M. Sumida, M. Nadif
Steel cleanliness has a significant influence on the properties of long product quality steel, as evidenced by recent studies indicating a direct relationship between total oxygen content in steel and surface defect rates in final products. This review aims to examine various aspects of mitigating re-oxidation of molten steel and preventing submerged entry nozzle clogging, which are crucial for achieving required product cleanliness. Several methodologies employed for quantifying re-oxidation include measuring slag FeO content and identifying inclusions through rare earth tracing techniques. Specifically, a lanthanum tracing method developed by ArcelorMittal serves as a unique approach for analyzing de-oxidation inclusions in aluminum-killed steels. Control measures against re-oxidation through slag reactions are discussed, highlighting the gradients of oxygen and de-oxidants at the slag/metal interface which influence inclusion precipitation. The discussion extends to the implications of re-oxidation on different steel grades, suggesting that the formation of harmful inclusions may vary depending on the steel's composition and intended application. Overall, the findings underscore the need for targeted strategies to enhance steel cleanliness and minimize defects in production processes.
@article{96db5733-d2ca-45eb-b409-6060327fad25,
title={Control of steel reoxidation and CC nozz},
author={M. Sumida and M. Nadif},
year={2026},
language={en}
}TY - JOUR TI - Control of steel reoxidation and CC nozz AU - M. Sumida AU - M. Nadif PY - 2026 LA - en ER -
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