The paper contains results of fractal analysis of oxide layers formed on steels used in the power industry. The studies were carried out on elements taken from three steel grades: 13CrMo4-5 (T = 470 °C, t = 190000 h), X10CrMoVNb9-1 (T = 535 °C, t = 75000 h), 10CrMo9-10 (T = 575 °C, t = 100000 h). The oxide layer was studied at the inner and outer surface of the tube wall. The obtained results of studies have shown that the fractal analysis results are affected by operational parameters and by the type of formed oxide layers.Keywords: Oxide layers, fractal analysis, surface topography
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