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The formation of non‐metallic endogenous inclusions in ladle‐furnace treatment of a resulphurised C‐Mn Al‐killed steel was investigated. A model based on equilibrium reactions and using as input data compositions and temperatures measured at various stages of secondary steelmaking was developed and applied to different routine and experimental heats. Microstructural analyses were carried out on samples systematically extracted from ladle and from tundish. Detailed characterisation of inclusion morphology and composition was carried out to investigate their properties in the present resulphurised steel and to evaluate reactions taking place during different phases of ladle treatment. The experimental results were also used to validate the theoretical model. A good agreement between predicted concentrations of inclusions and experimentally measured values was obtained.
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Mapelli et al. (2000) studied this question.
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