熔鋼の輻射率に關する研究
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The nature of high temperature radiation from liquid steel may be utilized as a measure of refining state of the steel during melting. Main factors which determine the property of radiation are the emissive power and the wave length which depend upon the radiating substance. The authors fixed their eyes on the former and carried out several studies on the emissivity of liquid steel. In the first section, the method of measuring the emissivity of wave length 0.65μ was explained. Emissivities were obtained, as usual, by comparing the actual temperature measured by a thermocouple with the apparent temperature by an optical pyrometer. The characteristic of the present method was a newly devised Fe・W thermocouple which was of a direct immersion type and formed a hot junction through liquid steel. The heat capacity of this thermocouple was so small that the measurement might be finished in 3∿5 seconds, (Photos. 1 & 2. Fig. 2). In the second section, the influence of alloying elements on the emissivity of liquid steel was theoretically treated. The result was that the more the quantity of added alloying elements is, the higher the emissivity of liquid steel becomes, the order of activities of raising emissions being Al, Cr, Ni. (Fig. 5-6). In the third section, the abovementioned theoretical result was experimentally proved. If Si or Mn was used as an alloying element, a maximum appears in a E-curve. (Fig. 7-14). In the fourth section, it was tried to know the variation of the quantity of the elements contained in liquid steel by measuring its emissivity. The experiments showed that satisfactory agreement exists between the variation of the emissivity and that of the quantity of alloying elements. (Fig. 15-21). Finally, in the fifth section the author sought for the relationship between the changes in the emissivities and the state of refining in several steels molten in the open-hearth-furnace or in the electric arc-furnace. The chemical reaction during refining being very complicated, the obtained data could not be theoretically explained. Therefore the statistical method was applied, the conclusion being "phenomenological". The results were as follows : (Fig. 22-32). (1) In the open-hearth-furnace, the value of emissivity closely correlates with the quantity of FeO included in liquid steel. (2) In the electric arc-furnace, correlation between emissivity and FeO exists only in the final stage of reduction, but the curve of the C-content is remarkably similar to that of emissivity. (3) Generally speaking, the emissivity of alloy steels is higher than that of plain carbon steels. (4) The increase of Mn content during melting acts to raise the emissivity of liquid steel. Our conclusions were in good agreement with those of G. Naeser, K. Guthmann or C. Kreutzer who had also showed that the data of emissivity are useful in discerning the quality of the steel in connection with mechanical properties. (Fig. 33-35).
- 社団法人日本鉄鋼協会の論文
- 1941-02-25
著者
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