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    Thermodynamic Calculations Versus Instrumental Analysis of Slag-Steel Equilibria in an ASEA–SKF Ladle Furnace

    Published: 17 September 2014

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    This research sets out to study the possibility and reliability of applying commercially available computational thermodynamic software to calculate comparable data to the instrumentally analyzed amounts of the elements in the molten steel and minerals in the tops slag during the clean steelmaking process. Vacuum treatment process in an ASEA–SKF ladle furnace was chosen for this study. The Thermo-Calc software package was applied in order to compute slag-steel equilibria conditions at the end of the argon degassing process. The slag, steel, temperature, and pressure that were measured by instrumental analysis at the steelmaking plant and were taken exactly before starting the argon degassing process was used as the input data for these thermodynamic calculations, and the simulated results of the Thermo-Calc were compared with the measured values of steel and slag compositions at the end of the degassing process. Regarding Al2O3, CaO, S, and SiO2 in the top slag and Al, Mn, and Si in molten steels, the measured results were in good agreement with the calculated results. Considering the calculated MgO content of the top slag and O, S, Ca, and Mg contents in the molten steel, the calculated results disagreed with the measured ones. Finally, a model was suggested that could be applied to calculate the closest results to the measured results of oxygen content in the molten steel. This study also highlighted the possibility of applying computational thermodynamics for predicting the appearance of dominant types of inclusions during steelmaking and solidifications.


    top slag, bearing steel, equilibrium, thermo-calc, computational thermodynamics

    Author Information:

    Riyahi Malayeri, Kamrooz
    Group Manufacturing Development Centre, AB SKF, Gothenburg,

    Ölund, Patrik
    Materials Research and Development, Ovako Hofors AB, Hofors,

    Sjöblom, Ulf
    Group Manufacturing Development Centre, AB SKF, Gothenburg,

    Committee/Subcommittee: A01.28

    DOI: 10.1520/STP158020140025