Research On The Reaction Behavior Of High Manganese And High Aluminum Steel With Ladle Refractory

The interactions between common Al-killed steel and ladle refractory and ladle glaze have been studied extensively and intensively by domestic and international researchers,with significant results,contributing to the cleanliness and quality of common Al-killed steel.As the performance and quality requirements of steel products in other fields continue to rise,high manganese and high aluminum steels have attracted the attention of metallurgists due to their excellent mechanical properties.High aluminum steels have more complex thermodynamic properties of solute elements due to their higher content of[Mn]and[Al]elements than ordinary Al-killed steel,and therefore their interaction with ladle refractories and ladle glazes is significantly different from that of Al-killed steel.Therefore,this thesis investigates the reaction mechanism between high manganese and high aluminum steel,refractory and ladle glaze by means of laboratory experiments and thermodynamic calculations.The main research elements and conclusions of the text are as follows:（1）The reaction mechanisms between high manganese and high aluminum steel and MgO refractories at different[Mn]and[Al]contents are investigated by laboratory experiments.The results show that the erosion of the MgO refractory deepens with increasing[Mn]and[Al]content and that the erosion occurs because the[Mn]and[Al]elements in the steel react with the MgO in the refractory.Firstly,[Al]in the steel reacts with MgO in preference to MgO·Al₂O₃due to its thermodynamic properties,then[Mn]in the steel reacts with the MgO·Al₂O₃to form（Mn,Mg）O·Al₂O₃as the reaction progresses.When a certain amount of Mn O in（Mn,Mg）O·Al₂O₃is reached,it diffuses into the refractory and reacts with MgO to form a（Mn,Mg）O solid solution.（2）The reaction mechanism between high manganese and high aluminum steel and MgO refractory covered with a glaze layer is investigated using laboratory experiments.The glazed MgO refractory is obtained by inserting the MgO refractory into the slag for a period of time and then removing it,after which it is reacted with the high manganese and high aluminum steel.The results show that the Si O₂in the glaze layer reacts with the[Mn]and[Al]in the steel to form Mn O and Al₂O₃,then the MgO in the glaze layer is reduced by the[Al]in the steel and the[Mg]in the steel reacts with the Al₂O₃in the glaze layer to form Mg Al O₄,and as more and more[Mn]in the steel diffuses into the reaction layer to react with the Mg Al O₄already formed to form（Mn,Mg）O·Al₂O₃spinel.The[Al]in the steel then also reduces the Ca O in the glaze layer to[Ca],which then reacts with the Al₂O₃to form calcium aluminate.When there is a certain amount of Mn O in the glaze layer,it diffuses into the MgO refractory to form a（Mn,Mg）O solid solution with MgO.（3）The presence of ladle glaze prevents the reaction between the steel and the refractory,and the greater the alkalinity of the ladle glaze,the stronger the obstructive effect.