高钛钢专用连铸保护渣研究现状及展望

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Abstract With the continuous development of the steel industry, machinery, construction, automobile, aviation, locomotive and other industries have also made great progress. At the same time, the use requirements and service conditions of steel materials are becoming more and more demanding, and the properties of steel gradually expand to high strengthening, high toughness, wear resistance, heat resistance and corrosion resistance, easy welding and so on. High titanium steel with low cost and high added value has been paid more attention.
Ti is added to the steel as a micro-alloy element or alloy element. Ti has a strong affinity with C, N, S, which can refine the grain, improve toughness, wear resistance and intergranular corrosion resistance. But, Ti is also an easy-to-oxidize element, and it easily reacts with protective powder during the continuous casting process to form TiN, Ti(CN), TiO₂ and other high-melting compounds, which seriously deteriorates the metallurgical performance of the mold flux, and at the same time forms "floater" on the steel surface of the mold, which hinders the flow of mold flux between the billet shell and the mold, making high-titanium steel difficult to achieve multi-furnace continuous casting, the casting billet appears a series of surface defects such as sags, cracks, slag inclusions, and even causes breakout by steaking.
This article summarizes the research progress of high-titanium steel protection slag, and introduces the reaction behavior of Ti at the mold steel slag interface during the casting of high-titanium steel and the influence of Ti on the mold flux after entering the mold flux. It is proposed to draw on the experience of low (non-)reactive CaO-Al₂O₃ based mold powder for high-aluminum steel, and make full use of the role of Ti in the mold powder, and use TiO₂ as a replacement component of fluorine to develop fluorine-free mold powder. The purpose is to develop fluorine-free mold flux for high-titanium steel to provide important basic data and theoretical support, accelerate the industrialization of green and environmental mold flux, and promote technological progress and technological innovation in the production process of high-titanium steel in China.

Key words： high-titanium steel fluoride free mold flux reaction of steel-slag interface floater

Published: 16 July 2021

CLC number:

TF777

Fund:National Natural Science Foundation of China(5197413,51774141), Natural Science Foundation of Hebei Province(E2019209543).

About author:: Xingjuan Wang is a professor at the College of Metallurgy and Energy,North China University of Science and Technology.In 2002,she graduated from Hebei Polytechnic University with a bachelor's degree in College of Metallurgy and Energy. In 2005,she graduated from the same school with a master's degree.And she received her Ph.D. degree in University of Science and Technology Beijing in 2013. Her research interests are technical innovation and process optimization for defect-free solidification and high efficiency continuous casting.

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	Articles by authors
	WANG Xingjuan
	QU Shuo
	LIU Ran
	ZHU Liguang
	PIAO Zhanlong
	DI Tiancheng
	WANG Yu

Cite this article:

WANG Xingjuan,QU Shuo,LIU Ran, et al. Research Status and Prospect of Special Mold Flux for High Titanium Steel[J]. Materials Reports, 2021, 35(Z1): 467-472.

URL:

http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2021/V35/IZ1/467

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