Study on inhibition of clogging of submerged entry nozzle by electric pulse technology
YANG Xin1, ZHANG Yuan-yuan1, HE Zhi-Jun1, ZHANG Jun-hong1, ZHAN Wen-long1, YU Jing-kun2
1. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China; 2. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
Abstract：The spontaneous electric field exists on the surface of the submerged entry nozzle during the pouring process,which will cause interface effects such as electrowetting and electrochemical reaction to seriously affect the clogging of the nozzle. Industrial tests were carried out on the continuous casting platform,and the results showed that the thickness of clogging in the inner cavity of the nozzle can reach 10 mm without electric field treatment,and the tapping hole is seriously blocked; After the electric pulse treatment,the inner cavity of the nozzle is smooth,and there are no obvious clogging in the tapping hole. The interface effect caused by the spontaneous electric field on the surface of the nozzle can be weakened or eliminated by electrical pulse treatment so that the clogging of the nozzle is effectively suppressed and the service life of the nozzle is extended.
杨鑫, 张媛媛, 何志军, 张军红, 湛文龙, 于景坤. 基于电脉冲技术抑制连铸水口结瘤堵塞的研究[J]. 钢铁, 2021, 56(4): 52-56.
YANG Xin, ZHANG Yuan-yuan, HE Zhi-Jun, ZHANG Jun-hong, ZHAN Wen-long, YU Jing-kun. Study on inhibition of clogging of submerged entry nozzle by electric pulse technology[J]. Iron and Steel, 2021, 56(4): 52-56.
[1] Svensson J K,Memarpour A,Ekerot S,et al. Studies of new coating materials to prevent clogging of submerged entry nozzle(SEN) during continuous casting of Al killed low carbon steels[J]. Ironmaking and Steelmaking,2017,44(2):117. [2] DENG Z Y,ZHU M Y,ZHOU Y L,et al. Attachment of alumina on the wall of submerged entry nozzle during continuous casting of Al-killed steel[J]. Metallurgical and Materials Transactions B,2016,47(3):2015. [3] 曾志崎,杨乾坤,艾克南,等. 49MnVS非调质钢水口堵塞原因分析[J]. 钢铁,2019,54(1):49.(ZENG Zhi-qi,YANG Qian-kun,AI Ke-nan,et al. Analysis on nozzle clogging of 49MnVS steel during production[J]. Iron and Steel,2019,54(1):49.) [4] 刘明华,董小明,唐成伟,等. 连铸结晶器石英水口蚀损机理分析[J]. 中国冶金,2019,29(5):66.(LIU Ming-hua,DONG Xiao-ming,KANG Cheng-wei,et al. Analysis on erosion mechanism of quartz-based nozzle for continuous casting tundish[J]. China Metallurgy, 2019,29(5):66.) [5] 李璟宇,成国光,陈兴润,等. 含钛超纯铁素体不锈钢水口结瘤机制研究[J]. 连铸,2019,44(2):44.(LIU Jing-yu,CHENG Guo-guang,CHEN Xing-run,et al. Study on nodulation mechanism of nozzle in titanium-containing ultra-pure ferrite stainless steel[J]. Continuous Casting,2019,44(2):44.) [6] 隋亚飞,徐刚军,周军军,等. CPS含铝电工钢水口堵塞问题的研究和解决[J]. 连铸,2019,44(4):1.(SUI Ya-fei,XU Gang-jun,ZHOU Jun-jun,et al. Research and solution of CPS aluminum containing electrical steel nozzle blocking problem[J]. Continuous Casting,2019,44(4):1.) [7] 杨明磊,程常桂,李阳,等. 连铸中间包水口堵塞机理及控制技术的发展[J]. 钢铁研究学报,2017,29(10):773.(YANG Ming-lei,CHENG Chang-gui,LI Yang,et al. Development of control technology and clogging mechanism for tundish nozzle in continuous casting[J]. Journal of Iron and Steel Research,2017,29(10):773.) [8] 朱苗勇. 新一代高效连铸技术发展思考[J]. 钢铁,2019,54(8):21.(ZHU Miao-yong. Thoughts on the development of a new generation of efficient continuous casting technology[J]. Iron and Steel,2019,54(8):21.) [9] 连朋飞. 电磁场下铝镁质耐火材料与熔渣的界面行为研究[D]. 武汉:武汉科技大学,2018.(LIAN Peng-fei. Study on the Interface Behavior of Aluminum-Magnesium Refractories and Slag under Electromagnetic Field[D]. Wuhan:Wuhan University of Science and Technology,2018.) [10] YANG X,YU J K,LIU Z Y,et al. The charged characteristics of the submerged entry nozzle used for continuous casting[J]. Ceramics International,2017,43(2):2881. [11] YANG X,HE Z J,YU J K,et al. Influence of interface electric field on interaction between molten iron and refractory interface[J]. Ceramics International,2020,46(8):10180. [12] 刘朝阳,于景坤,袁磊,等. 外加电流对钢中夹杂物影响的研究进展[J]. 中国冶金,2018,28(4):7.(LIU Zhao-yang,YU Jing-kun,YUAN Lei,et al. Research progress of effects of external electric current on inclusions in molten steel[J]. China Metallurgy,2018,28(4):7.) [13] Taniguchi S,Brimacombe J K. Application of pinch force to the separation of inclusion particles from liquid steel[J]. ISIJ Int,1994,34:722. [14] Sellier A. Migration of an insulating particle under the action of uniform ambient electric and magnetic fields. Part 2. Boundary formulation and ellipsoidal particles[J]. J Fluid Mech,2003,488:335. [15] WANG X L,GUO J D,WANG Y M,et al. Segregation of lead in Cu-Zn alloy under electric current pulses[J]. Appl Phys Lett,2006,89:061910. [16] Qin R S,Bhowmik A. Computational thermodynamics in electric current metallurgy[J]. Mater Sci Technol,2015,31:1560. [17] ZHANG L F,WANG S Q,DENG A P,et al. Application of electromagnetic(EM)separation technology to metal refining processes:A review[J]. Metall Mater Trans B,2014,45:2153. [18] ZHANG X,QIN R. Controlled motion of electrically neutral microparticles by pulsed direct current[J]. Scientific Reports,2015,5:10162. [19] ZHANG X,QIN R. Separation of electrically neutral nonmetallic inclusions from molten steel by pulsed electric current[J]. Materials Science and Technology,2017,33(12):1. [20] LU W J,ZHANG X F,QIN R S. Stability of precipitates under electropulsing in 316L stainless steel[J]. Materials Science and Technology,2015,13:1. [21] DAI W B,ZHOU X L,YANG X,et al. Formation of dense inclusion buildup on submerged entry nozzle electric current pulse [J]. Acta Metall Sin(Engl Lett),2016,29(5):500.
2021, Vol. 56 
