製鋼過程に於ける非金屬介在物の定量法及除去法 (I) : 非金屬介在物定量法の研究

概要

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Various chemical methods for the determination of non-metallic inclusions in metal were re'examined. Among various residuel analyses, above all the nitric acid method was recognized as the most suitable one. In molten steel including silicon, the reaction, FeO+Si→SiO_2, occurs during solidification and new inclusion appears in addition to the true inclusion. Therefore the quantity of inclusions depends on the verocity of solidification, that is, on the size of ingot mould. In case of no silicon bath, it is almost equal independent of solidifying velocity. Therefore a special vacuum samspling apparatus is required for the purpose of measuring true inclusion in molten steel, but it is inconvenient for ordinary use. For that reason a small iron ingot mould-its size was determind, considering to check the segregation of inclusions-was adopted in order to make the condition of-solidification constant. If the standard sample is forged before analysis, the value of inclusion will be higher. The inclusions that increase by forging are SiO_2 and Al_2O_3. FeO and MnO rather usually decrease a little.
社団法人日本鉄鋼協会の論文
1949-11-25