高钛钢专用连铸保护渣研究现状及展望

材料导报

2021, Vol. 35

Issue (Z1): 467-472

金属与金属基复合材料

高钛钢专用连铸保护渣研究现状及展望

王杏娟^1,2, 曲硕^1,2, 刘然¹, 朱立光³, 朴占龙^2,4, 邸天成^1,2, 王宇^1,2

1 华北理工大学冶金与能源学院,唐山 063210
2 河北省高品质钢连铸工程技术研究中心,唐山 063000
3 河北科技大学材料科学与工程学院,石家庄 050018
4 北京科技大学冶金与生态学院,北京 100083

Research Status and Prospect of Special Mold Flux for High Titanium Steel

WANG Xingjuan^1,2, QU Shuo^1,2, LIU Ran¹, ZHU Liguang³, PIAO Zhanlong^2,4, DI Tiancheng^1,2, WANG Yu^1,2

1 College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China
2 Hebei Engineering Research Center of High Quality Steel Continuous Casting, Tangshan 063000, China
3 School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
4 School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing, Beijing 100083,China

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摘要随着钢铁业的不断发展,机械、建筑、汽车、航空、机车等行业也取得长足进步,同时对钢铁材料的使用要求和服役条件也越来越苛刻,钢材性能逐步向高强化、高韧性、耐磨耐热耐蚀、易焊接等方面扩展。低成本、高附加值的高钛钢越来越受到重视。
将Ti以微合金元素或合金元素加入钢中,Ti与C、N、S有极强的亲合力,可细化晶粒,提高韧性、耐磨性能及晶间抗腐蚀能力。但同时Ti为易氧化元素,连铸过程中容易与保护渣反应生成TiN、Ti(CN)、TiO₂等高熔点化合物,严重恶化了保护渣冶金性能,同时结晶器钢液面形成“结鱼”, 阻碍了坯壳与结晶器之间的保护渣流入通道,使得高钛钢难以实现多炉连浇,铸坯出现凹陷、裂纹、夹渣等一系列表面缺陷,甚至引起粘结漏钢。
本文归纳了高钛钢保护渣的研究进展,分别对高钛钢浇注过程中结晶器钢渣界面上Ti的反应行为与Ti进入保护渣后对保护渣性能的影响规律进行介绍,提出借鉴高铝钢低(非)反应性CaO-Al₂O₃基专用保护渣的经验,同时充分利用Ti在保护渣中的作用,将TiO₂作为氟的替代组元,开发无氟保护渣。以期为开发高钛钢专用无氟保护渣提供重要的基础数据和理论支持,加快保护渣绿色环保的工业化进程,推动我国高钛钢生产工艺领域的技术进步和技术创新。

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	王宇

关键词: 高钛钢无氟保护渣钢渣界面反应结鱼

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

发布日期: 2021-07-16

ZTFLH:

TF777

基金资助: 国家自然科学基金(5197413;51774141);河北省自然科学基金(E2019209543)

通讯作者: wxingjuan@ncst.edu.cn;zhuliguang@ncst.edu.cn

作者简介: 王杏娟,华北理工大学冶金与能源学院教授。2002 年河北理工学院冶金系本科毕业,2005 年同校系硕士研究生毕业留校任教,2013 年获北京科技大学博士学位。主要研究方向为无缺陷凝固与高效化连铸的技术创新与工艺优化。

引用本文:

王杏娟, 曲硕, 刘然, 朱立光, 朴占龙, 邸天成, 王宇. 高钛钢专用连铸保护渣研究现状及展望[J]. 材料导报, 2021, 35(Z1): 467-472.
WANG Xingjuan, QU Shuo, LIU Ran, ZHU Liguang, PIAO Zhanlong, DI Tiancheng, WANG Yu. Research Status and Prospect of Special Mold Flux for High Titanium Steel. Materials Reports, 2021, 35(Z1): 467-472.

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http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2021/V35/IZ1/467

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