Research On The Interfacial Reaction Behavior Of High Manganese And High Aluminum Steel With Filler Sand

Researchers at domestic and international have conducted a large number of studies on the factors affecting the opening of ladles of common steel liquids,among which the effect of the reaction of the steel liquid with the filler sand filled in the sliding nozzle on the self-opening of the ladle has attracted the attention of most scholars.In recent years,as research has progressed,high manganese and high aluminum steel has been used in many important applications with its excellent properties,but ladle opening of high manganese and high aluminum steel is particularly difficult due to the specificity of its alloying elements.However,current research on high manganese and high aluminum steel has focused on the interaction of high manganese and high aluminum steel with refractory materials and slag,as well as the organizational and mechanical properties of high manganese and high aluminum steel,while there is a lack of research in areas such as self-opening of high manganese and high alumina steel ladles and improving the cleanliness of high manganese and high aluminum steel.In order to investigate the reaction behavior of high manganese and high aluminum steel with the filler sand,the influence of the elements in the steel and the type of oxides in the filler sand on the reaction behavior of the steel-sand,and the type of inclusions in the steel after the reaction,this thesis is carried out by means of laboratory tests and thermodynamic calculations.The main research and conclusions of this thesis are as follows:（1）Laboratory tests were used to investigate the reaction behavior of high manganese and high aluminum steel with chromium-containing filler sand.The results show that the reaction between the high manganese high aluminum steel and the filler sand results in the formation of a liquid phase consisting of Mn O-Si O₂-Al₂O₃-Fe O-Mg O,in which Mn O,Si O₂and Al₂O₃account for a large proportion,and Cr-containing Mg O-Al₂O₃spinel is also formed.（2）Laboratory tests and thermodynamic calculations were used to investigate the effect of the elements in the steel solution on the reaction behavior of the steel-sand.The results show that the Fe,Mn and Al elements in the molten steel can erode the quartz phase of the filler sand,while only the Al element can react with the Cr₂O₃in the chromite phase of the induced sand to form the liquid phase Al₂O₃.（3）Laboratory tests and thermodynamic calculations were used to investigate the effect of the type of oxide in the induced sand on the reaction behavior of the steel-sand.The results of the study show that Si O₂in the sand can enlarge the liquid phase zone and promote the generation of low-temperature liquid phase zone,so it is recommended to control the Si O₂content in the sand to 20%for smelting high-alloy steel grades.Cr₂O₃and Zr O₂in filler sand can reduce the liquid phase zone and inhibit the generation of low-temperature liquid phase zone.Al₂O₃in draining sands can inhibit the formation of the low temperature liquid phase zone,but at the same time it can expand the high temperature liquid phase zone.（4）Laboratory tests were used to investigate the types of inclusions in the high manganese high aluminum steel after reaction with the filler sand.The results show that the inclusions in the high manganese and high aluminum steel after reaction with the filler sand are mainly aluminum inclusions,aluminum silicate inclusions,spinel inclusions and large aluminum oxide inclusions.The Al reduction in high manganese and high aluminum is strong and can react with other reaction products of the steel sand to produce Al₂O₃,resulting in a large number of aluminum oxide inclusions in the steel.In addition,different types of inclusions in high manganese high aluminum steel with different Mn contents,only the high manganese and high aluminum steel with 30%Mn content has aluminum silicate inclusions and spinel inclusions.