Medium- and high-Mn steels have excellent properties but are very difficult to be commercially produced because of the high content of some alloy elements. To enhance the understanding of the reaction between medium/high-Mn steel and refining slag which is significantly different from the conventional steels, steel and slag composition and the inclusions were investigated by equilibrium reaction between Fe-xMn (x = 5, 10, 15, and 20 mass pct) and CaO-SiO₂-Al₂O₃-MgO top slag at 1873 K in the laboratory. Furthermore, the effect of Mn content on inclusion transformation and steel cleanliness was also explored. After slag–steel reaction, both contents of MnO in slag and Si in steel increased. Most MnO inclusions in master steel transformed to MnO-SiO₂ and MnO-Al₂O₃-MgO. With the increase in Mn content, the amount share of MnO type inclusions decreased and that of MnO-Al₂O₃-MgO type increased. In addition, both the number density of observed inclusions and the calculated oxygen content in inclusions increased. Thermodynamic analysis indicates that the composition change of steel and slag and the transformation of inclusions are mainly the consequence of the reaction between Mn in molten steel and SiO₂ and MgO in top slag. The dissolved Mn in medium/high-Mn steel presents a strong reactivity.

中文翻译：

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Mn 含量对 Fe-xMn（x = 5、10、15 和 20 质量 Pct）钢与 CaO-SiO2-Al2O3-MgO 渣反应的影响

中高锰钢具有优良的性能，但由于某些合金元素含量高，很难实现商业化生产。为了加深对中/高锰钢与与常规钢显着不同的精炼渣反应的理解，通过 Fe-xMn (x = 5, 10, 15和 20 质量 pct) 和 CaO-SiO ₂ -Al ₂ O ₃ -MgO 顶渣在 1873 K 实验室。此外，还探讨了 Mn 含量对夹杂物转变和钢清洁度的影响。渣-钢反应后，渣中MnO和钢中Si的含量均增加。母钢中大部分 MnO 夹杂物转化为 MnO-SiO₂和 MnO-Al ₂ O ₃ -MgO。随着Mn含量的增加，MnO型夹杂物所占的份额减少，MnO-Al ₂ O ₃ -MgO型夹杂物的份额增加。此外，观察到的夹杂物的数量密度和计算的夹杂物氧含量均增加。热力学分析表明，钢和渣的成分变化和夹杂物的转变主要是钢液中的Mn与顶渣中的SiO ₂和MgO反应的结果。中/高锰钢中溶解的锰表现出很强的反应性。