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The study of the chemical reaction rate at the gas–metal interface has seen much progress in the last few decades. Surface active elements, such as sulfur and oxygen, significantly affect the metal–gas interface by reducing the surface reaction rate of nitrogen. Ban-ya et al. investigated this phenomenon by performing 500-g-scale laboratory tests using the argon blowing method under normal pressure.1) Harashima et al. examined this effect in the high-purity range of steel using a 12-kg vacuum induction furnace.2) In addition, the effect of surface active elements in highchromium steel has been reported by Kiyose et al.3) These studies quantitatively gave the chemical reaction rate coefficient because the equation includes the adsorption parameters of sulfur and oxygen. Takahashi et al. carried out experiments to estimate the nitrogen removal reaction rate through argon bubbles under normal pressure, and nitrogen showed a similar effect to surface active elements, not only at the surface but also at the inner surface of the injected argon bubbles.4,5) In addition, the removal rate of nitrogen with argon injection under reduced pressure has been investigated.6,7) According to the results of these studies, the interfacial area and mass transfer rate significantly increase Kinetic Study of the Nitrogen Removal Rate from Molten Steel (Normal Steel and 17 mass%Cr Steel) under CO Boiling or Argon Gas Injection