Research on Ladle Nozzle Clogging during Continuous Casting of Non-Oriented Electrical Steel with High Silicon

• Autorzy: Kong Wei , Cang Da-Qiang

Identyfikatory

DOI

10.24425/amm.2019.126246

• Języki publikacji: EN

Abstrakty

EN

To figure out the reason causing ladle nozzle clogging during CC (continuous casting) of a non-oriented electrical steel with high silicon (or HNO for short) and get a method to address it, this paper studied the theoretical calculation of flow rates during CC, the inclusions around the slide gate where ladle nozzle clogging happened, and Ca-treatment at the end of RH for decreasing ladle clogging of the electrical steel both theoretically and practically. The results showed that: The bigger diameter of a nozzle or less nozzle clogging can guarantee an enough flow rate for reaching the target casting speed. Ladle nozzle clogging can be predicted by comparing the percentage of slide gate opening. Al₂ O₃ and its composite inclusions were the main reason that caused the ladle nozzle clogging of the electrical steel. Higher [Al] or TO will increase the amount of Pure Ca wires for Ca-treatment. The results of the verification tests fit the thermodynamic calculation, and Ca-treatment using pure Ca wires could prevent ladle nozzles from clogging without affecting the magnetic properties of the electrical steel.

Słowa kluczowe

EN

electrical steel; ladle nozzle; clogging; CC

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2019
• Tom: Vol. 64, iss. 1
• Strony: 257--264
• Opis fizyczny: Bibliogr. 15 poz., fot., rys., tab., wzory

Twórcy

autor

Kong Wei

• University of Science and Technology Beijing, National Center for Materials Service Safety, Beijing, 100083, China

autor

Cang Da-Qiang

• University of Science and Technology Beijing, School of Metallurgical and Ecological Engineering, Beijing, China

Bibliografia

• [1] H. Bai, B. G.Thomas, Effects of clogging, argon injection, and continuous casting conditions on flow and air aspiration in submerged entry nozzles [J]. Metallurgical & Materials Transactions B 32 (4), 707-722 (2001).
• [2] A. Ramos-Banderas, R. D. Morales, Sánchez-Pérez R. et al., Dynamics of two-phase downwards flows in submerged entry nozzles and its influence on the two-phase flow in the mold [J]. International Journal of Multiphase Flow 31 (5), 643-665 (2005).
• [3] T. Wondrak, S. Eckert, G. Gerbeth et al., Combined Electromagnetic Tomography for Determining Two-phase Flow Characteristics in the Submerged Entry Nozzle and in the Mold of a Continuous Casting Model [J]. Metallurgical & Materials Transactions B 42 (6), 1201-1210 (2011).
• [4] X. Wan, C. Han, K. Cai et al., Experimental research of submerged entry nozzle of slab continuous casting [J]. Iron & Steel 35 (9), 20-23 (2000).
• [5] Y. Tsukaguchi, H. Hayashi, H. Kurimoto et al., Development of Swirling-flow Submerged Entry Nozzles for Slab Casting [J]. Tetsu-to-Hagane 50 (5), 721-729 (2011).
• [6] R. Dekkers, B. Blanpain, P. Wollants et al., A Morphological Comparison between Inclusions in Aluminium Killed Steels and Deposits in Submerged Entry Nozzle [J]. Steel Research International 74 (6), 351-355 (2003).
• [7] R. Siebert, A. Wetzig, E. Beyer et al., Localized investigation of magnetic bulk property deterioration of electrical steel: Analysing magnetic property drop thorough mechanical and laser cutting of electrical steel laminations using neutron grating interferometry [C], Electric Drives Production Conference IEEE 1-5 (2013).
• [8] Y. H. Sha, F. Zhang, S. C. Zhou et al., Improvement of recrystallization texture and magnetic property in non-oriented silicon steel by asymmetric rolling [J]. Journal of Magnetism & Magnetic Materials 320 (3-4), 393-396 (2008).
• [9] D. Dong, C. Liu, B. Zhang et al., Effect of laser cladding high silicon coating on property of silicon steel [J]. Chinese Journal of Materials Research 21 (4), 364-370 (2007).
• [10] G. H. Geiger, D. R. Poirier, Transport Phenomena in Metallurgy [M], Addison Wesley, 10-12 (1973).
• [11] K. W. Yi, C. Tse, J. H. Park et al., Determination of dissolution time of Al2O3 and MgO inclusions in synthetic Al2O3-CaO-MgO slags [J]. Scandinavian Journal of Metallurgy 32 (4), 177-184 (2003).
• [12] Y. Higuchi, M. Numata, S. Fukagawa et al., Inclusion Modification by Calcium Treatment [J]. ISIJ International 36 (Suppl), 151-154 (1996).
• [13] J. H. Park, S. B. Lee, S. K. Dong, Inclusion control of ferritic stainless steel by aluminum deoxidation and calcium treatment [J]. Metallurgical & Materials Transactions B 36 (1), 67-73 (2005).
• [14] V. Singh, Inclusion modification in steel castings using automated inclusion analysis [D]. Missouri University of Science and Technology, 103-112 (2009).
• [15] K. Chattopadhyay, S.M.S. Kumar, Thermodynamic Evaluation of Inclusion Formation and Nozzle Clogging During Slab Casting [C], AISTech. 2014, 9-10 (2014).

Uwagi

EN

1. This work has been financially supported by "the Fundamental Research Funds for the Central Universities” (Grant No. FR F-TP-16-038A1).

PL

2. Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).