Home>Bearing knowledge>Study on the action of non-metallic inclusions in the process of bearing steel

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Discussion on the action of non-metallic inclusions in the process of bearing steel

Source: Bearing network time: 2013-01-30

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As an important metallurgical product; bearing steel is widely used in mechanical production, railway transportation, automobile production, national defense industry, etc. With the rapid development of science and technology; the demand for bearings is becoming more and more stringent; High lifespan, high stability and reliability; this requires the doping content of the bearing material to be reduced to a very low level. Because the impurities dissolved in the steel will damage the continuity of the matrix; affect the bearing performance.
Non-metallic inclusions are related to their composition; they are closely related to the process of exercise, pouring, etc. As long as the action and change of non-metallic inclusions in the process of exercise are clarified, the quality of bearing steel can be further improved.
The current production process of GCr15 bearing steel in an electric furnace steelmaking plant is: 100tEAF meltingâ†’LF heating stationâ†’VD vacuum treatmentâ†’150mmÃ—150mm billet continuous casting machine continuous casting.
The research found that: (1) The bearing steel impurities produced in this process are mainly Al2O3, sulfide and massive composite noodles containing calcium and magnesium, (2) in the amount of debris; slight reduction of point-like impurities after VD disposal Alumina and sulfide are greatly reduced; ferrochrome and silicate are noisy. Only a small amount of alumina, sulfide and compound doping rich in SiO2, Al2O3, CaO, S, etc. are found in the finished samples, (3) The scale of various impurities can be controlled below 10Î¼m. The 50% scale of the impurities in the LF sample is less than 10Î¼m; the scale of the impurities in the 90% after VD treatment is less than 10Î¼m; the scale of the impurities in the finished material is below 10Î¼m; and the majority is below 5Î¼m. (4) Alumina doping is mainly derived from aluminum deoxidation products and refractory materials; sulfides are nucleated mainly by oxides such as alumina; chemical reactions derived from S and sulfide constituents Ca, Fe, etc. in steel. The aluminate-based punctate non-deformed dopants are derived from deoxidized products; the calcium and magnesium in between are derived from the lining and slag.

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