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Rolling bearing parts in the form of point contact or line contact at the high post should contact stress under long-term work. Its work is part of multi-host of the heart or joints to harm. Accuracy of the host, is largely determined by the life and reliability of the bearing. As the support of various mechanical movement, the bearing may be ultra-high temperature environment (> 1000 ℃), ultra-low temperature (-253 ℃), strongly corrosive (acid, alkali, high temperature and caustic soda, and aqua regia, etc.), and ultra high vacuum (1.33 × l0-9Pa), it could be a strong impact, high abrasion, non-magnetic and ultra-high-speed (dmn value of 2.2 × 106 or more), and so on. Stringent environmental requirements may be individual, it could be a variety of complex integrated harsh conditions, whether general or special bearings bearing host its life, performance and reliability are high demands. Many factors bearing life, material and heat treatment which occupied portions are huge.

Bearing structural characteristics and working conditions of the bearing material must have a high hardness, high wear resistance, high contact fatigue strength, high elastic limit, a good impact toughness, good fracture toughness, good dimensional stability , good rust resistance and good hot and cold processing performance. {TodayHot} guarantee the performance requirements for the metallurgical quality bearing steel must ensure strict chemical composition, particularly high purity (low level of non-metallic inclusions), low oxygen content and the content of residual elements strictly low magnification and high power (micro) organization, strict carbide inhomogeneity, strict internal surface decarburization and loose, segregation, microscopic pores and other requirements; no cracks, slag, burrs, folded knot scar, oxide, shrinkage, bubbles, etc. from the point and burnt surface and internal defects. To ensure the workability of the dimensional accuracy of steel, there are strict requirements. Quality bearing steel is the most demanding of all alloy steels, steels up to test items. Recognized worldwide, the level of bearing steel is a symbol of national metallurgical level. The latest metallurgical techniques are generally applied first on the development and production of bearing steel.

In recent decades, industrialized countries in the development and application of bearing steel production can be broadly divided into two aspects: on the one hand, the introduction of new smelting technology and equipment, or the traditional smelting technology and equipment improvements to reduce steel the oxygen content and the number of inclusions to improve the distribution, size and shape of inclusions to improve the crystallinity so as to improve the metallurgical quality of the original steel, the production of long life, pure or ultra clean steel; the other hand, the original chemical composition of the steel to improve or develop new bearing steel to meet different occasions bearing increasingly high performance requirements, or to reduce production costs and material costs in the context of the entire bearing has the same properties.