1993 Volume 79 Issue 5 Pages 597-603
Oxide scale properties on reheating slabs were studied from the point of steel compositions and oxidation conditions. The gas atmosphere was simulated to combustion gas of butane. Increase in scale thickness, the apparent porosity and the mean pore diameter in scale under the influence of oxidation temperature and time were investigated. The main results are summarized as follows. Si in steel had an important effect upon the behavior of scale formation of Fe2SiO4 between the iron substrate and the scale. When Si content in steel is more than 0.2%, the oxidation slowed down below 1170°C, which is the eutectic temperature of FeO and Fe2SiO4. Above 1170°C, scaling became heavy and the pores in scale became large by their agglomeration. C in steel resulted in a greater pore formation because of CO gas formation on oxidation. Mn in steel dissolved in scale uniformly but had a minor effect on the scale properties.
