Abstract: In the continuous casting of high titanium wire steel， TiN inclusions generated in liquid steel can easily induce the formation of "floater"， which leads to surface defects and even the steel leakage . In order to solve the above problems， the absorption of TiN inclusion by the mold slag for the casting of high titanium wire steel was studied by thermodynamic calculation， and methods of rotating column and high-temperature confocal. Thermodynamic calculation results show that SiO₂ and Al₂O₃ in CaO-SiO₂ slag can react with TiN， and SiO₂ has a stronger ability to react with TiN. The experiment of rotating column show that it can be seen that the dissolution ability of TiN column is limited， and the reaction occurs at the interface between TiN and mold slag. High temperature confocal experiment show that TiN is easily oxidized by air， and it also can be oxidized by mold slag according to the change of the total amount of samples before and after the reaction. Therefore， it is feasible to reduce occurance of floater through the oxidization of TiN by the oxidizing component in the mold slag.

Key words: High Ti Welding Wire Steel, Mold slag, Floater, Dissolution Experiments

摘要： 在高钛焊丝钢的连铸过程中，钢液中生成的TiN夹杂物容易诱发“结鱼”物的形成，从而引发连铸坯表面缺陷，甚至漏钢。针对以上问题，本文采用热力学计算、旋转柱法和高温共聚焦法实验对高钛焊丝钢连铸保护渣对TiN夹杂物的吸收进行了研究。热力学计算结果表明：CaO-SiO₂保护渣中的SiO₂和Al₂O₃均能与TiN发生反应，且SiO₂与其反应的能力更强；旋转柱实验表明：保护渣对柱状TiN的溶解能力有限，TiN和保护渣的界面处有反应发生；高温共聚焦实验表明：TiN很容易被空气所氧化，从反应前后试样总量的变化来看，TiN能够被保护渣所氧化。因此，采用保护渣氧化组分氧化TiN来减小结鱼有一定的可行性。

关键词: 高钛焊丝钢, 保护渣, 结鱼, 溶解实验