Abstract
A new equilibrium calculation model for the slag composition design of bearing steel is established through the combination between IMCT and FactSage software. With this model, the equilibrium slag could be obtained quantitatively when the initial compositions of steel were given. It is validated by the comparison of predictive results with experimental data with different slag system, reflecting the reliability of the model. After that, the effects of Al in steel as well as CaO, MgO and Al2O3 in slag on the dissolved oxygen, magnesium and calcium were discussed in detail. Furthermore, Industrial trials with five different slags was carried out in a special steel plant in China. Results show a good correlation between the calculated contents in molten steel after LF refining and number density of oxide inclusions in final steel, which means this model have a good guidance for the production of high clean bearing steel.
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