熔鋼の脱酸に關する二三の研究

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(1) Direct deoxidation of molten steel by manganese was experimented, obtaining the following formula for the solubility of MnO, in which the sample had been skimmed from the molten steel with a specially designed quartz apparatus and quenched immediately in mercury, and the MnO and FeO in the steel had been analysed by the alcoholic iodine method : - Solubility of MnO (%)=1.5×10^<-4>t°-0.198. For instance about 0.05% MnO dissolves at 1650℃ and the following deoxidation equilibrium : [FeO]in steel+[Mn]⇄[Fe]+[MnO]in steel. (2) In case where silicon was added to the molten steel, an acidic SiO_2 evolves, absorbs MnO and floats off. Therefore the abovementioned equilibrium disjoins, causing the reaction to the right alone. In other words, in case of the coexistence of silicon even the small quantity of the manganese content participates in deoxidation, being effective to the elimination of SiO_2. In practice, a sample was taken with a vacuum sampling vessel from the molten steel at the deoxidation period in the acid open hearth refining, the analysis of which yield an extremely slight quantity of SiO_2 as the deoxidation product. (3) A considerable amount of Fe-Si or Si-Mn was added to about 2 kg of the molten steel with 0.2% Mn and solidified within some minutes. From the results of a number of such experiments, it was found that steels with above 0.35% Si contain below half amount of the silicate inclusion when compared with those with about 0.20% Si. Similar results were obtained in the melting test on a larger scale. (4) It is presumed therefore that, the deoxidation degree of the molten steel may be improved and the silicate inclusion of ingots may be lessened by suitably utilizing the method of adding considerable amount of silicon to the molten steel with above 0.2% Mn.
社団法人日本鉄鋼協会の論文
1942-06-25

熔鋼の脱酸に關する二三の研究

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