炭素螺旋式眞空熔融爐による鋼中の Al_2O_3 及び Cr_2O_3 の酸素定量について

概要

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There are many cases that steel contains such high melting point oxides as Al_2O_3 or Cr_2O_3, and to determine exactly the oxygen content in steel, it is necessary to ascertain that oxygen from these oxides is to be satisfactory extracted or not by vacuum fusion method. However, to ascertain this, it is thought that the extracting temperature have to be rised to their melting point. So the authers tried to improve a carbon-spiral furnace to be able to rise the degassing temperature to 2300℃. As the results of our improvement, it became possible to examine the extraction of oxygen from above mentioned oxides at their melting point, and besides at previous extracting temperature (1600°∿1700℃), it became possible to shorten the degassing time and to decrease the blank value. But it became clear that, it is impossible to obtain a complete extraction of oxygen from the pure Al_2O_3 and Cr_2O_3 powder by vacuum fusion method. It seems possible to obtain a complete extraction of oxygen included in steel samples as Al_2O_3.
社団法人日本鉄鋼協会の論文
1950-03-25