Title

EVALUATION OF PHOSPHORUS PARTITION IN STEELS USING COMPUTATIONAL THERMODYNAMIC AND COMPARISON WITH LITERATURE DATA

EVALUATION OF PHOSPHORUS PARTITION IN STEELS USING COMPUTATIONAL THERMODYNAMIC AND COMPARISON WITH LITERATURE DATA

Authorship

Almeida, Rodolfo Arnaldo Montecinos de; Bielefeldt, Wagner Viana; Vilela, Antônio Cezar Faria

Almeida, Rodolfo Arnaldo Montecinos de

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Bielefeldt, Wagner Viana

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Vilela, Antônio Cezar Faria

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DOI

10.5151/1982-9345-31590

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Abstract

Phosphorus content control at steel plants is frequently a challenge. This element, in general, is undesirable for steel, due to its deleterious effect in steel properties. Phosphorus partition (Lp=%P(slag)/%P(steel)) is widely used to analyze the dephosphorization efficiency. The thermodynamic program FactSage is largely used in the analysis of steelmaking slags. This study aims not only to evaluate the accuracy of the program FactSage v. 7.2, but also the contribution of the thermodynamics in the dephosphorization phenomena. A study about how the phosphorus partition behaves in the program calculations was done. This study is divided in two parts: the first part is an analysis of the effects that the different slag oxides, basicity, FeO and Al2O3, have in the Lp; the second part is a comparison between the literature values of phosphorus distribution and the results found by the program calculation. As the program considers that the system is in thermodynamic equilibrium, all the literature chosen was considered in equilibrium by its authors. For the first part it was found that the results behaved as expected by the literature, in the second part, the comparison resulted in average/good determination coefficient, R2 above 0.6, for literature data.

Phosphorus content control at steel plants is frequently a challenge. This element, in general, is undesirable for steel, due to its deleterious effect in steel properties. Phosphorus partition (Lp=%P(slag)/%P(steel)) is widely used to analyze the dephosphorization efficiency. The thermodynamic program FactSage is largely used in the analysis of steelmaking slags. This study aims not only to evaluate the accuracy of the program FactSage v. 7.2, but also the contribution of the thermodynamics in the dephosphorization phenomena. A study about how the phosphorus partition behaves in the program calculations was done. This study is divided in two parts: the first part is an analysis of the effects that the different slag oxides, basicity, FeO and Al2O3, have in the Lp; the second part is a comparison between the literature values of phosphorus distribution and the results found by the program calculation. As the program considers that the system is in thermodynamic equilibrium, all the literature chosen was considered in equilibrium by its authors. For the first part it was found that the results behaved as expected by the literature, in the second part, the comparison resulted in average/good determination coefficient, R2 above 0.6, for literature data.

Keywords

Dephosphorization; Phosphorus partition; Steelmaking slags

Dephosphorization; Phosphorus partition; Steelmaking slags