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In the high pay should contact under the long-term work stress. The site is host to the harmful effects of heart or joint etc.. The accuracy, life and reliability of the host is determined largely by bearing. As the support of all kinds of mechanical movement, the working environment of the bearing may be ultra high temperature (>1000 ℃), the ultra low temperature (-253 ℃), strong corrosion (acid, alkali, aqua regia and high temperature caustic soda etc.) and ultra high vacuum (1.33 × l0-9Pa), may also be a strong shock, strong abrasive wear, no magnetic and ultra high speed (DMN value of 2.2 × 106) etc.. Harsh environmental requirements may be single, may also be integrated a variety of complex conditions, whether ordinary bearings or special bearing, hosts are put forward very high requirements on its service life, performance and reliability. Many factors affect the service life of the bearing, the materials and heat treatment, the proportion of large.
The bearing characteristics of the structure and the working condition requirements of bearing materials must have high hardness, high wear resistance, high contact fatigue strength, high elastic limit, good impact toughness, good fracture toughness, good dimensional stability, good rust resistance and good machinability. To ensure the {TodayHot} of these performance requirements, with the metallurgical quality of bearing steel must ensure that the chemical composition of strict, especially high purity (non metallic inclusions in low level), oxygen content and residual element content is extremely low, low times microstructure strict and high times (Xian Wei) organization, strict carbide inhomogeneity, the surface decarburized layer and internal porosity, segregation, Xian Wei pore stringent requirements; does not allow the existence of cracks, slag, burrs, folding, scarring, oxide skin, shrinkage, bubbles, since the point and the burning surface and internal defects. To ensure the machining performance, dimension precision of steel also has strict requirements. Bearing steel quality is the most stringent inspection items, most steel requirements all in alloy steel. World, bearing steel level is a sign of national metallurgical level. Metallurgical technology the new general first in bearing steel development and production application.
In recent years, industrial developed countries for the development and production of steel in the bearing can be roughly divided into two aspects: on the one hand, the new smelting technology and equipment, or to the traditional smelting process and equipment improvements, reduce the amount of oxygen content and inclusions in the steel, distribution, size and morphology of improvement inclusion, improve the crystalline state, in order to improve the quality of original steel metallurgy, production of long-life, pure or super Gao Jie clean steel; on the other hand, the improvement and development of the new bearing steel chemical composition of the steel, in order to meet the performance requirements of different occasions for bearing more and more, reducing the costs of materials in the premise or has the same properties and the bearing production cost.