自轉車部分品に於けるガス滲炭窒化法の工業化に就いて

概要

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Free wheels of bicycle parts were carburized by solid or liquid carburizing. To rationalize the operation, the gas carbonitriding for the bicycle parts was studied by using the town gas alone and practised it in the plant of Shimano Industrial Co. In carburizing, the hydrocarbon was added to the carrier gas made by cracking the town gas at 930℃. In carbonitriding the hydrocarbon and the ammonia gas were added to the carrier gas. The composition of the carrier gas was 0.8% CO_2, 0.2% O_2 16.1% CO, 12.7% CH_4 and 45.3% H_2. The results obtained were summarized as follows : 1) The carburizing temperature was 900℃ and the holding time at the temperature was 1.5hr. The added hydrocarbon was 2.5cc/min and the flow of the carrier was 50 L/min. The carburized layer 0.7mm thick was obtained and the hardness of the work was HRc 59 after a direct oil quenching. 2) The carbonitriding temperature was 820℃ and the holding time at the temperature was 2 hours. Added hydrocarbon was 1.5cc./min and the ammonia gas was added 7 L/min. The carburized layer 0.4mm thick and the compound layer 0.15mm thick were obtained. The hardness of the work was HRa 81 after a direct oil quenching.
社団法人日本鉄鋼協会の論文
1954-02-25