Effect of Si Content on Oxide Formation on Surface of Molten Fe-Cr-C Alloy Bath During Oxygen Top Blowing

Ryosuke Mihara, Xu Gao, Sunjoong Kim, Shigeru Ueda, Hiroyuki Shibata, Min Oh Seok, Shinya Kitamura

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Using a direct observation experimental method, the oxide formation behavior on the surface of Fe-Cr-5 mass pct C-Si alloy baths during decarburization by a top-blown Ar-O2 mixture was studied. The effects of the initial Si and Cr content of the alloy, temperature, and oxygen feed ratio on oxide formation were investigated. The results showed that, for alloys without Si, oxide particles, unstable oxide films, and stable oxide films formed sequentially. The presence of Si in the alloy changed the formation behavior of stable oxide film, and increased the crucial C content when stable oxide film started to form. Increasing the temperature, decreasing the initial Cr content, and increasing the ratio of the diluting gas decreased the critical C content at which a stable oxide film started to form. In addition, the PCO and aCr2O3 values at which oxides started to form were estimated using Hilty’s equation and the equilibrium relation to understand the formation conditions and the role of each parameter in oxide formation.

Original languageEnglish
Pages (from-to)146-158
Number of pages13
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Issue number1
Publication statusPublished - 2018 Feb 1

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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