Application of new technology of bearing steel

Bearing steel is mainly used in the manufacture of rolling bearings of rolling body and ring. Due to bearing should have long life, high precision, low calorific value, recommend suite, high rigidity, low noise, high abrasion resistance and so on characteristics, therefore requires bearing steel should have: high hardness, uniform hardness, high elastic limit, high contact fatigue strength, must be certain hardenability and tenacity, in the atmospheric corrosion resistance of lubricant. In order to achieve the performance requirements, the uniformity of the chemical composition of bearing steel, non-metallic inclusion content and type, strict carbide particle size and distribution, decarburization, etc. Bearing steel in general to develop in the direction of high quality, high performance and many varieties. According to the characteristics and application environment of bearing steel is divided into: high carbon chromium bearing steel, high temperature carburizing bearing steel, bearing steel special bearing, stainless bearing steel and special materials. In order to adapt to high temperature, high speed, high load, corrosion resistance, resistance to radiation, need to develop a series of new type of bearing steel with special performance. To decrease the oxygen content of bearing steel, the development of the vacuum smelting, esr, electron-beam remelting of bearing steel smelting technology. And the mass of bearing steel smelting electric arc furnace smelting, early developed into all kinds of smelting and refining outside the furnace. Since the 1990 s, when economic development and industrial technology progress, application scope of bearing; And the development of international trade, and promote the internationalization of bearing steel standard and new technology, new technology and new equipment development and application of high efficiency, high quality and low cost of supporting technology and process equipment arises at the historic moment. Japan and Germany are built high cleanliness, high quality of bearing steel production line, make the output of steel increased rapidly, the quality of the steel and greatly improve the fatigue life. Japan and Sweden, production of bearing steel oxygen levels fall below 10 PPM. Bearing contact fatigue life is sensitive to the uniformity of steel group. Improve cleanliness, Reduce the impurity elements in the steel and inclusion content) , a few prompted non-metallic inclusions in steel and carbide tiny uniform distribution, can improve the contact fatigue life of the bearing steel. Bearing steel using state organization should be tempered martensite matrix uniformly distributed on the fine carbide particles, such organizations can give the performance of the bearing steel needed. High carbon steel bearing the main alloy elements carbon, chromium, silicon, manganese, vanadium, etc. How to get the ball organization is an important problem in bearing steel production, controlled rolling of cooling is one of the important production technology advanced bearing steel. By controlled rolling and cold rolling, quick to eliminate carbide network and obtain appropriate preparation group, bearing steel ball annealing can shorten the time, carbide, improve the fatigue life. In recent years, Russia and Japan with low temperature rolling ( Below 800 ℃ ~ 850 ℃) Adopts air cooling after rolling, short time annealing, or completely cancel the spheroidizing annealing process and can be qualified bearing steel group. Bearing steel 650 ℃ temperature processing and new technology. If before the eutectoid steel or high carbon steel hot working with fine grained organization or in the process to form a fine grained, while ( 0. 4 to 0. 6) Melting temperature range, under a certain strain rate, exhibiting the plastic. The us navy research institute ( NSP） Of 52100 steel