Effects of CeO2 on melting temperature, viscosity and structure of mold fluxes for the continuous casting of rare earths alloyed heavy railway steels were studied. Results showed that the melting temperature of mold fluxes with 0, 4, 8 and 12 wt% CeO2 contents were 1066, 1088, 1090 and 1102 °C, respectively. Moreover, the viscosity values at 1300 °C were 0.40, 0.38 and 0.34 Pa s, but the viscosity of slags with 12 wt% CeO2 could not be measured because slags were solid. Therefore, the viscosity at 1300 °C decreased with the increasing of CeO2 contents, although the melting temperature increased. Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) confirmed that CeO2 enhanced the de-polymerization of mold fluxes, and the relative percentage content of O2− in melts increased, leading to the viscosity decrease at 1300 °C.
CeO2Melting temperature Viscosity Structure RE steel
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This work was supported by National Natural Science Foundation of China (Grant No. 51774024).
Yamauchi A, Sorimachi K, Sakuraya T, Fujii T (1993) Heat transfer between mold and strand through mold flux film in continuous casting of steel. ISIJ Int 33(1):140–147CrossRefGoogle Scholar
Cho J, Shibata H, Emi T, Suzuki M (1998) Thermal resistance at the interface between mold flux film and mold for continuous casting of steels. ISIJ Int 38(5):440–446CrossRefGoogle Scholar
Mahapatra RB, Brimacombe JK, Samarasekera IV (1991) Mold behavior and its influence on quality in the continuous casting of steel slabs: part II. Mold heat transfer, mold flux behavior, formation of oscillation marks, longitudinal off-corner depressions, and subsurface cracks. Metall Mater Trans B 22(6):875–888CrossRefGoogle Scholar
Narita K (1975) Physical chemistry of the groups IVa (Ti, Zr), Va (V, Nb, Ta) and the rare earth elements in steel. Trans ISIJ 15(3):145–152Google Scholar
Fu H, Xiao Q, Kuang J, Jiang Z, Xing J (2007) Effect of rare earth and titanium additions on the microstructures and properties of low carbon Fe–B cast steel. Mater Sci Eng A 466(1–2):160–165CrossRefGoogle Scholar