高钛钢连铸结晶器内钢-渣界面反应行为

doi:10.13228/j.boyuan.issn0449-749x.20210551

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Abstract In order to control the steel-slag interface reaction of high titanium steel in the continuous casting process, the steel-slag interface reaction experiment between high titanium steel which the w([Ti]) was 0.05%-1.91% and conventional CaO-SiO₂ system mold flux was conducted by the electromagnetic induction furnace, and then the effect of different Ti contents on the steel-slag interface reaction was systematic analyzed. The rate controlling step of steel-slag interface reaction was judged by two-film theory and elements mass transfer. Meanwhile, the kinetic model was established combining the law of mass conservation and equation of chemical equilibrium, which revealed the mechanism and reaction extent of steel-slag interface reaction. It is found that the extent of steel-slag interface reaction is slight when w([Ti]) is 0.05%. When the w([Ti]) is 0.20% and the reaction is balance, the w([Ti]) in steel and w((SiO₂)) in mold flux are decreased from 0.20% to 0.01% and 31.8% to 29.1%, respectively, and the balance time is 600 s. When the w([Ti]) is 1.91% and the reaction is balance, the w([Ti]) in steel and w((SiO₂)) in mold flux are decreased from 1.91% to 0.05% and 31.77% to 16.98%, respectively, and the balance time is 900 s. It is clearly stated that the extent and equilibration time of steel-slag interface reaction is increased with w(Ti). The mass transfer of Ti, Si in steel and TiO₂, SiO₂ in mold flux all have some impact on the slope of 公式 and t, which means that the mass transfer of them are all the reaction rate controlling step, and the effect of Ti is the most. The change trends of calculated value from kinetic model and experimental value are consistent, which indicates that the model can describe the reaction extent of actual steel-slag interface, furthermore, it provides theoretical guidance for the steel-slag interface reaction of high titanium steel.

Key words： high titanium steel mold flux steel-slag interface reaction kinetic model two-film theory

Received: 07 September 2021

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	PIAO Zhan-long
	WANG Xing-juan
	ZHANG Cai-jun
	ZHU Li-guang
	LI Shao-ying
	WANG Bo

Cite this article:

PIAO Zhan-long,WANG Xing-juan,ZHANG Cai-jun等. Steel-slag interface reaction behavior in continuous casting mold of high titanium steel[J]. Iron and Steel, 2022, 57(3): 61-70.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210551 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I3/61

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