Zeyou Li, Jing Guo, Hanjie Guo, Jinan Jin, Chang Liu, Chunchun Lu, Yan Yan
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引用次数: 0
摘要
本研究旨在控制 ESR 中 45Cr9Si3 马氏体阀门钢中的大量 TiN 夹杂。为此，通过实验室规模的实验、热力学分析和工业测试，研究了 CaF2-Al2O3-CaO-SiO2- MgO-TiO2 型炉渣中不同 SiO2 含量对脱钛和钢中 TiN 夹杂的影响。结果表明，炉渣中的 SiO2 是一种良好的脱钛剂。炉渣中 SiO2 含量的增加降低了 TiO2 活性与 SiO2 活性之比，高 SiO2 含量（15.21 pct）可显著降低钢中的 Ti 含量，同时 Al 含量也相应降低，钢中的 O 含量变化不大，这使得 TiN 和 MgAl2O4 的数量和尺寸急剧下降。炉渣中 SiO2 的最佳含量为 15.0 pct，对去除钢中 Ti 和控制 Al、O 含量有良好效果。结合工业优化试验发现，在 ESR 中加入 20 pct 的 SiO2 进行冶炼，可将 TiN 的尺寸控制在 5 μm 以内，且 MgAl2O4 的含量大大降低。
Investigation of Ti Removal in 45Cr9Si3 Valve Steel by CaF2-Al2O3-CaO-SiO2-MgO-TiO2-Type ESR Slags with Different SiO2 Contents and Their Effects on TiN and Oxide Inclusions
The aim of this study was to control large TiN inclusions in 45Cr9Si3 martensitic valve steel in ESR. For this purpose, the effects of different SiO2 contents in CaF2-Al2O3-CaO-SiO2- MgO-TiO2-type slags on Ti removal and TiN inclusions in steel have been investigated through laboratory-scale experiments, thermodynamic analysis, and industrial tests. The results showed that SiO2 in slag is a good de-Ti agent. The increase of SiO2 content in slag reduces the ratio of TiO2 activity to SiO2 activity, a high SiO2 content (15.21 pct) can significantly reduce the Ti content in steel, and at the same time, the Al content also decreases correspondingly, and the O content in steel changes little, which makes the number and size of TiN and MgAl2O4 decrease sharply. The optimum content of SiO2 in slag is 15.0 pct, which has good effect of removing Ti from steel and controlling Al and O contents. Combined with industrial optimization test, it is found that smelting with 20 pct SiO2 in ESR can control the size of TiN within 5 μm, and the amount of MgAl2O4 is greatly reduced.
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