Ti-IF钢浸入式水口堵塞机理研究

Study on Plugging Mechanism of Ti-IF Steel Submerged Nozzle

摘要: 研究了Ti-IF浸入式水口堵塞的结构组成和形成机理。堵塞物从外层向基底从疏松到致密，成分主要为复合氧化物和Al₂O₃夹杂物。由于浇注过程中的氧化反应以及钢液中氧化物与中间包工作层耐材的反应一直存在，使得铝、钛氧化物以及以其为基础的复合氧化物不断生成并在浸入式水口底部沉积，最终形成了堵塞，通过优化钢液成分、强化保护浇注等措施，缓解了水口堵塞问题，稳定连浇炉数从6~8炉提高到10~12炉，效果显著。

Abstract: The structural composition and formation mechanism of Ti-IF steel submerged nozzle plugging were studied. The plug is loose to dense from the outer layer to the base, which main components are composite oxides and Al₂O₃ inclusions. Due to the oxidation reaction in the pouring process and the reaction between the oxide in the molten steel and the refractory of the tundish working layer, aluminum and titanium oxides and their based composite oxides are constantly generated and deposited at the bottom of the submerged nozzle, eventually forming a blockage. By optimizing the composition of molten steel and strengthening protective pouring, the problem of nozzle blockage was alleviated, and the number of stable continuous pouring furnaces was increased from 6~8 furnaces to 10~12 furnaces, with remarkable effect.