Material selection of rolling bearing ring and rolling element

Rolling bearing is a type often used in our daily life. Rolling bearing is mainly composed of outer ring, inner ring, rolling element and cage. For the ring and rolling element of rolling bearing, the material selection is very important. These two parts can determine the performance and use of rolling bearing. We can select the material that meets the requirements of rolling bearing ring and rolling element.

1. High carbon chromium bearing steel

Most bearing rings and rolling elements are made of special steel. High carbon chromium bearing steels (GCr15 and GCr15SiMn and ZGCr15 and ZGCr15SiMn) are used to manufacture rings and rolling elements. The hardness of the parts is as follows:

The ferrules and rollers made of GCr15 and ZGCr15 materials are HRc61-65, and the steel balls are HRc62-66;

The ferrules and rollers made of GCr15SiMn and ZGCr15SiMn materials are HRc60~64, and the steel balls are HRc60~66.

Bearings made of high carbon chromium bearing steel are generally applicable to the working temperature range of - 40~130 degrees, and the oil and grease lubrication is normal. It can meet the requirements of general machinery.

After the bearing parts of high carbon chromium bearing steel are backfired at high temperature, their adaptive working temperature can be as high as 250 ℃.

2. Carburized bearing steel

The hardness of rings and rolling elements made of carburized bearing steel is HRc60~64, which is generally suitable for the working temperature range of - 40~140 ℃. The oil and grease lubrication is normal, and they can be used under large impact and vibration conditions, such as bearings for locomotives and rolling mills. However, the heat treatment process of this steel is relatively complex.

3. Heat resistant bearing steel

The hardness of the rolling element of the ferrule made of heat-resistant bearing steel: the ferrule and roller are HRc60~64, and the steel ball is HRc61~65. Under normal lubrication conditions, it is applicable to the working temperature of 120~250 ℃, such as the working conditions of the main shafts of aeroengines, gas turbines, etc.

4. Corrosion resistant bearing steel

The ferrules and rolling elements are made of corrosion-resistant bearing steel. Their hardness is: the ferrules and rolling elements should not be lower than HRc58. They are suitable for corrosive media such as water, nitric acid and chemical reagents. The temperature is - 253~350 ℃.