Effects of hydrogen and nitrogen gas mixture on nitrogen absorption rate in low carbon steel melt

Seiji Nabeshima, Hisashi Ogawa, Yuji Miki

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


To clarify the effects of blowing a H2-N2 mixture onto the surface of molten steel containing various oxygen contents on the absorption reaction of nitrogen in the molten steel, experimental studies were carried out using a 20 kg induction furnace. Blowing of the H2-N2 mixture accelerates the nitrogen absorption rate because the oxygen concentration at the gas-metal interface is decreased by the reducing effect of the hydrogen gas. The apparent chemical reaction rate of nitrogen absorption in the present work was evaluated at almost the same reaction rate as that of desorption of nitrogen in previous works. Furthermore, a mathematical model for the nitrogen absorption and desorption reactions in a RH degasser was developed in order to estimate the contribution of each nitrogen reaction site during decarburization and killing treatment with injection of pure N2 gas or the H2-N2 mixture in the molten steel. Using the mathematical model, it was estimated that a larger increase in the nitrogen concentration during decarburization treatment could be achieved by applying a 30% H2-N2 mixture to the injection gas in the RH degasser than by applying pure N2 gas.

Original languageEnglish
Pages (from-to)627-635
Number of pages9
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Issue number12
Publication statusPublished - 2015
Externally publishedYes


  • Gas-metal reaction
  • Hydrogen
  • Ladle metallurgy
  • Mathematical model
  • Nitrogen absorption
  • Oxygen
  • Secondary steelmaking
  • Vacuum degasser

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry


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