Research overview of formation and heat transfer of slag film in mold during continuous casting

被引：0

作者：

Wen G.-H. ^{[1
]}

Yang C.-L. ^{[1
]}

Tang P. ^{[1
]}

机构：

[1] College of Materials Science and Engineering, Chongqing University, Chongqing

来源：

Gongcheng Kexue Xuebao/Chinese Journal of Engineering | 2019年 / 41卷 / 01期

关键词：

Continuous casting; Interfacial thermal resistance; Mold flux; Radiation; Slag film;

D O I：

10.13374/j.issn2095-9389.2019.01.002

中图分类号：

学科分类号：

摘要：

Mold flux, which plays an important role in continuous casting, occurs when liquid slag on top of the molten steel infiltrates the gap between the shell and mold. During this process, a liquid slag film forms on the shell side, whereas a solid slag film forms on the mold side. The behavior of the slag film between the shell and mold has a significant effect on the sequence casting and quality of the slab surface. To investigate the in-mold behavior and heat transfer of slag film, researchers have simulated the formation of slag film in the laboratory. Measurements and theoretical calculations have been performed to study the heat transfer of slag film. In this paper, the experimental methods used to simulate the formation of slag film were described and the research related to heat transfer in slag film was summarized, including the interfacial thermal resistance, the thermal conductivity of the mold flux, radiative heat transfer, and optical properties of the slag film. The issues related to the formation and heat transfer of slag film were also identified, that require further investigation. The results of recent studies indicate that the hot thermocouple technique could be applied to observe the formation of slag film, and the copper-finger dig test could be used to obtain samples for investigations related to the microstructure of solid slag film. The interfacial heat resistance is reported to be between 0.0002 and 0.002 m2•K•W-1. The thermal conductivity of mold flux at 800℃ ranges from 1.0-2.0 m2•K•W-1, and increases with increased temperature. Crystals in the solid slag film not only increase the interfacial heat resistance, but also decrease the radiative heat flux by reducing the reflectivity of slag film. Furthermore, due to the resulting change in optical properties, the addition of transition metal oxides and fine particles dispersed in slag film may also influence the radiative heat transfer through slag film. © All right reserved.

引用

页码：12 / 21

页数：9

共 37 条

[1] Mills K.C., Fox A.B., Li Z., Et al., Performance and properties of mould fluxes, Ironmak Steelmak, 32, 1, (2005)
[2] Mills K.C., Fox A.B., The role of mould fluxes in continuous casting-So simple yet so complex, ISIJ Int, 43, 10, (2003)
[3] Mills K.C., Courtney L., Fox A.B., Et al., The use of thermal analysis in the determination of the crystalline fraction of slag films, Thermochim Acta, 391, 1-2, (2002)
[4] Zhang P., Wei Q.C., Wang J.Y., Et al., Present state of research on heat transfer of casting flux film in continuous casting mold, J Iron Steel Res, 7, 4, (1995)
[5] Meng Y., Thomas B.G., Simulation of microstructure and behavior of interfacial mold slag layers in continuous casting of steel, ISIJ Int, 46, 5, (2006)
[6] Kashiwaya Y., Cicutti C.E., Cramb A.W., Et al., Development of double and single hot thermocouple technique for in situ observation and measurement of mold slag crystallization, ISIJ Int, 38, 4, (1998)
[7] Zhou L.J., Wang W.L., Liu R., Et al., Computational modeling of temperature, flow, and crystallization of mold slag during double hot thermocouple technique experiments, Metall Mater Trans B, 44, 5, (2013)
[8] Li J., Wang W.L., Wei J., Et al., A kinetic study of the effect of Na2O on the crystallization behavior of mold fluxes for casting medium carbon steel, ISIJ Int, 52, 12, (2012)
[9] Lu B.X., Chen K., Wang W.L., Et al., Effects of Li2O and Na2O on the crystallization behavior of lime-aliminum-based mold flux for casting high-Al steels, Metall Mater Trans B, 45, 4, (2014)
[10] Gao J.X., Wen G.H., Sun Q.H., Et al., The influence of Na2O on the solidification and crystallization behavior of CaO-SiO2-Al2O3 based mold flux, Metall Mater Trans B, 46, 4, (2015)

← 1 2 3 4 →