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Steel for bearings

2015-09-16

Generally speaking, the steel used for bearings is called bearing steel. Bearing steel is also called high carbon chromium steel, with carbon content Wc of about 1% and chromium content Wcr of 0.5%-1.65%. Bearing steel is the steel used to manufacture balls, rollers and bearing rings. Bearing steel has high and uniform hardness and wear resistance, as well as high elastic limit. The requirements for the uniformity of the chemical composition of bearing steel, the content and distribution of non-metallic inclusions, and the distribution of carbides are very strict, and it is one of the most stringent grades in all steel production.

The first type of bearing steel in the world is GCr15 steel (ASTM 52100), which belongs to high-carbon chromium steel. After quenching and tempering, it has high hardness, high wear resistance and high fatigue performance. Its production still accounts for more than 80% of the total annual output of domestic bearing steel. However, in some need to use large and medium-sized or very large bearings in the metallurgical chemical industry, wind turbines, aerospace and other fields, full hardened bearing steel has been unable to meet the requirements of higher impact toughness, longer contact fatigue life and bending fatigue life, therefore, carburized bearing steel came into being, the following is a brief introduction to China carburized bearing steel grades and their chemical composition.