鹽基性平爐及び鹽基性弧光爐に於ける窒素の性状に就て

概要

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According to the research of the behaviour of nitrogen in the basic open hearth furnace and the basic electric arc furnace, the following results were developed : (1) The definite decrease in the nitrogen content of the molten steel during melting in a basic open hearth furnace is visible after the occurrence of the increase in the oxygen content of the molten steel that has not finished melting. A simple mechanical boiling would not decrease the nitrogen content of the molten steel. (2) In a rimmed steel, the nitrogen causes an ingot segregation as in carbon, phosphorus, etc., but in somewhat less degree. (3) In the basic electric arc furnace, the nitrogen content of the molten steel is already remarkable at the moment of melting down. It is due to the existence of a period when the steel bath has not been fully covered by the slag. Therefore, the nitrogen absorption of the molten steel during melting may be suppressed by adding slag-formers such as lime and fluospar to the furnace bed before charging the steel scraps and thus covering the bath with slags from the primary stage of melting. (4) In the electric arc furnace, the more free carbon (cokes) exists the greater is the amount of CaC_2 found in the slag of the reducing period, while the nitrogen increases with the CaC_2. No relation is found between the nitrogen in the slag and that of the molten steel.
社団法人日本鉄鋼協会の論文
1941-08-25