In order to economize on raw materials for producing controlled atmospheres and to avoid the air pollution caused by exhausted atmospheres, the feasibility of carburizing steel by using recirculated water-gas atmospheres was investigated. Water-gas was generated in a closed system and an open system respectively, and steel samples were heated under the water-gas atmospheres. Based on the heating results of steel, the relationship between the generation conditions of water-gas and its carburizing behavior was examined. In addition, the carburizing results as well as the charcoal consumption for both systems are compared with each other.
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