Study on Ds-type large particle inclusions in bearing steel

Bearings are important mechanical foundations and are used in a wide range of mechanical and engineering applications. It largely determines the accuracy, performance, longevity and reliability of the equipment and plays an extremely important role in the national economy. The control of inclusions in bearing steel has always been the focus of the development of bearing steel. The control of large spherical spherical inclusions in bearing steel, namely Ds (≥13μm), is the most important control of bearing steel inclusions. Balls of different diameters The relationship between bearing fatigue life and Ds inclusion size is shown in Figure 1. It can be seen that the larger the Ds inclusion size, the lower the fatigue life, and the Ds inclusion rating is also determined according to its size.

The scholars of Baoshan Iron and Steel Co., Ltd. studied the influence of the slag of the bearing steel VD process on the formation of total oxygen and Ds inclusions through the vacuum induction furnace test. The ideal slag system is the medium alkalinity slag system, and its w( CaO) / w (SiO2) = 3 ~ 4, w (CaO) / w (Al2O3) = 1.6 ~ 1.8, can be smelted w (TO) <10 × 10-6 and Ds inclusion control of the bearing steel; The analysis of the evolution of inclusions in the LF-VD process smelting bearing steel found that the Ds inclusions increased after the VD vacuum was completed. The steel slag was mixed thoroughly during the VD treatment, and the reaction was severe, which led to the increase of calcium in the molten steel, which led to the increase of the inclusion calcium content. The calcium inclusions are increased; the Ds inclusions in the final product are mainly the following three types: the endogenous Ds inclusions containing no silicon in the center, the enveloping inclusion Ds inclusions surrounded by MgO, and the refining slag inclusion type containing silicon in the center. Ds is mixed. Combined with the experimental research and the observation results of Ds inclusion, the Ds inclusion can be controlled from the aspects of controlling the slag system, reducing the covering agent slag and reducing the refining slag.

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