Abstract:In order to expand the application of magnesium treatment in the Si-Mn killed steel production, the effect of the amount and the order of addition magnesium on the formation and the evolution of inclusion were investigated by the combination of high temperature experiments and thermodynamic calculations. The results showed that the stability diagram of the Mg-Si-Mn-O molten steel at 1 600 ℃ was composed of MgO-SiO2-MnO(l), 2MgO·SiO2(s) and the MgO(s). The deoxidization product of the SiO2-MnO(l) was modified to MgO-SiO2-MnO(l) when the addition amount of magnesium was 0.000 5%. When the addition amount of the magnesium increased to 0.001 9%, MgO(s) phase formed.The formation path of inclusions varied with different orders of addition magnesium. When magnesium was added following the silicon addition, the formation path was SiO2-MnO(l)→MgO-SiO2-MnO(l). While the evolution path was MgO(s)→MgO-SiO2(s)→MgO-SiO2-MnO(l) when magnesium was added before addition silicon.
张庆松, 闵 义, 许海生, 许久健, 刘承军. 硅镇静钢镁处理后夹杂物的生成及演变行为[J]. 钢铁, 2019, 54(4): 37-42.
ZHANG Qing-song, MIN Yi, XU Hai-sheng, XU Jiu-jian, LIU Cheng-jun. Effect of magnesium treatment on formation and evolution of inclusion in Si-Mn deoxidized steel. Iron and Steel, 2019, 54(4): 37-42.