Análise qualitativa da descarburação do MRPL da ArcelorMittal Inox Brasil através do teor de oxigênio do gás da exaustão

Abstract

The oxygen content in MRPL exhausted gas was observed in SAE1012 and SAE1016 produced in ArcelorMittal Inox Brasil. The aims were to make qualitative relation between point carbon content and exhausted gas oxygen content, and identify the influence of inert gas flow on the gas exhausted oxygen content. In the first step the carbon content was correlated with end point oxygen content. The process data was comparing to the equilibrium thermodynamically established. It was adjusted to 6 point polynomial with data process in order to know the oxygen exhausted trend. After this, it was cal culated the first derived to determine the minimum and maximum points. So the argon flow was modified for mathematical model in conditions 0, 6Nm3/min and12,5Nm3/min. The aim was establishing correlation between the agitation and the gas oxygen content. The result shows that when the point carbon content is low the oxygen content is high. The increase agitation means the decrease oxygen content in bath.The mathematical model changed the inert gas flow in 80% of the process. But the critical carbon content is reached above 70% of the process. So the actual process is not corresponding to MRPL optimized process. There are consistency between bibliographic references and the data of the work. It is possible to preview qualitatively decarburizing rate by studying the gas exhausted oxygen content.