Wu Chenhui, Peng Youquan, Zhang Jiqing, Zhang Jianhua, Xie Xin
Automobile & Household Appliances Steels Division, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, China.
Pangang Group Xichang Steel Vanadium Co., Ltd., Xichang 615032, China.
Materials (Basel). 2025 Aug 22;18(17):3945. doi: 10.3390/ma18173945.
Stuffing sand, as a critical auxiliary material, plays an important role in ladle teeming during the continuous casting process and is closely related to steel cleanliness. Based on thermodynamic calculations, a melting test in a vacuum induction furnace, and industrial statistical data analysis, the reoxidation of IF steel caused by conventional CrO-based stuffing sand was investigated. The results show that CrO-based stuffing sand is one of the main factors resulting in the reoxidation of IF steel. [Al] and [Ti] in IF steel can be oxidized by FeO, CrO, and SiO from the CrO-based stuffing sand, which leads to the mass burning loss of [Al] and [Ti], thus resulting in the deterioration of steel cleanliness. After reoxidation caused by CrO-based stuffing sand, the [Cr] content in IF steel increases by 70 ppm on average. To avoid reoxidation pollution by conventional CrO-based stuffing sand, a new kind of AlO-based stuffing sand with low reactivity was developed and applied in industrial production. After adopting this new kind of stuffing sand, the burning loss of [Al] and [Ti] decreases by 41.3% and 24.2%, respectively, and the total oxygen content (T.[O]) of the steel in the tundish decreases by 35.2% compared with the conventional CrO-based stuffing sand.
引流砂作为一种关键辅助材料，在连铸过程的钢包浇注中起着重要作用，且与钢的洁净度密切相关。基于热力学计算、真空感应炉熔炼试验以及工业统计数据分析，研究了传统CrO基引流砂对IF钢的再氧化作用。结果表明，CrO基引流砂是导致IF钢再氧化的主要因素之一。IF钢中的[Al]和[Ti]会被CrO基引流砂中的FeO、CrO和SiO氧化，导致[Al]和[Ti]大量烧损，从而使钢的洁净度恶化。CrO基引流砂导致再氧化后，IF钢中的[Cr]含量平均增加70 ppm。为避免传统CrO基引流砂造成的再氧化污染，开发了一种低反应活性的新型AlO基引流砂并应用于工业生产。采用这种新型引流砂后，[Al]和[Ti]的烧损率分别降低了41.3%和24.2%，与传统CrO基引流砂相比，中间包钢水的总氧含量（T.[O]）降低了35.2%。
