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Formation of Low-Melting-Point Inclusions in Al-Deoxidized Steel Refined by High-Basicity Calcium Aluminate Slag in ZrO2 Crucible Experiments

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Abstract

ZrO2 crucible experiments were carried out in the laboratory to study the formation of low-melting-point inclusions in steel, during which aluminum deoxidization and a high-basicity calcium aluminate refining slag (CaO/SiO2: 6 to 8, Al2O3 40 to 45 pct) were used. Four experiments were done with different slag/steel reaction times (30, 60, 90, and 180 minutes). It was found that inclusions were mainly composed of CaO-Al2O3-ZrO2 with very limited SiO2, in spherical morphology and with sizes mainly less than 5 μm. They can be classified into two types according to the ZrO2 content. The first type contained much lower ZrO2, whereas a much higher level of ZrO2 was detected in the other type. An evolution of inclusions with the reaction time was observed and studied. The obtained results indicated that chemical compositions of inclusions were widely scattered in the CaO-Al2O3-ZrO2 phase diagram after 30 min reaction. However, the composition of inclusions became much more uniform and concentrated in low-melting-temperature regions at 60, 90, and 180 minutes, which would be favorable to prevent nozzle clogging and fatigue problems. Compared with the authors’ previous results obtained in MgO crucible experiments, it was found that low-melting-temperature inclusions can be targeted in shorter time in ZrO2 crucible experiments, without any degradation of cleanliness.

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Acknowledgments

This research is supported by the National Basic Research Program of China (No. 2010CB630806) and National Natural Science Foundation of China (No. 51304013). The authors want to express sincere appreciation to Dr. H. Todoroki of Nippon Yakin Kogyo Co., Ltd., for fruitful discussions and nice suggestions during the preparation of this article.

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Correspondence to Min Jiang.

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Manuscript submitted November 22, 2013.

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Jiang, M., Wang, XH. & Pak, JJ. Formation of Low-Melting-Point Inclusions in Al-Deoxidized Steel Refined by High-Basicity Calcium Aluminate Slag in ZrO2 Crucible Experiments. Metall Mater Trans B 45, 1248–1259 (2014). https://doi.org/10.1007/s11663-014-0045-8

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  • DOI: https://doi.org/10.1007/s11663-014-0045-8

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