鐵鋼の材質に及ぼす酸素の影響 (I)
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概要
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If the carbon content in a molten steel bath is constant, also the oxygen content should be constant, as viewed from the stand point of carbon-oxygen equilibrium. In the practical steel making process, however, the oxygen content in the bath is not always equilibrium to the carbon content, but it is rather higher than the equilibrium value. That is, steels always contain different oxygen value according to the various conditions of carbon-oxygen reaction. There are many problems how and why these differences in oxygen content influence on the properties of iron and steel. In order to study this influences, the author prepared steel samples which contain contant carbon and various oxygen in laboratory furnaces, and then, by using these samples, investigated their grain size and hardenability. Results obtained are as follows ; 1) In the pure carbon steels containing little oxygen and much oxygen have greater tendency to form grain growth than that of containing medium quantity of oxygen. 2) In the pure carbon steels containing much oxygen, abnormal structures are apt to appear in the carburized samples. 3) The pure carbon s eels containing much oxygen have distinctly lower hardenability than that containing little oxygen. 4) It is said that steel with coarse and uniform grains has good hardenability, but even in steel with fine and ununiform grains, if it contains little oxygen, the hardenability of it is much improved. However, it is not yet clarified that whether these results depend upon only the effect of oxygen content or not. Anyhow, in the practical steel making process, it is clear that the refining operation has to be performed standing on the base of preventing oxidation of the molten steel bath.
- 社団法人日本鉄鋼協会の論文
- 1950-03-25