鉄鋼におよぼすCaの影響　細粒化および清浄化作用について

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  • On the Cleanliness and Austenite-Grain Size of Plain Carbon Steel (Effect of Calcium on Iron and Steel Making)
  • テッコウ ニ オヨボス Ca ノ エイキョウ サイリュウカ オヨビ セイジョウカ サヨウ ニ ツイテ

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In the study of manufacturing calcium-killed steel, an iron-calcium base alloy was employed for producing a clean fine-grained steel which contained no such dirty inclusions as in the ordinary aluminum-killed steel. Steel containing 0.3∼0.8%C were melted in 4 charges in a magnesia-lined high frequency induction furnace having a 30 kg capacity. Each steel specimen was prepared from electrolytic iron and gas carbon. After deoxidizing at 1630°C with 0.5% of ferro-manganese, 0.3% of metallic silicon and 0.05% of aluminum, the melt was divided into three parts, each part being treated with different amount of the iron-calcium base alloy and cast into a CO2 sand mould of keel block type or an iron mould. The results of this experiment are summarized as follows: Such alloy addition was effective in reducing the amount of inclusion types A and B, and especially the inclusion type B was almost entirely eliminated. The alloy addition also improved the grain size of the steel. The refining of the grain size may be possibly attributed to the presence of aluminum nitride which was formed from the reaction of the aluminum reduced by the alloy with some of the nitrogen dissolved in the molten steel. This was proved by the fact that the amount of aluminum nitride was larger in the steels treated with the iron-calcium base alloy than in the untreated steels and at the same time the amount of oxides including alumina became smaller in the former than in the latter under the same conditions of melting.

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