Absorption behavior of TiO<sub>2</sub> inclusions by different high titanium steel mold slags

DAI Mingjie; CHEN Shoujie; WANG Xueyou; ZHANG Xubin; HE Shengping; WANG Qiangqiang

doi:10.7513/j.issn.1004-7638.2025.06.014

Volume 46 Issue 6

Dec. 2025

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DAI Mingjie, CHEN Shoujie, WANG Xueyou, ZHANG Xubin, HE Shengping, WANG Qiangqiang. Absorption behavior of TiO2 inclusions by different high titanium steel mold slags[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(6): 117-123. doi: 10.7513/j.issn.1004-7638.2025.06.014

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DAI Mingjie, CHEN Shoujie, WANG Xueyou, ZHANG Xubin, HE Shengping, WANG Qiangqiang. Absorption behavior of TiO₂ inclusions by different high titanium steel mold slags[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(6): 117-123. doi: 10.7513/j.issn.1004-7638.2025.06.014

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Absorption behavior of TiO₂ inclusions by different high titanium steel mold slags

doi: 10.7513/j.issn.1004-7638.2025.06.014

1.
College of Materials Science and Engineering, Chongqing University, Chongqing 400044 , China
2.
Technical Center, Henan Tongyu Metallurgy Materials Group Co., Ltd., Nanyang 474500, Henan, China

More Information

Received Date: 2025-02-12
Accepted Date: 2025-03-26
Rev Recd Date: 2025-03-20

Available Online: 2025-12-31

Publish Date: 2025-12-31

Abstract

Abstract

To enhance the inclusion absorption rate of mold slags during continuous casting of high-titanium steel, five candidate high-Ti steel slags were designed. The absorption behaviors and absorption rate differences of TiO₂ inclusions by each slag were investigated through a combination of in-situ observation tests and rotating cylinder method with quantitative analysis. SEM-EDS was employed to analyze the interface between TiO₂ samples and slags, elucidating the dissolution mechanism of TiO₂ in the slag. Results demonstrate that TiO₂ dissolution rate was fastest in the CaO-SiO₂-BaO slag, followed by the low-basicity CaO-SiO₂ slag. Both achieved complete dissolution with shorter durations during the in-situ tests, exhibiting dissolution rates of 0.285 mm/min and 0.281 mm/min respectively in the rotating cylinder tests. Comparatively, TiO₂ dissolution rates decreased significantly in the high-basicity CaO-SiO₂, CaO-SiO₂-Al₂O₃, and CaO-SiO₂-Al₂O₃-BaO systems, with only the CSAB slag completely dissolving (0.151, 0.101 mm/min, and 0.191 mm/min respectively). The primary inhibition mechanism was identified as the formation of high-melting-point CaTiO₃ through reaction between dissolved TiO₂ and CaO in the slag, which elevated local viscosity and melting point of the slags.
- high titanium steel,
- TiO₂ inclusions,
- slag properties,
- dissolution and absorption behavior

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References

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