High Temperature Oxidation of Stainless Steels

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  • 数種の不銹鋼の高温酸化
  • スウシュ ノ フシュウコウ ノ コウオン サンカ

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High temperature oxidation of four kinds of stainless steels at 1, 100°C in air was studied by using a gravimetric technique, X-ray diffraction and chemical analysis.<br>Gravimetric study showed that the oxidation rate of 310 steel (25% Cr, 20% Ni) was much lower than those of the other samples (17-18% Cr, 8-15% Ni). Differences in the oxide structure and chemical composition between the adhered scale and the exfoliated scale which occurred by quenching from 1, 100°C, were examined by means of X-ray diffraction and chemical analysis. It was found that the spinel type oxide was rich in the adhered scale, but α-Fe2O3 was rich in the exfoliated scale.<br>Discussion was made on the layer structure of the scale with the mechanism of heat resistance of stainless steels, using the oxidation potential diagrams.

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