Abstract
The evolution behaviors of the type, amount, and size of inclusions in tinplate were studied by industrial experiments and thermodynamic calculations during RH refining process. The results indicated that Al2O3 inclusions were generated at first after Al addition. With the slag-steel and refractory-steel reactions, inclusions varied with the route as Al2O3 inclusions → CaO–Al2O3 system inclusions → CaO–MgO–Al2O3 system inclusions and Al2O3 inclusions → MgO–Al2O3 spinel inclusions → CaO–MgO–Al2O3 system inclusions. From Al addition to the end of RH refining, the number density of inclusions increased from 9.32 to 4.09 per mm2. The total oxygen content in steel could be decreased from 450 to 37 ppm. The size of inclusions varied mainly less than 10 μm, the proportion of inclusions with size less than 5 μm gradually decreased by 15% and inclusions in the range of 5–10 μm increased by 10%. These inclusions with size less than 10 μm were difficult to be removed from liquid steel through the floatation. The inclusions were Al2O3 and CaO·Al2O3 inclusions with a high melting point at the end of RH refining. In order to obtain inclusions with a low melting point, the reasonable C/A mass ratio of the final RH slag is 1.10 through theoretical calculations.
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References
Kaushik P, Lowry M, Yin H, Pielet H (2012) Inclusion characterisation for clean steelmaking and quality control. Ironmaking Steelmaking 39(4):284–300
Deng ZY, Zhu MY (2013) Evolution mechanism of non-metallic inclusions in Al-killed alloyed steel during secondary refining process. ISIJ Int 53(3):450–458
Yang GW, Wang XH, Huang FX, Wang WJ, Yin YQ, Tang C (2014) Influence of reoxidation in tundish on inclusion for Ca-treated Al-killed steel. Steel Res Int 85(5):784–792
Li SJ, Cheng GG, Miao ZQ, Dai WX, Chen L, Liu ZQ (2018) Evolution of oxide inclusions in G20CrNi2Mo carburized bearing steel during industrial electroslag remelting. ISIJ Int 58(10):1781–1790
Park JH, Todoroki H (2010) Control of MgO·Al2O3 spinel inclusions in stainless steels. ISIJ Int 50(10):1333–1346
Park JH, Lee SB, Gaye HR (2008) Thermodynamics of the formation of MgO–Al2O3–TiOx inclusions in Ti-stabilized 11Cr ferritic stainless steel. Metall Mater Trans B 39(6):853–861
Kang YJ, Li F, Morita K, Du SC (2006) Mechanism study on the formation of liquid calcium aluminate inclusion from MgO–Al2O3 spinel. Steel Res Int 77(11):785–792
Jiang M, Wang XH, Chen B, Wang WJ (2008) Formation of MgO·Al2O3 inclusions in high strength alloyed structural steel refined by CaO–SiO2–Al2O3–MgO slag. ISIJ Int 48(7):885–890
Jiang M, Wang XH, Chen B, Wang WJ (2010) Laboratory study on evolution mechanisms of non-metallic inclusions in high strength alloyed steel refined by high basicity slag. ISIJ Int 50(1):95–104
Jiang M, Wang XH, Chen B, Wang WJ (2012) Study on refining slags targeting high cleanliness and lower melting temperature inclusions in Al killed steel. Ironmaking Steelmaking 39(1):20–25
Jiang M, Wang XH, Wang WJ (2010) Control of non-metallic inclusions by slag-metal reactions for high strength alloying steels. Steel Res Int 81(9):759–765
Zhang LF, Thomas BG (2003) State of the art in evaluation and control of steel cleanliness. ISIJ Int 43(3):271–291
Shi CB, Chen XC, Guo HJ, Zhu ZJ, Ren H (2012) Assessment of oxygen control and its effect on inclusion characteristics during electroslag remelting of die steel. Steel Res Int 83(5):472–486
Suito H, Inoue R (1996) Thermodynamics on control of inclusions composition in ultraclean steels. ISIJ Int 36(5):528–536
Sigworth GK, Elliott JF (1974) The thermodynamics of liquid dilute iron alloys. Metal Sci 8(1):298–310
Ohta H, Suito H (1996) Activities in CaO–MgO–Al2O3 slags and deoxidation equilibria of Al, Mg, and Ca. ISIJ Int 36(8):983–990
Itoh H, Hino M, Ban-ya S (1997) Assessment of Al deoxidation equilibrium in liquid iron. Tetsu-To-Hagané 83(12):773–778
Kishi M, Inoue R, Suito H (1994) Thermodynamics of oxygen and nitrogen in liquid Fe-20mass%Cr alloy equilibrated with titania-based slags. ISIJ Int 34(11):859–867
Zhao DW, Li HB, Bao CL, Yang J (2015) Inclusion evolution during modification of alumina inclusions by calcium in liquid steel and deformation during hot rolling process. ISIJ Int 55(10):2115–2124
Ren Y, Zhang LF (2016) Thermodynamic model for prediction of slag-steel-inclusion reactions of 304 stainless steels. ISIJ Int 57(1):68–75
Acknowledgements
This work was supported by National Key R&D Program of China [Grant numbers 2016YFB0300602, 2017YFB0304201 and 2017YFB0304203] and National Natural Science Foundation of China [Grant numbers 51774072, 51774073 and 51974080].
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Li, X., Wang, N., Chen, M. (2021). Study on Evolution of Inclusions in Tinplate Production During RH Refining—Continuous Casting Process. In: Lee, J., Wagstaff, S., Anderson, A., Tesfaye, F., Lambotte, G., Allanore, A. (eds) Materials Processing Fundamentals 2021. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-65253-1_5
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DOI: https://doi.org/10.1007/978-3-030-65253-1_5
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