Research Progress on Anti-clogging Technology of Submerged Entry Nozzles for Continuous Casting

doi:10.19691/j.cnki.1004-4493.2022.04.001

China's Refractories ›› 2022, Vol. 31 ›› Issue (4): 1-6.DOI: 10.19691/j.cnki.1004-4493.2022.04.001

Research Progress on Anti-clogging Technology of Submerged Entry Nozzles for Continuous Casting

LIU Guoqi^{1, 3}, GU Qiang^{1, 3}, LI Hongxia^{1, 3, *}, YUAN Lei², YANG Wengang^{1, 3}, QIAN Fan^{1, 3}, MA Weikui^{1, 3}, YU Jianbin^{1, 3}, YU Jingkun²

1 State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China;
2 Northeastern University, Shenyang 110819, China;
3 Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous;Metal New Materials and Advanced Processing Technology, Luoyang 471023, China

Online:2022-12-15 Published:2022-12-23
Contact: * e-mail: lihongx0622@126.com
About author:Liu Guoqi, born in 1975, received his doctor’s degree in material science from University of Science and Technology Beijing in 2006. He is mainly engaged in functional refractories for basic and applied research. He won a second prize for State Technological Invention Award (ranking 3<sup>rd</sup>) and a first prize of Henan Science and Technology Progress Award (ranking 2<sup>nd</sup>). He has published more than 70 articles in domestic and foreign scientific journals, among which more than 20 papers have been indexed by EI or SCI. He has applied for more than 30 patents and obtained 20 authorized invention patents.

Abstract

Abstract: The causes, the formation process, and the prevention of submerged entry nozzle (SEN) clogging were introduced. The influence of electric field on the SEN clogging was focused on, including the basic theory and measurement of SEN charging, the preliminary research on SEN charging, the influence of molten steel on the wetting behavior of refractory materials in electric field, and the influence of electric field on the oxide inclusions in molten steel. Based on the influence of the hydrodynamics, chemistry and other factors on refractory materials, structure, inclusion particle transfer and adhesion, many anti-clogging researches have been carried out, such as optimizing process conditions, compositing anti-clogging inner lining materials, innovating SEN structure and applying physical fields, which solve the problem of SEN clogging to a certain extent. However, the problems of weak adaptability and superficial study on clogging mechanism are still prominent. The electric field control is a new technology to prevent clogging. Although it has achieved certain results in on-site continuous casting trials, some problems such as the method of applying electric field, the electric field parameters and the equipment still need to be gradually improved, and the surface characteristics of inclusions and SEN materials at high temperatures need to be further studied. It was pointed out that the combination of materials and applied electric field will become an important direction for SEN anti-clogging technology.

Key words: continuous casting, submerged entry nozzle, inclusions, clogging, blocking, electric field

LIU Guoqi, GU Qiang, LI Hongxia, YUAN Lei, YANG Wengang, QIAN Fan, MA Weikui, YU Jianbin, YU Jingkun. Research Progress on Anti-clogging Technology of Submerged Entry Nozzles for Continuous Casting[J]. China's Refractories, 2022, 31(4): 1-6.

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Research Progress on Anti-clogging Technology of Submerged Entry Nozzles for Continuous Casting

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