固体鉄と共存する MnO, SiO_2 および Cr_2O_3 の還元性雰囲気加熱における挙動(製鋼)

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In the previous studies concerning the behavior of oxide inclusions in steels in the hot-rolling process, the steel specimens were made by the method of powder matallurgy : that is, the iron powder was mixed uniformly with a certain amount of synthetic oxide inclusions, shaped by pressing, and sintered in H_2 atmosphere. It was found that a part of mixed oxide inclusions disappeared by reduction. This phenomenon suggested that a part of the synthetic oxide inclusions was reduced by H_2, and the metallic elements produced by the reduction were then dissolved in solid iron. Consequently, the activity of those elements was lowered, and the reducibility of oxides increased considerably. The present investigation was carried out in order to make the behavior of oxides in steels clearer and know more about the reduction. The specimens made of the iron powder containing a certain amount of MnO, SiO_2 or Cr_2O_3 respectively were held at the constant temperature of 800℃ to 1100℃ and in the H_2-H_2O gas under the constant P_<H_2O>/P_H_2 ratio. When the equilibrium state was attained, the change of weight of these specimens due to the reduction of oxides was measured by thermo-balance, and the reducibility of the oxides at each temperature was investigated. Furthermore, the activity and the activity coefficient of the Mn, Si and Cr elements in solid Fe-base alloys were calculated by combining the experimental value of Mn, Si and Cr concentrations and the thermochemical data concerning the reduction of the oxides.
社団法人日本鉄鋼協会の論文
1968-03-01

固体鉄と共存する MnO, SiO_2 および Cr_2O_3 の還元性雰囲気加熱における挙動(製鋼)

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