Bearing steel and direction of new technologies

Rolling bearing steel is mainly used in the manufacture of rolling elements and rings. Since the bearing should have a long life, high-precision, low-calorie, high-speed, high rigidity, low noise, high wear resistance and other characteristics, thus requiring bearing steel should have: high hardness, uniform hardness, high elastic limit, high contact fatigue strength, toughness must certainly hardenability in atmospheric corrosion lubricant. To achieve the above performance requirements, self aligning roller bearings steel chemical composition uniformity, the non-metallic inclusion content and type, carbide size and distribution, and other demanding decarburization. Bearing steel development to high-quality, high performance and multi-species overall direction. Bearing steel according to the characteristics and application environments are divided into: carbon chromium bearing steel, carburizing bearing steel, high temperature bearing steel, stainless steel and cross roller bearings special bearing materials.
To meet the high-temperature, high-speed, high load, corrosion, anti-radiation, and the need to develop a new range of bearing steel with special properties. In order to reduce the oxygen content of bearing steel, the development of vacuum smelting, ESR, electron beam remelting bearing steel smelting technology. The large quantities of wind power bearing steel smelting by arc melting, develop into various types of early foreign refining furnace plus. Currently, the use of a capacity greater than 60 tons beginning furnace + LF / VD or RH + casting + rolling bearing steel production process in order to achieve high-quality, high efficiency, low energy consumption purposes. In terms of the heat treatment process, by car bottom furnace, bell furnace developed into a continuous annealing furnace controlled atmosphere heat treatment. Currently, the longest continuous heat treatment furnace for 150m, processing and production of steel ball bearings organizational stability and uniformity, decarburization small, low energy consumption.