Bearing steel pipe is mainly used to manufacture rolling bearings and rings.
Because bearings should have long life, high precision, low caloric value, high speed, high rigidity, low noise, high wear resistance and other characteristics, it is required that bearing steel pipes should have: high hardness, uniform hardness, high elastic limit, high contact fatigue strength, necessary toughness, certain hardenability, corrosion resistance in atmospheric lubricants. In order to achieve the above performance requirements, the chemical composition uniformity, non-metallic inclusion content and type, carbide size and distribution, decarbonization and other requirements are strict.
Because bearings should have long life, high precision, low caloric value, high speed, high rigidity, low noise, high wear resistance and other characteristics, it is required that bearing steel pipes should have: high hardness, uniform hardness, high elastic limit, high contact fatigue strength, necessary toughness, certain hardenability, corrosion resistance in atmospheric lubricants. In order to achieve the above performance requirements, the chemical composition uniformity, non-metallic inclusion content and type, carbide size and distribution, decarbonization and other requirements are strict.
Bearing steel pipe generally to high quality, high performance and a variety of direction. Bearing steel is divided into high carbon chromium bearing steel pipe, carburized bearing steel pipe, high temperature bearing steel pipe, stainless bearing steel pipe and special bearing materials according to its characteristics and application environment.
In order to meet the requirements of high temperature, high speed, high load, corrosion resistance and radiation resistance, it is necessary to develop a series of new bearing steel tubes with special properties. In order to reduce the oxygen content of bearing steel pipe, the smelting technologies of bearing steel pipe such as vacuum smelting, electroslag remelting and electron beam remelting have been developed. Large quantities of bearing steel pipe smelting by electric arc furnace smelting, developed into various types of primary smelting furnace and off-furnace refining.
Bearing steel smelting quality requirements are very high, it is necessary to strictly control the content of sulfur, phosphorus, hydrogen and the quantity, size and distribution of non-metallic inclusions and carbide, because the quantity, size and distribution of non-metallic inclusions and carbide have a great impact on the service life of bearing steel, often bearing failure is in large inclusions or carbide around the micro crack propagation.
The cold-drawn steel should be coated with antirust oil. Some domestic manufacturers are in urgent need of goods. They can not be antirust, otherwise they should be deoiled when they are processed into rings. Before leaving the factory, the quality guarantee certificate shall be attached, indicating steel number, furnace number, weight, specification, chemical composition, inspection standard and inspection result, etc.
