| 摘要 |
PURPOSE:To eliminate a separate stage for removing processing oil sticking to a product to be treated by feeding only an oxidizing gas into a carburizing furnace while the oil remains in the furnace and by feeding gaseous hydrocarbon and the oxidizing gas. CONSTITUTION:A product to be treated is put in a carburizing furnace and only air as an oxidizing gas is fed into the furnace while cutting oil or the like sticking to the product remains in the furnace. The oil is thermally decomposed to produce CO or CO2 and the amt. of deposited carbon can be reduced by continuing the feed of the oxidizing gas. After the concn. of CO2 is measured and a state in which carburization is smoothly carried out is confirmed, gaseous hydrocarbon and the oxidizing gas are fed into the furnace to carburize the product.
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