and steel balls are HRc62~66; Rings and rollers made of GCr15SiMn and ZGCr15SiMn materials are HRc60~64, and steel balls are HRc60~66. Bearings made of high-carbon chromium bearing steel are generally suitable for operating temperatures in the range of -40 to 130 degrees, and oil and grease lubrication are normal. Can meet the requirements of general machinery. After high-carbon chromium bearing steel bearing parts are tempered at high temperatures, they can adapt to working temperatures as high as 250 degrees. 2. Carburized bearing steel The hardness of rings and rolling elements made of carburized bearing steel is: HRc60~64 for rings and rolling elements. They are generally suitable for operating temperatures in the range of -40~140 degrees Celsius. Oil and grease lubrication is normal and can be used in It is used under conditions of large shock and vibration, such as bearings for rolling stock and rolling mills, but the heat treatment process of this steel type is relatively complex. 3. Heat-resistant bearing steel The rolling elements of the rings made of heat-resistant bearing steel have hardnesses: the rings and rollers are HRc60~64, and the steel balls are HRc61~65. Under normal lubrication conditions, they are suitable for working temperatures of 120~250 degrees Celsius. Such as the working conditions of main shafts of aircraft engines, gas turbines, etc. 4. Corrosion-resistant bearing steel The rings and rolling elements are made of corrosion-resistant bearing steel. The hardness of the rings and rolling elements is: the rings and rolling elements should not be lower than HRc58. They are suitable for corrosive media such as water, nitric acid, chemical reagents, etc., and the temperature is -253~350 degrees Celsius.  

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