含钛铁素体不锈钢连铸浸入式水口结瘤机理研究

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Study on Clogging Mechanism of Submerged Entry Nozzle for Continuous Casting of Ferritic Stainless Steel Containing Ti

1. School of Metallurgical and Ecological Engineering, Beijing University of Science and Technology, Beijing 100083, China;
2. Technology Center of Stainless Steel, Baosteel Research Institute, Shanghai 200431, China

摘要: 采用光学显微镜和扫描电镜，对00Cr18Ti铁素体不锈钢钢样中夹杂物类型和浸入式水口结瘤物的物相进行分析，研究水口结瘤机理。结果表明，钢液中存在大量TiO₂夹杂物，并不断附着沉积在水口内壁，造成浸入式水口氧化钛型结瘤；通过控制钢中w_[Al]-w_[Ti]值在铝钛竞争氧化反应平衡曲线之下，使w_[Ti]/w_[Al]^4/3<273.55，能够防止大量TiO₂夹杂物的生成，避免氧化钛型水口结瘤。
- 不锈钢 /
- 夹杂物 /
- 浸入式水口 /
- 结瘤 /
- 氧化钛
Abstract: The types of inclusions and the phases of clogging of submerged entry nozzle in 00Cr18Ti stainless steel were investigated by optical microscope and scanning electron microscope(SEM), and meanwhile the mechanism of nozzle clogging was studied.The results showed that a lot of titania inclusions existed in molten steel, and some of them adhered and precipitated to the interface of nozzle, which led to clogging.The formation of mass titania inclusions was depressed, and the phenomenon of titania clogging of submerged entry nozzle was avoided by controlling the contents of w_[Al]-w_[Ti] below the equilibrium curve of competitive oxidation reaction between [Al] and [Ti], that is w_[Ti]/w_[Al]^4/3 less than 273.55.
- stainless steel /
- inclusion /
- submerged entry nozzle /
- clogging /
- titania