弧光式電氣爐鋼中の窒素並にカーバイドスラッグの脱酸性に就て

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It has been generally appreciated that the high nitrogen in electric steel is due to the active nitrogen caused by electric arc. As a result of the author's investigation, however, it was defined that the high nitrogen in electric steel is due to CaCN_2 produced in slag by the reaction between CaC_2 and nitrogen in the furnace. In other words, it is necessary concequence of carbide slag method. Judging from various properties of CaCN_2, the reaction between CaCN_2 in slag and bath is assumed as follows, CaCN_2+2{FeO MnO}→CaO+2 {Fe Mn}+CO+N_2……(1) CaCN_2+CO→CaO+2C+N_2……(2) Nitrogen liberated in this manner goes into bath. And the result of further investigations on the relation between CaC_2 and CaCN_2 in slag is summarized as follows, i) In the author's about 100 slag samples containing CaC_2, the least amount of ratio CaC_2/CaCN_2 was 0.66. Therefore, the combined carbon in slag which has, hitherto been assumed to form CaC_2 (Cf. Chemical Analysis of Iron and Steel by Lundell, Hoffman and Bright 1931 p. 601) should be divided into two parts, one into CaC_2 and the other into CaCN_2. ii) If the other conditions are equal, the more nitrogen in bath increases until tapping, the more deoxidation of bath by CaC_2 is complete. iii) If the other conditions are equal, the lower the temperature of bath becomes, the more CaCN_2 is produced in slag. (END)
社団法人日本鉄鋼協会の論文
1935-09-25