日本金属学会誌

J. Japan Inst. Metals, Vol. 14, No. 3 (1950),
pp. 30-33

On the Decarburization of Iron and Steel (1st Report)

Masuo Kawakami and Mayumi Someno


Abstract:

For use in vacuum tubes,commercial pure iron has a defect of evlving gas more than nickel. Since the source of the gas evalvement is said to be chiefly the unevitable existance of the carbon in commercial pure iron,we tried of to eliminate the carbon in com mercial pure iron.
At first,we investigated the decarburization of plain carbon steel in hydrogen especially paying attention on the rate of reaction on its surface. The sheets of about 1 mm thick of carbon steel were decarburized at 900°, 950° and 1000° in dry hydrogen and wet one saturated with water vapor at-180° to 20°. The rate of decarburization was expressed by a quantity of ``decarburization ratio'' defined as ``decrease of carbon divided by total carbon in a sample''.
There ratio was ascertained to be independent of carbon content in a sample and also to increase with content of water vapar in hydrogen flow. We found that it is convenient to consider the rate of reaction between decarburizing agent and carbon atom in austenite to explain the dependence of the ratio to thickness of samples,water vapor pressures in hydrogen, and also the changes of carbon distributions in samples.


(Received 1949/7/27)

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