Viscous properties of new mould flux based on aluminate system with CeO₂ for continuous casting of RE alloyed heat resistant steel

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• 作者：Jie QI ((亓捷))^a ; Chengjun LIU ((刘承军))^a ; ^{liucj@smm.neu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Chunlong LI ((李春龙))^b ; Maofa JIANG ((姜茂发))^a
• 关键词：mould flux ; aluminate melt ; viscosity ; rare earth steel ; heat resistant steel
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：34
• 期：3
• 页码：328-335
• 全文大小：1584 K

文摘

The conventional mould fluxes can not be applied to the continuous casting of RE alloyed heat resistant steel, because severe slag-metal interface reactions occur generally in the mold. To restrain the interface reaction and improve conditions for continuous casting, a new mould flux based on aluminate system was devised. The viscous properties were investigated. Scanning electron microscopy and X-ray diffraction were applied to detect and characterize the crystalline phases in the continuous cooling process. The results showed that appropriate addition of CeO₂ could avoid the precipitation of CaO and decrease the viscosity of the mould flux. Increasing the mass ratio of CaO/Al₂O₃, especially to a value exceeding 1, could worsen the stability of the mould flux. With a content of less than 14 wt.%, Li₂O could reduce the viscosity and breaking temperature, but its effect could be weakened for the promoted precipitation of LiAlO₂. To obtain a mould flux with stable viscous properties, such as viscosity and breaking temperature, appropriate contents of CeO₂ and Li₂O should be controlled to around 10 wt.% and 14 wt.%, while the mass ratio of CaO/Al₂O₃ should not be more than 1.