Effect of microporous MgO refractories on steel cleanliness
YAN Xue-qiang,ZHENG Wan,WANG Guo-wei,YAN Wen,LI Guang-qiang
1.State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;2.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan 430081, Hubei, China
Abstract：Abstract： Interaction between three kinds of magnesiabased refractories (compact magnesia, microporous MgO, and magnesiacarbon) and ultralowcarbon steel (1560℃) was investigated by immersion experiments. The changes of O, N, C and Al, Si, Mn content and the composition, quantity and distribution of inclusions in steel at different immersion time (0-35min) were investigated, and observation and analysis of the interface layer between refractory and steel were carried out. The results show that with the extension of the immersion time, the oxygen content in the three kinds of steels first increases and then decreases, which causes some pollution to the molten steel, the number of inclusions in the steel increases, and the type of inclusions gradually changes from Al2O3-MnO to Al-Mg-Si-Mn-O composite inclusions. Compared with dense magnesium refractory materials, a continuous MgO spinel layer and a dense MgO layer can be formed at the interface between microporous MgO and magnesium carbon refractory materials and steel, which helps reduce the erosion of the refractory material and contamination of molten steel. In addition, compared with magnesiumfree refractory materials without carbon, magnesiumcarbon refractory materials have severe carbon addition to molten steel. Therefore, the microporous MgO refractory material not only has little secondary pollution to the molten steel and does not add carbon to the molten steel, but also can absorb alumina inclusions in the steel, which is more conducive to the production of ultralow carbon clean steel.
闫学强1,2，郑万1,2，王国伟1,2，鄢文1，李光强1,2. 微孔MgO耐火材料对钢液洁净度的影响[J]. 钢铁研究学报, 2020, 32(6): 483-490.
YAN Xue-qiang1,2,ZHENG Wan1,2,WANG Guo-wei1,2,YAN Wen1,LI Guang-qiang1,2. Effect of microporous MgO refractories on steel cleanliness. JOURNAL OF IRON AND STEEL RESEARCH , 2020, 32(6): 483-490.