First, the contact fatigue strength
Bearing in the cycle the load, the contact surfaces are prone to fatigue damage, ie cracking spalling, which is the major damage in the form of bearing. Therefore, in order to improve the life of the bearing, the bearing steel must have a high contact fatigue strength.
Second, the wear resistance
Rolling friction occurs not only between the rings, rolling element and cage bearing work, but also sliding friction, so the constant wear of the bearing parts. In order to reduce the wear of the bearing parts, to maintain the stability of the bearing accuracy, extend the life of bearing steel should have a good wear resistance.
Third, the hardness
Hardness is one of the important quality of bearing quality, has a direct impact on the contact fatigue strength, wear resistance, elastic limit. The hardness of bearing steel in the use of state general hrc61 ~ 65, in order to make the bearing contact fatigue strength and wear resistance.
Fourth, anti-rust properties
In order to prevent the bearing parts and finished products in the processing, storage and use of the process of corrosion rust, bearing steel with good anti-rust properties.
Fifth, the processing performance
Bearing parts in the production process to go through a lot of cold, hot working processes, in order to meet high-volume, high efficiency, high-quality requirements, bearing steel and should have good processing properties. For example, cold, hot formability, machinability, hardenability, etc..
Bearing steel in addition to the above basic requirements, but also should reach the appropriate chemical composition, internal organization of the uniform, non-metallic inclusions less, the internal surface defects meets the standards and the surface decarburized layer does not exceed the provisions of the concentration of these projects have in the standard of raw materials clearly defined.
Bearing parts commonly used materials are: carbon chromium bearing steel, carbonized steel (such as 20cr2ni4a, 15mn, 20cr2mnmoa), high temperature bearing steel (such as cr4mo4v, cr14mo4, cr15mo4v, w18cr4v), stainless bearing steel (9cr18 9cr18mo, 1cr18ni9ti) vacuum degassed steel, antimagnetic bearing steel, which is the most commonly used carbon chromium bearing steel. Carbon chromium bearing steel, steel gcr6, gcr9, gcr9simn, gcr15, gcr15simn, it is China's bearing manufacturing industry, the most widely used, the largest amount of steel with good wear resistance and contact fatigue performance, there are more ideal processing performance, with a certain degree of flexibility and toughness.



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