钢包渣改质对Mn在渣钢间分配和钢中夹杂物的影响-钢铁冶金专业论文.docxVIP

万方数据 万方数据 （3）当渣中 Al2O3 含量增加时，钢中夹杂物的平均粒径先减少后增加，在 Al2O3 含量为 20%左右时，达到最小值。渣中 Al2O3 含量对钢中夹杂物的数量也 有类似影响，在 Al2O3 含量为 20%左右时，钢中夹杂物数量最少。 关键词：钢包渣；改质；锰；分配比；夹杂物 II Abstract The distribution equilibrium of Mn between ladle slag and liquid steel during the refining of ultra low carbon Al-Si killed steel was simulated in a LaCrO3 high temperature furnace at 1873 K, the influencing factors on the distribution of Mn between ladle top slag and liquid steel was investigated. It is concluded that : The FetO content in slag has a significant effect on the distribution of Mn between ladle slag and liquid steel, which increases with the increasing of FetO content in the range of 0~ 20%. When the basicity increases in the range of 0.5~5, the distribution ratio decreases to the minimum and then increases. With increasing the Al2O3 content in slag, the distribution ratio decreases to the minimum value and then increases. In order to obtain high yield of Mn alloy, FetO content should be below 5%, Al2O3 content is between 20% and 25%, and the CaO/SiO2 value is about 2.5. The distribution ratio of Mn decreases after reforming. In all of the four modifiers(CaC2+Al2O3, Al+CaC2, Al+CaCO3, Al+CaO), the effect of (Al+CaO) is the best and the distribution obtained is the lowest. Cs of all slags have been calculated, it shows that slag 6#(46.11%CaO-21.52%SiO2-20.98%Al2O3-0.32%FetO-1.40%MnO-9.67%MgO), 9#(43.64%CaO-18.92%SiO2-24.78%Al2O3-0.11%FetO-0.28%MnO-12.27%MgO) and11#(43.47%CaO-16.97%SiO2-25.79%Al2O3-0.03%FetO-1.38%MnO-12.36%Mg have higher Cs, which is good for desulfurization during steelmaking. In addition, inclusions statistical analysis after reforming has been carried out based on the above research. The effect of slag composition on the type, size and amount of inclusion in steel is also studied, it shows that: According to different types, inclusions in steel after reforming can be roughly divided into two types: one kind is MnO and MnS complex inclusions, mixed with a small amount of S