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In direct reduced iron (DRI) process, natural gas is used as reducing agent to produce iron while in blast furnace the main reductant is coke.1,2) DRI, as virgin metal, is mainly charged into EAF process for dilution of tramp elements, such as Ni, Cr, Mo, Cu and Sn in steel. The amount of DRI production has been increased significantly from 0.79 Mt/ year in 1 970 to 68.4 Mt/year in 2008.1–3) Low equipment cost and high elasticity of production is strong advantage of DRI as one of the promising iron making methods.4,5) Currently, MIDREX is the predominant process for using natural gas. In reformer of the MIDREX, CH4 and CO2 from reduction furnace are utilized to produce CO and H2 as reducing gases. Natural gas reforms over 1 273 K in the presence of a catalyst such as Ni. The obtained gases, CO and H2, heat up to around 1 273 K and flow into the reduction furnace again. The reduction reactions are as follows;

Effect of H<sub>2</sub> Concentration on Carbon Deposition Reaction by CO–H<sub>2</sub> Gas Mixture at 773 K to 973 K