Roller bearings are key components in transmission machinery equipment that support rotating parts, reduce friction, and ensure their rotational accuracy. They have automatic centering function and include two types: self-aligning ball bearings and self-aligning roller bearings. The former compensates for installation errors through a spherical structure, while the latter adopts a double row roller design to adapt to heavy load conditions and is applied in the fields of metallurgy, wind power, and mining machinery.
1、 Under cyclic loading, contact fatigue strength bearings are prone to fatigue damage on the contact surface, resulting in cracking and peeling, which is an important form of bearing failure. Therefore, in order to improve the service life of bearings, bearing steel must have high contact fatigue strength. 2、 During the task of wear-resistant bearings, not only rolling friction but also sliding friction occurs between the ring, rolling elements, and support frame, resulting in continuous wear of the bearing components. In order to increase the wear of bearing components, maintain the stability of bearing accuracy, and extend the service life, bearing steel should have good wear resistance. 3、 Hardness is one of the important qualities of bearing quality, which indirectly affects contact fatigue strength, wear resistance, and elastic limit. The hardness of bearing steel under certain operating conditions should reach HRC61~65, which enables the bearing to achieve high contact fatigue strength and wear resistance. 4、 In order to prevent corrosion and rust of bearing parts and finished products during processing, storage, and use, it is required that bearing steel should have good rust prevention performance. 5、 In the consumption process of bearing parts, they need to go through many cold and hot processing procedures. In order to meet the requirements of small quantities, high efficiency, and high quality, bearing steel should have good processing performance. For example, cold and hot forming performance, cutting performance, hardenability, etc. In addition to the basic requirements mentioned above, bearing steel should also meet the requirements of appropriate chemical composition, average external structure, minimal non-metallic impurities, compliance with specifications for external surface defects, and the decarburization layer on the surface not exceeding the regular concentration.
