Rolling bearing parts to contacts or line contact form, in the high pay should contact stress long-term work. The world bearing industry on the formation and development of the work in the heart of the host position or joint etc to harm. The precision of the host, life and reliability to a large extent depends on bearing. As all kinds of mechanical motion of supporting, bearing working environment may be super high temperature (> 1000 ℃), cryogenic (253 ℃), strong corrosion (acid, alkali, wang, s. and high temperature, disliked the sex, etc) and ultra-high vacuum (1.33 by l0-9 Pa), also may be strong, strong abrasive wear, impact without magnetic and ultra-high speed (DMN value of 2.2 x 106 above), and so on. Strict environmental requirements may be single, also may be various composite of bad conditions comprehensive, Germany FuLe bearing up product security labels and bearing packaging whether ordinary bearing or special bearings, the host of the life, performance and reliability are put forward very high demand. Bearing life many influencing factors, among them material and heat treatment accounts for the portions are huge.

Installation import bearings and the four note bearing structure characteristics and working conditions demand bearing material must have high hardness and high wear resistance, high contact fatigue strength, high elastic limit, good impact toughness, good fracture toughness, good size stability, good rust resistance and good cold heat processing property, etc. To ensure that these performance requirements, bearing steel metallurgical quality must ensure that strict chemical composition, especially high grade (low-level non-metallic inclusions), very low oxygen content and residual element content, strict macrostructure and at high magnification (micro) organization, strict carbide inhomogeneity, strict surface decarburization layer and internal loose, segregation, microscopic pores and requirements; Import bearings must use clean gasoline or kerosene careful cleaning don't allow the existence cracks, slag inclusion, burr, folded in half, scarred, oxide skin, shrinkage, bubble, since the point and a burning, and the surface and inner defects. To ensure the process performance, the steel size accuracy also has the strict request. Bearing steel quality is all in the most strict requirements, alloy steel inspection items most of the material. The world recognized, bearing steel level is a national metallurgy level of signs. The latest metallurgy techniques are generally first in steel bearing the development and production of use.

In recent decades, import bearings are demanding job clearance developed countries in bearing steel development and production application can be roughly divided into two aspects: on the one hand, by using of the new smelting technology and equipment, or to the traditional smelting process and equipment to improve, reduce the oxygen content in steel and inclusion quantity, improve the distribution of inclusion, size and shape, improve the crystalline state, etc, in order to improve the quality of the original kind of metallurgy, production long life, pure or ultra clean steel; On the other hand, to the original kinds of chemical composition of improve or develop new bearing steel, in order to meet different occasions to use more and more high bearing performance requirements, or with the same performance in the premise of the bearings reduce the material cost and the cost of production.



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