チルドロール用木炭銑の研究 (III) : 黒鉛の発生, ガス放出, 比熱および熱膨脹との関係
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In regard to the graphite precipitation of various species of pig iron, the author measured the specific heat and the thermal dilatation with the specimens which had been vacuum-heated for gas exhaustion, and the results of these tests were indicated as follows : 1) Gas exhaustion : The temperature of gas exhaustion from charcoal grey iron made by the Teikoku Seitetsu Co. was 200 to 300℃, and that from the Teikoku charcoal mottled iron was 1, 000 to 1, 200℃. The gas of Kamaishi grey iron was exhausted at a temperature of about 300 to 400℃, and the temperature of gas exhaustion from the electric white iron made by the Nisso Seiko Co. was not examinated by this test. 2) Anomalous specific heat of vacuum-remelted specimens : The coarse microstructure of specimens of the virginal charcoal iron turned to the fine microstructure and the anomalous specific heat of it was not presumed a principal consequence by the vacuum-remelting. In the coke pig iron, the flake graphite was changed to the eutectic graphite and the anomalous specific heat became greater. In the Nisso electric iron, however, the microstructure & the anomalous specific heat were not changed at all. 3) Thermal dilatation : In regard to the Teikoku charcoal iron, the thermal dilatation at a temperature higher than 500℃ in vacuum was much more than that in argon gas under 1 atm. Therefore, it was presumed that the graphite precipitation was more prominent in vacuum than in argon. In regard to the Nisso electric iron, the thermal dilatation of the iron at a temperature lower than 600℃ was less than that of the other species of pig iron in both of vacuum & the argon under the pressure of 1 atm. At a temperature of about 800℃, the thermal dilatation in vacuum was more remarkable than that in the argon under the pressure of 1 atm.
- 社団法人日本鉄鋼協会の論文
- 1958-02-01
著者
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