含钛夹杂物对连铸保护渣性能的影响

doi:10.13228/j.boyuan.issn1005-4006.20200144

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Abstract During the continuous casting process, titanium nitride inclusions are precipitated in the Ti-bearing steel and participate in the steel-slag interface reaction, which seriously deteriorates the physical and chemical properties of the traditional mold flux for Ti-bearing steel. This study measured the influence of different contents of TiN and TiO₂ on the melting temperature, viscosity, crystallization ratio and solidification temperature of mold fluxes with different basicity. The results show that TiN has the greatest impact on the performance of CaO-SiO₂ based mold fluxes. With the increase of TiN content, the viscosity, crystallization ratio and solidification temperature of mold fluxes extremely increase. When the mass fraction of TiN is greater than 5%, the melting point increase sharply. The properties of CaO-Al₂O₃ are sensitive to the TiO₂ content. When TiO₂ is less than 4%, the viscosity and solidification temperature of the mold flux can be reduced slightly. When the TiO₂ is larger than 10%, the perovskite is the main precipitated phase in the mold flux and the performance of mold flux is seriously deteriorated, which is not conducive to the lubrication effect on the billet shell. By comparing three basic mold fluxes with different basicity, it is found that CaO-SiO₂-Al₂O₃-based mold can absorb titanium inclusions preferably.

Key words： mold flux Ti-bearing steel TiN inclusion clogging TiO₂ inclusion

Received: 16 December 2020

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	CHEN Zhuo
	ZHENG Rui-qi
	WANG Qian

Cite this article:

CHEN Zhuo,ZHENG Rui-qi,WANG Qian. Effect of titanium inclusions on performance of mold flux during continuous casting of Ti-bearing steel[J]. CONTINUOUS CASTING, 2021, 40(2): 33-37.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20200144 OR http://www.chinamet.cn/Jweb_lz/EN/Y2021/V40/I2/33

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