Abstract
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.
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.
Discussion was made on the layer structure of the scale with the mechanism of heat resistance of stainless steels, using the oxidation potential diagrams.
