Rolling bearing is a type commonly used in our daily life. Rolling bearing is mainly composed of outer ring, inner ring, rolling body and cage.For rolling bearing ring and rolling body, the choice of material is very important, these two parts can determine the performance of rolling bearing use, we can choose according to the needs of rolling bearing ring and rolling body material.

1, high carbon chromium bearing steel The vast majority of bearing rings and rolling bodies are made of special steel.High carbon chromium bearing steel (GCr15 and GCr15SiMn and ZGCr15 and ZGCr15SiMn) is used to manufacture the ring and rolling body, and the hardness of its parts is as follows:

The rings and rollers made of GCr15 and ZGCr15 are HRc61~65, and the steel balls are HRc62~66.

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

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

High carbon chromium bearing steel bearing parts can adapt to working temperature up to 250 degrees after heat recovery.

2, carburized bearing steel

The hardness of the ring and rolling body made of carburized bearing steel is HRc60~64, which is generally suitable for the operating temperature range of -40~140 degrees Celsius. Oil and grease lubrication is normal, and it can be used under large impact vibration conditions, such as locomotive and rolling mill bearings, but the heat treatment process of the steel is more complex.

3, heat resistant bearing steel

The hardness of the rolling body of the ring made of heat-resistant bearing steel: the ring and roller are HRc60~64, and the steel ball is HRc61~65. Under the condition of normal lubrication, it is suitable for the working temperature of 120~250 degrees Celsius, such as aeroengine, gas turbine and other spindle working conditions.

4, corrosion resistant bearing steel

The hardness of the ring and rolling body made of corrosion resistant bearing steel is: the ring and rolling body should not be lower than HRc58, suitable for water, nitric acid, chemical reagents and other corrosive media, the temperature is -253~350 degrees Celsius.