The conclusions of the actual production of carbon bearing steel provides a theoretical basis.

Carbon bearing steel structural improvements and performance improvements
With China's equipment manufacturing industry to develop high-quality and high precision, for the manufacture of ball bearings, roller bearings and other steel sleeve is gaining attention. Along with the bearing industry sustained and rapid development, Bearing test machine steel market prospects. And, precision bearings and other basic mechanical casting industry has become a national "Twelve Five" period focus on the development of the industry. Therefore, it is necessary to intensify research on bearing steel, bearing steel to improve the quality.
Russian scholars GSVodovozova and PAZhdanov et al studied the carbon bearing steel structure and mechanical properties, and through experiments with ShKh15 class bearing steel were compared and analyzed in hardness, homogeneity and grain size The conclusions of the actual production of carbon bearing steel provides a theoretical basis.
Inhomogeneity into a "bottleneck"
In general, the performance requirements of bearing steel is a high hardness, good flexibility and fatigue resistance properties, especially anti-contact fatigue failure resistance. For carbon steel, when the carbon content of 0.95% to 1.15% of the meet these requirements; while the carbon content is 0.10% to 0.20% of the carbon bearing steel is often necessary for carbonitriding process to meet the above requirements. Bearing steel anti-contact fatigue failure of performance, depending on the non-metallic inclusions in steel coarse particles accumulate, the heterogeneity carbide crystal size differences and other factors. The combined effect of these defects causing the bearing steel in the course of micro-stress concentration and premature embrittlement (peel, cut formation and cracking, etc.).
Widely used class of bearing steel ShKh15 displayed obvious drawback is that the structure is not homogeneous due. It is through the chemical composition analysis of a feature, i.e. carbon content (0.95% to 1.10%), due to the heterogeneity of carbon and carbide segregation resulting development. In order to avoid this situation is not homogeneous occurrence or improvement of this situation, by increasing the length of time necessary for the homogenization annealing.
By adding suitable alloying elements can be achieved using low carbon content steel required hardness level. As we all know, as bearing steel, you can use low-carbon and medium carbon chromium - nickel, chromium - manganese and chromium - silicon - manganese steel. These steels are no carbon eutectoid steel main drawback --- carbides not homogeneous.
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