リムド鋼およびキャップド鋼塊の非金属介在物について

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タイトル別名
  • On the Non-Metallic Inclusions of Rimmed and Capped Steel Ingot
  • リムド コウ オヨビ キャップド コウカイ ノ ヒキンゾク カイザイブツ ニ ツイテ

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The distribution and the constitution of non-metallic inclusions in every solidification zone of rimmed and capped steel ingots were investigated and the etiology of flake-type FeS inclusions, which exist in the highest segregation zone of rimmed steel ingots and large oxide inclusions which exist in the bottom part of both ingots was discussed. The conclusions were as follows. (1) The distribution of sulphides was in compliance with the S-print of ingot, its quantity decreasing gradually in the equiaxed, the large columnar crystal and the rim zones. (2) Large oxide inclusions extracted by the Slime method was found enriched in the bottom center and its quantity in capped steel was larger than in rimmed steel ingot. (3) The large sulphides, of flake type and mainly consisting of FeS, existed in the highest segregation part of equiaxed crystal zone of rimmed steel ingots and MnS-MnO inclusion existed in other parts in that zone. In bottom zone were found much silicates and large silicates containing Al2O3. In the rim zone there was little inclusion. (4) MnS-MnO and MnS MnO-Mn·silicate existed in the segregation part of equiaxed crystal zone of capped steel while in the other parts only MnO-MnS-Mn·silicate, existed. In large columnar zone there was mainly Mn·silicate and in the bottom side in that zone we found large silicates containing Al2O3. In the rim zone little inclusion could be found and only Mn·silicates containing Al2O3 were found.

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