Although it is required hardness for coke in the blast furnace, CO
2 is generated by reduction of iron ore and the CO
2 gasify coke and make coke brittle. However, there is a case where the strength does not easily lowered. One of the reasons is difference of coke optical textures. So, there are many studies about influence of gasification on coke optical textures. However, almost of these reasearches are about CO
2 gasification and there is a little about CO
2/H
2O mixed gas. In this study, since H
2 rich gas is used for reducing gas and CO
2/H
2O gasification is occured in NEDO project COURSE50, influence of CO
2, H
2O, CO
2/H
2O gasification on coke optical textures was investigated by using image analysis of the coke cross-section. As a result, it was revealed that inert and isotropic textures had higher reactivity and ratio of inert, isotropic and mosaic textures reactivity was 1.00:0.71:0.20. This ratio was almost same in all gas.
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