Valoración de datos termoquímicos en la desoxidación del acero

P. Gómez; F. Reyes; J. Gutiérrez; G. Plascencia

doi:10.3989/revmetalm.0847

Authors

P. Gómez Facultad de Química - UNAM, Dpto. de Ing. Quim. Metalúrgica
F. Reyes Facultad de Química - UNAM, Dpto. de Ing. Quim. Metalúrgica
J. Gutiérrez ESIME-Azcapotzalco
G. Plascencia CIITEC - IPN

DOI:

https://doi.org/10.3989/revmetalm.0847

Keywords:

Molten steel, Deoxidation, Deoxidizing agents, Dilute Solutions, Chemical equilibrium

Abstract

It is proposed to develop a method to judge the certainty on the information regarding to deoxidation equilibria of iron melts. To accomplish this objective, thermochemical data was collated and then evaluated. The basic knowledge on deoxidation conditions are framed by the non-ideal Henrian behaviour of diluted solutions of both deoxidizer and oxygen in liquid iron in equilibrium with a pure oxide. Conventional deoxidation reactions were considered at 1,873 K such that in their equilibrium constants, only first order interaction coefficients were considered. The criteria in selecting the most appropriated free energy equation was based on evaluating them under two critical composition points: 1 where they satisfy an oxygen to deoxidizer ratio dictated by its stoichiometry and 2 where oxygen contents at a given amount of deoxidizer reaches a minimum value. These data were plotted on logarithmic scales to appreciate the effects of deoxidizer’s valences. Once such information was classified, under restrictions 1 and 2, previous compositions were related to deoxidizer´s electronegativities.

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