Abstract
The results related to oxidation of ST55, LH15 and AREMA steel cylinders exposed to high temperatures in ambient air are reported. The oxidation temperatures are in the range from 940 to 1100 °C and the exposition time period, t, in the range from 0 to 500 h. It is shown that the steel oxidation can be well described by gas-filling cylindrical model. The classical Paidassi's model and saturation model are remembered. The obtained results are discussed from the point of view of steel compositions.

Key words
high temperatures, oxidation, steels, ambient air, influence of chemical composition

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