超低碳IF钢夹杂物生成热力学和界面特性

doi:10.13228/j.boyuan.issn1005-4006.20230020

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Abstract The control of deoxidized inclusions in RH refining process of ultra-low carbon IF steel is a key factor affecting the quality of continuous casting slab. In this paper, the properties of inclusions in the actual RH refining and continuous casting process are evaluated, and the equilibrium phase diagram of the Fe-Al-Ti-O component is calculated based on the thermodynamics of Factage software. The interface characteristics between different w(Al)/w(Ti) composition steel liquid and an alumina substrate were measured by improving the horizontal drop method, and the number distribution of inclusions in molten steel for different w(Al)/w(Ti) was counted in the experiment. The results show that there are large clusters of alumina inclusions in actual production, and active elements such as Ti and Mg could adhere to the surface of alumina to form a Mg-Ti-O film. And, the phase diagram calculation results show that the formation of Ti-containing oxide films can be completely inhibited when the Ti content is 0.06% and the Al content is greater than 0.12%. Furthermore, the Al and Ti concentration in molten steel increased from 0.017% and 0.028% to 0.0785% and 0.045%, respectively, and the contact angle between alumina and molten steel increased from 110.93° to 133.73° and decreased to 101.49°, respectively; the purity of molten steel can effectively improve by increasing w(Al)/w(Ti).

Key words： Al deoxidation Ti alloying interface characteristics contact angle cleanliness

Received: 17 March 2023

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	Articles by authors
	ZHAO Ru
	LONG Qian
	WANG Wanlin

Cite this article:

ZHAO Ru,LONG Qian,WANG Wanlin. Researching thermodynamics and interface characteristics of inclusion formation in ultra low carbon IF steel[J]. CONTINUOUS CASTING, 2023, 42(6): 62-69.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20230020 OR http://www.chinamet.cn/Jweb_lz/EN/Y2023/V42/I6/62

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