Bearing steel, also known as high carbon chromium steel, has a carbon content of about 1% WC and a chromium content of 0.5%-1.65% WCR.Bearing steel is divided into high carbon chromium bearing steel, chromium free bearing steel, carburizing bearing steel, stainless bearing steel, medium and high temperature bearing steel and antimagnetic bearing steel.Bearing steel is used to make balls, rollers and bearing rings.Bearing steels have high and uniform hardness and wear resistance, as well as high elastic limits.Bearing steel has strict requirements on the uniformity of chemical composition, the content and distribution of non-metallic inclusions, and the distribution of carbides, etc. It is one of the most stringent steel types in all steel production.
The bearings performance requirements：
In order to meet the above requirements for the performance of dynamic bearings, the following basic performance requirements are put forward for bearing steel materials:
1.high contact fatigue strength,
2.After heat treatment, it should have high hardness or hardness that can meet the performance requirements of bearings.
3.high wear resistance, low friction coefficient,
4.High elastic limit,
5.Good impact toughness and fracture toughness
6.good dimensional stability,
7.good rust resistance,
8.good cold and hot processing performance.
Manufacturing requirements
The content of inclusions is closely related to the oxygen content in steel. The higher the oxygen content is, the more inclusions there are and the shorter the life is.Inclusions and carbide particle size and distribution is uneven, the greater the shorter service life also, and their size, distribution and use of smelting process and refining quality is closely related to the production of bearing steel is the main process of continuous casting and smelting electric furnace + esr process of smelting, and a small amount of the use of vacuum induction + vacuum consumable double process such as vacuum consumable or + many times to improve the quality of bearing steel.High demand for the quality of bearing steel smelting, sulfur, phosphorus, and hydrogen content must be strictly controlled, and the number of non-metallic inclusions and carbide, size and distribution of non-metallic inclusions and carbide because the number, size and distribution of a great influence on the service life of bearing steel, bearing failure is often around the large inclusions or carbide produced by micro crack propagation.
People have grasped that in order to improve the performance of TIMKEN bearing steel and meet the above requirements, it is necessary to smelt very high purity iron carbon alloy steel, and then participate in a certain number of carbon, chromium, silicon, manganese, vanadium and other alloys, and make the corresponding heat treatment, you can get the bearing steel that meets the requirements.Rolls Bearing Limited is committed to Bearing steel research for decades, to fully meet customer needs!