酸性製鋼法に於ける珪素の還元に就て(第 1 報)
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概要
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From the amount of silicon reduced into steel in the process of making it in an acid furnace, it can be ascertained whether the ferrous oxide content in the molten steel is large or small. In other words, the reduction of silicon in the steel making, indicates whether the steel is spontaneously deoxidized or not. Furthermore, in making steel in an acid open hearth furnace, if the amount of the reduced silicon in the molton steel is excessively large, the ferrous oxide content in the molten steel is likely very little. In such a case, the molten steel readily absorbs hydrogen from the furnace gas in no small amount, thereby causing flakes in the steel product. It is clear, therefore, that the reduction of silicon in the steel making has an important bearing upon the quality of the steel made. The writer has made some investigations about the influences of the melting temperature of steel and of the chemical composition of slag upon the reduction of silicon by making use of an acid high-frequency furnace, and the principal results obtained may be summarized as follows : 1. When the melting temperature is low, the carbon in the molten steel is oxidized chiefly by the oxygen in air. As the temperature rises, however, the portion of carbon consumed for the reduction of silicon increases. 2. The speed at which silicon is reduced, increases as the rise of melting temperature. 3. No influence of slag composition upon the reduction of silicon is noticeable. This fact may be attributed to the small amount of slag used as compared with that of steel melted. 4. The influence of the number of the uses of lining upon the reduction of silicon was manifestly evident ; as the number increased, the reducing speed of silicon decreased somewhat rapidly at the begining, and then slowly until finally it reached an asymptotic value. 5. Test plates cut from the ingots produced and also from the billets forged therefrom and air cooled, were fractured. No flakes could be found in any of the test plates even when it contained reduced silicon as much as 1.10 per cent. We may, therefore, safely say that the fact that more flakes appear in acid open hearth steel which contains a large amount of reduced silicon, is not because the silicon itself is injurious, but because the furnace condition which makes so much silicon to be reduced, is harmful.
- 社団法人日本鉄鋼協会の論文
- 1938-09-25