熔解用るつぼ, インゴチズムおよび添加元素の歩留について : 純鉄およびステンレス鋼の真空熔解に関する基礎的研究 I

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The present investigation was performed for the purpose of obtaining the fundamental knowledge of the vacuum-melting practice on crucibles, stamping refractories, erosion of crucibles, ingotism etc. Furthermore, the change of the contents of gases and metallic constituents in pure iron during vacuum-melting, and the recovery of added elements in stainless steels were also investigated. The results obtained were as follows : 1) Pure iron was melted and held in vacuum in the four kinds of electro-magnesia crucibles, and the changes of content of various elements were plotted against the holding time. It was proved that within 1h. all of the crucibles tested were comfortable. Crucible B'-1 was most excellent and the oxygen contamination was not observed within 2h. at 1600℃, but the content of oxygen was increased when the melt was kept at 1700℃ for 30mn. 2) The results of the refining method of pure iron melts by hydrogen gas showed the higher content of hydrogen. 3) The content of oxygen was sufficiently decreased by immersion of the graphite rod into the melt, but the content of carbon was increased rapidly. It was thought, therefore, that the control of the content of dissolved carbon was very difficult. 4) By the appropriate modification of the mold design, the ingotism could be improved. 5) Stainless steels were satisfactorily vacuum-melted by the method in which the addition of silicon and manganese were carried out under the pressure of 20mmHg of argon to prevent from their vaporization loss.
社団法人日本鉄鋼協会の論文
1959-12-01

熔解用るつぼ, インゴチズムおよび添加元素の歩留について : 純鉄およびステンレス鋼の真空熔解に関する基礎的研究 I

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