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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Materials Processing Fundamentals
Presentation Title The Effect of a Sulfur Addition on the Formation and Behavior of CaS Inclusions in a Steel Melt during a Secondary Refining Process without a Ca-treatment
Author(s) Takanori Yoshioka, Yuta Shimamura, Andrey Karasev, Yasuhide Ohba, Pär Jönsson
On-Site Speaker (Planned) Takanori Yoshioka
Abstract Scope This study aims to elucidate the effect of an S addition on the formation and behavior of CaS during a secondary refining process of a high-S containing steel (S=0.055%) without a Ca-treatment. By adding FeS during an RH process, the CaO content in inclusions decreases and the CaS content increases. According to SEM/EDS analysis, CaS-covered inclusions are frequently detected after the FeS addition. Thermodynamic calculations show that a CaS phase can be formed in two ways: the reaction between dissolved Ca and S, and the reaction between CaO in inclusions and dissolved S. From the viewpoint of interfacial features, the inclusions covered by the CaS phase possess low interfacial energies. Therefore, CaS-covered inclusions tend to remain in a steel melt. Thus, a nozzle clogging can be caused by CaS in the production of high-S containing steels without a Ca-treatment.
Proceedings Inclusion? Planned: None Selected

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