2019 Pittsburgh AISTech

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A Study of Ferrosilicon-Based Calcium Treatment of Al-Killed and Si-Killed Steels (Room 410)

06 May 19
11:00 AM - 11:30 AM

Tracks: Ladle & Secondary Refining/Metallurgy - Steelmaking & Casting

Calcium contained in ferrosilicon can modify non-metallic inclusions with a higher yield than calcium wire-based processes. Experiments were performed to understand the process. In this study, electrolytic iron melts are deoxidized using Al and Si, then treated with a 75%Si-23%Fe-2%Ca alloy. The samples taken before and after Ca-treatment had their inclusions analyzed via scanning electron microscopy. A new population of inclusions is formed upon Ca treatment, with smaller size distributions than prior to Ca-treatment in both Al and Si-killed cases. A Ca modification mechanism is proposed based on the observations. The evolution of inclusion composition is compared to a kinetic model.