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
Zeyou Li, Jing Guo, Hanjie Guo, Jinan Jin, Chang Liu, Chunchun Lu, Yan Yan
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Abstract
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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