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系统分析和研究了采用“EAF→LF→VD→CC”工艺流程生产试验钢时,各工序的全氧与氮含量的变化情况、钢液中非金属夹杂物的生成与变化以及精炼初渣对夹杂物去除的影响。结果表明:试验钢在LF精炼过程中w(T.O)平均下降42.83%,经VD真空处理后w(T.O)和w(N)平均下降48.77%和10.72%。在LF精炼过程中,钢液中非金属夹杂物按“Al2O3系夹杂物→MgO-Al2O3系夹杂物→CaO-MgO-Al2O3系夹杂物”顺序转变,其中MgO-Al2O3系夹杂物向CaO-MgO-Al2O3系夹杂物转变是由外向内逐步进行,并且夹杂物中CaO与MgO互不相溶。精炼初渣碱度控制在2.5左右对于炉渣吸收夹杂较为有利。
The change of total oxygen and nitrogen content in each process, the formation and change of nonmetallic inclusions in molten steel and the initial refining process were systematically analyzed and researched when the test steel was produced by the process of “EAF → LF → VD → CC” Effect of slag on inclusion removal. The results show that w (T.O) decreases by 42.83% on average during LF refining, and w (T.O) and w (N) decrease by 48.77% and 10.72% on average after VD vacuum treatment. In the process of LF refining, the non-metallic inclusions in the molten steel are sequentially changed according to “Al2O3 series inclusions → MgO-Al2O3 series inclusions → CaO-MgO-Al2O3 series inclusions”, and the MgO-Al2O3 series inclusions are sequentially transformed into CaO The transformation of MgO-Al2O3-based inclusions is progressively carried from the outside to the inside, and the inclusions CaO and MgO are incompatible with each other. Alkali refining initial slag control around 2.5 slag absorption inclusion is more favorable.