Zeng Qiang, Li Jianli, Xu Qi, Yu Yue
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China.
Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan, 430081, China.
Heliyon. 2022 Nov 23;8(11):e11800. doi: 10.1016/j.heliyon.2022.e11800. eCollection 2022 Nov.
Increasingly MgO content in refining slag and molten steel is the major cause of corrosion of refractory materials at slag line during the refining process of Si-Mn deoxidized tire cord steel, the effects on the crystallization behavior of typical MnO-SiO-AlO based inclusions in tire cord steel were studied. The relation between the formation of high melting point and high hardness inclusions (AlO, 3AlO·2SiO, MgO·AlO and 2MgO·SiO) with MnO-SiO-AlO-(0wt.%, 4wt.%, 8wt.%, 12wt.%, 16wt.%) MgO system was verified by ICP, XRD, SEM-EDS and FactSage 8.0. The results indicated that the crystallization temperature of MnO-SiO-AlO system increases with the increase of MgO content. Mg MnSiO(1 ≤ < 2) solid solution is the main crystalline phase due to isomorphism. Only a small amount of 2MgO·SiO which is not enough to cause wire breakage was formed in the trial with the highest MgO content (16wt.%) after the low melting point MnO-SiO-AlO composition added different MgO content and the other three kinds of inclusions were not produced in the five trials.
在硅锰脱氧帘线钢精炼过程中，精炼渣和钢水中MgO含量的增加是渣线耐火材料腐蚀的主要原因，研究了其对帘线钢中典型MnO-SiO-AlO基夹杂物结晶行为的影响。通过ICP、XRD、SEM-EDS和FactSage 8.0验证了MnO-SiO-AlO-(0wt.%, 4wt.%, 8wt.%, 12wt.%, 16wt.%)MgO体系中高熔点和高硬度夹杂物（AlO、3AlO·2SiO、MgO·AlO和2MgO·SiO）的形成关系。结果表明，MnO-SiO-AlO体系的结晶温度随MgO含量的增加而升高。由于同构作用，Mg MnSiO(1 ≤ < 2)固溶体是主要的结晶相。在低熔点MnO-SiO-AlO成分添加不同MgO含量的五次试验中，MgO含量最高（16wt.%）的试验仅形成了少量不足以导致断线的2MgO·SiO，其他三种夹杂物均未产生。
