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Evolution and Transformation of Inclusions in Calcium-Treated Low-Carbon Si–Mn-Killed Steel

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Abstract

In this study, industrial trials were conducted on Si–Mn-killed steels to study the evolution of inclusions and their transformation in steel to meet stringent steel quality. It is observed that inclusions modify along the route of ‘‘MnO–SiO2-based inclusions to CaO–Al2O3-based inclusions after calcium treatment and further transformed to CaO–SiO2–Al2O3-based inclusions’’ in billet stage. As more dissolved oxygen is present in Si-killed steel compared to Al-killed steel; a new generation of SiO2 is taking place during solidification that too adjacent to liquid oxide inclusions (in tundish samples) which are getting transformed to wollastonite and anorthite at the billet stage. The results obtained from industrial trails denoting calcium treatment in Si–Mn-killed steels has an efficient method to get better castability of liquid steel and also is affable to enhance deformation ability of inclusions in steel further during cold rolling process.

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Authors and Affiliations

  1. Research and Development Centre, Visakhapatnam Steel Plant, RINL, Visakhapatnam, India

    Veerababu Gollapalli & Ranjan Kumar Pathak

  2. Corporate Office, Visakhapatnam Steel Plant, RINL, Visakhapatnam, India

    Bhaskara Venkata Rao Mandalika

  3. Steel Melting Shop, Visakhapatnam Steel Plant, RINL, Visakhapatnam, India

    Santanu Dey

  4. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India

    Chenna Rao Borra

Authors
  1. Veerababu Gollapalli
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  4. Santanu Dey
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Gollapalli, V., Pathak, R.K., Mandalika, B.V.R. et al. Evolution and Transformation of Inclusions in Calcium-Treated Low-Carbon Si–Mn-Killed Steel. Trans Indian Inst Met (2024). https://doi.org/10.1007/s12666-024-03308-w

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