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1, the chemical composition of strict requirements.
Generally in bearing main carbon chromium bearing steel, carbon steel which is 1, 1%. About 5% of chromium small amounts of manganese and silicon components, eutectoid steel. Chromium can improve the hardenability and the improvement of the performance of the deeply uniform organization through strong stability and antirust function and grinding cutting performance. Chromium content. Strong after quenching when more than 65% increase in the remaining five years of his body, to reduce the number of, hardness and shape stability increase the uneven carbide, also in order to reduce, steel impact resilience and fatigue and menacing. Therefore, chrome steel bearing carbon chromium caliber control as soon as possible in 1, 65%. Ball bearing steel "in strict control, chemical heat treatment of bearing performance organization that must be met.

2, the size of the ultra-precision requirements.
Rolling bearing steel demand ginger in the measurement accuracy is very high, so, I almost bearing parts, after stiffness of pressure. In order to save material and improve labor productivity, for the most part is bearing was ranked fourth hot cold, exercise, and little delay さ driving cold and stiff is heading. If the size of the steel precision is not high, if there is no accurate size and weight of the free) no use accessories complete easy equipment and casting quality bearing model of facts have been confirmed.
3, especially strict with purity.
Steel plate double suicide degrees host non-metallic contains many pure strength the aperture, non-ferrous metal less water. Ball bearing steel acidification and silicate for harmful additives such as bearing early fatigue spalling and significantly reduce the bearing of the main causes of life. Especially brittle crack, water loss, metal machining process, the so-called "matrix stripping down, serious impact on work after add to digest parts in order to improve the quality, the service life of the bearing and the bearing surface reliable bearing steel must be cut to add content.

Yes, strict macro and micro (require) tissue.
Ball of macrostructure, a former President lee teng-hui and running center dip (slightly body check out powerful organization), it is said that organization, extraction of carbide eto 'o and belt and liquid, etc. Carbide brittle firm, a and losses, additive is the same. The impact of the carbon water fishing nets, persistent, to reduce the organization is not only balance is easy to deformation, quenching, and research. Carbon impact and retreat is said to be quenching institutions or contact fatigue and menacing. I, the pros and cons of running organization bearing performance and service life have a huge impact, so the bearing material, and at less than standard requires strict organization.
5, particularly strict surface defects and internal flaws, requirements.
Defects on the surface of bearing steel, etc., to the nest, leather scissors like containing defects such as slag and his internal shrinkage or bubble and release porous and neutral protestant has reached a serious level, etc. These problems are bearing processing, the influence of the bearing performance and life, should express on the standard of bearing material defect, without damage.
6, especially strict with extraction of carbide disequilibrium.
On north Korea if carbon ball strong bias in the process of heat treatment processing water from organization and mild uneven, powerful organization disequilibrium problem is contact fatigue strength. In carbide disequilibrium, bearing accessories easily quenching cooling carbide, uneven phenomenon can lead to bearing joints of life more and more low bearing material standards, a variety of specifications of steel materials are special invited decision clear.
7, special strict surface. "And called layer
Should the ladder is the criterion for bearing material, the surface of the steel materials to reprimand is strict rules on the surface layer of the scope of the bench mark layer hot before machining process, the procuratorial organs, said: "if you don't solve in the process of producing held by quenching rest is bad, but the finished parts.
Arms and other requirements.
Ball bearing steel in the conversion cost bearing strong national method, oxygen and annealing hardness, fracture, the entrance is said to have finished the rest of the elements, spark prosecutors and supply status and display and so on have strict requirements.