Reactions among alloying elements in manganese steel and CO2 decomposed from the limestone in MgO-CaO refractories at high temperatures were studied via medium frequency induction furnace. The steel sample was placed in an unfired MgO-CaO refractory crucible added by 20 mass% limestone, and melted in Ar atmosphere in a medium frequency induction furnace. After the steel sample was melted,steel slag was put into the crucible and then continuously melted at 1 600 ℃. The steel samples were taken out at regular intervals with quartz tube during the experiment,and then the molten steei was poured out from the crucible. The alloying elements content and total oxygen content of steel samples were determined and the crucible after experiment was studied by XRD and chemical analysis. Influence of MgO refractories without limestone on alloying elements and total oxygen content of molten steel was also investigated for comparison. The result shows that CO2 decomposed from limestone in the MgO-CaO refractories at high temperatures can react with the alloying elements,resulting in the decrease of alloying elements content and the increase of total oxygen content.%利用中频感应炉研究了高温下镁钙质耐火材料中石灰石分解生成的CO2与锰合金钢中合金元素之间的反应.将钢样置于加入20％(w)石灰石制成的不烧镁钙质坩埚内,在中频感应炉中氩气气氛下熔炼.待钢样熔化后加入钢渣,然后将温度保持在1600℃继续熔炼,每间隔一段时间用石英管从钢水中取钢样,然后将钢水从坩埚内倒出.对所取钢样进行合金元素和总氧含量分析,对熔炼后坩埚进行XRD分析及化学分析,同时对比了不含石灰石的镁质材料对钢水相关元素和总氧含量的影响.结果表明,高温下镁钙质耐火材料中的石灰石分解产生的CO2会与锰合金钢中合金元素发生反应,降低钢中合金元素的含量,增加钢中的总氧含量.
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