Stability of cementite under CO-CO2-H2 gas mixture at 1 200 K

Takahiro Miki, Yusuke Fujita

Research output: Contribution to journalArticlepeer-review


Suppression of CO 2 discharged from iron and steelmaking companies is an example of the biggest issues for the protection of global environment and sustainable growth of steelmaking industry. One of the efforts made to decrease the emission of CO2 in ironmaking process is blowing of hydrogen gas into blast furnace. Hydrogen gas can reduce iron oxide and form harmless H2O. Cementite (Fe3C) may be formed by introduction of hydrogen into blast furnace and play an important role on carburization and smelting behavior of reduced iron. In the present work, Fe3C sample was held at 1 200 K under various CO-CO2-H2 gas mixtures to clarify the stability of Fe3C phase. It was confirmed that metastable Fe3C phase will decompose into Fe and C, and FeO will form under high CO2 partial pressure. Also, it was found that existence of H2 will suppress decomposition of Fe3C. It was confirmed that CO 2 gas will be continuously converted into CO by C formed by decomposition of Fe3C.

Original languageEnglish
Pages (from-to)409-412
Number of pages4
JournalIsij International
Issue number2
Publication statusPublished - 2015


  • Cementite
  • Decomposition
  • Oxidation
  • Reaction
  • Stability

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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