Bearing seamless steel pipes are also called high-carbon chromium seamless steel pipes. The carbon content Wc is about 1%, and the chromium content Wcr is 0.5%-1.65%. Bearing seamless steel tubes are divided into six types: high-carbon chromium bearing seamless steel tubes, chromium-free bearing seamless steel tubes, carburized bearing seamless steel tubes, stainless bearing seamless steel tubes, medium and high temperature bearing seamless steel tubes, and antimagnetic bearing seamless steel tubes.
High-carbon chromium bearing seamless steel pipe GCr15 is the world’s largest production of bearing seamless steel pipe. The carbon content Wc is about 1%, and the chromium content Wcr is about 1.5%. Since its birth in 1901, it has basically no main components for more than 100 years. Change, with the progress of science and technology, research work continues, product quality continues to improve, accounting for more than 80% of the world's total production of seamless bearing steel pipes. So if there is no special description for bearing seamless steel pipe, it refers to GCr15.
Bearing seamless steel tubes are steel used to make balls, rollers and bearing rings. Bearing seamless steel pipes have high and uniform hardness and wear resistance, as well as high elastic limit. The requirements for the uniformity of the chemical composition of the bearing seamless steel pipe, the content and distribution of non-metallic inclusions, and the distribution of carbides are very strict. It is one of the most stringent steel grades in all steel production.
In order to meet the above requirements for the performance of dynamic bearings, the following basic performance requirements are proposed for bearing seamless steel pipe materials:
1) High contact fatigue strength
2) After heat treatment, it should have a high hardness or a hardness that can meet the performance requirements of the bearing
3) High wear resistance, low friction coefficient
4) High elastic limit
5) Good impact toughness and fracture toughness
6) Good dimensional stability
7) Good anti-rust performance
8) Good cold and hot processing performance
Main standards for bearing steel pipe:
ASTM A 295: wearable high-carbon bearing steel pipe
ASTM A 534: wearable and cementite bearing seamless steel pipe
JIS G 4805: high-carbon chromium bearing seamless steel pipe
DIN 17230: ball bearing steel pipe
NF A 35-565: steel product
Steel grades of bearing steel Pipe:GCr15 (52100, SUJ2, SUJ3, 100Cr6, SKF3, SKF3S), 20CrNiMo (8620H, 4118H).
