鐵鋼中の Al_2O_3 及 SiO_2 に就て : 鐵鋼中の非金屬介在物の研究(第 1 報)

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The determination of Al_2O_3 and SiO_2 in special steel is difficult by usual iodin method, electric decomposition method and nitric or hydrochrolic acid method, because the decomposition of carbides is incomplete. The author studied the solubility of Al_2O_3 or SiO_2 in various acids, and indicates the next analytical method is the most proper : treat the sample (about 100_g) with hot 1 : 3 HNO_3 and from that residues determin SiO_2 by usual HF+H_2SO_4 method and Al_2O_3 by oxine method. Utilizing these methods, he examiued the values of SiO_2, Al_2O_3, H_2 (by hot extraction method), O_2(by hydrogen reduction method), N_2(by distillation method) in basic arc furnace steels and acidic or basic open hearth steels, and indicated that SiO_2 or Al_2O_3 is variable by the deoxidizing method. Furthermore he studied the variation of quantity of C, Mn, H_2, N_2, O_2, SiO_2, Al_2O_3, in steel bath and c. C, N, H_2O, CaO, in slag, in the course of steel making process of basic arc furnace and indicated that (1) the variation of H in steel bath is parallel to H_2O in slag, (2) the quantity of Al_2O_3 in steel increased rapidly after aluminium is introduced.
社団法人日本鉄鋼協会の論文
1940-01-25