Analysis of oxidation of the final metal in the smelting of steel in supersize converters

This work shows the experience of using of sensor ? oxygen activity control Celox, complete with modern registering device Multi-Lab Celox in conditions of 350-ton converters of Azovstal Iron and Steel Works. According to the current production of tube steel X70 balance of oxygen between metal and slag in the end of refining is studied. It is shown that a considerable spread of data on oxygen activity due to insufficient quality measurements, as well as the influence of the slag. As have shown results of the analysis, depending on the carbon content in the metal and the composition of the slag oxygen activity at the end of refining varies widely (0,033-0,116 %) and an average is 0.072 %. When the carbon content in the metal more than 0,05 % a significant effect on the activity of oxygen has the reaction of oxidation of carbon. Deviation of the actual values of oxygen activity in equilibrium with carbon rather and is about 0.02 %. When the carbon content is less than 0,04 % the dominant influence on the activity of oxygen in the metal has the oxidation potential of the slag. Specifically, all actions directed at its reduction, will make positive impact on the consumption of deoxidizers