A, contact fatigue strength of bearing under the action of cyclic load, the contact surface is easy to fatigue failure, namely appear cracked spalling, this is the main bearing damage forms.
Therefore, in order to improve the service life of the bearing, bearing steel must have a high contact fatigue strength.
Second, the wear-resisting performance bearing work, not only between race, rolling element and cage rolling friction, and sliding friction will occur, so that the bearing parts wear continuously.
To reduce the number of bearing parts wear, keep bearing accuracy stability, prolong the service life, bearing steel should have good wear resistance.
Three, hardness hardness is one of the important quality of bearing quality, the contact fatigue strength, wear resistance, elastic limit has a direct impact.
The hardness of bearing steel in the condition of using general to achieve HRC61 ~ 65, bearing can get high contact fatigue strength and wear resistance.
Four, in order to prevent rust resistance bearing parts and finished products during processing, storage and use of corrosion rust, for bearing steel should have good rust resistance.
Five parts in the process of production, processing performance bearing, passes through many cold and hot working process, in order to meet the requirements of mass, high efficiency, high quality, bearing steel should have good processing performance.
For example, the cold and hot forming properties, machinability, hardenability, etc.
Bearing steel in addition to the above basic requirements, should also reach the appropriate chemical composition, less uniform and internal organization, non-metallic inclusion, internal accord with a standard surface defect and surface decarburization layer does not exceed the prescribed concentration requirements, these projects are clearly defined in the standard of raw materials.
Bearing parts commonly used materials mainly include: high carbon chromium bearing steel, carburized steel (
Such as 20 cr2ni4a, 15 mn, 20 cr2mnmoa)
And high temperature bearing steel (
如Cr4Mo4V、Cr14Mo4、Cr15Mo4V、W18Cr4V)
, stainless bearing steel,
9Cr18、 9Cr18Mo、 1Cr18Ni9Ti)
Magnetic, vacuum degassing steel, bearing steel, such as one of the most commonly used is high carbon chromium bearing steel.
Basic steel grade of high carbon chromium bearing steel are GCr6, GCr9, GCr9SiMn, GCr15, GCr15SiMn, it is the most widely used in bearing manufacturing industry in China, the amount of the largest steel, have good wear resistance and contact fatigue performance, has the ideal processing performance, have a certain elasticity and toughness.
