The presented paper contains the results of research on fractal analysis. The fractal analysis was carried out on X39Cr13 steel subjected to heat, surface and thermo-chemical treatments. The research was carried out according to various variants: hardening + tempering (H/T), hardening + tempering + surface treatment (H/T/N, hardening + tempering + surface treatment + sterilization (H/T/N/S), hardening + tempering + sterilization + corrosion resistance test (H/T/S/C, hardening + tempering + surface treatment + sterilization + corrosion resistance test (H/T/N/S/C). Spatial characteristics of the surface texture of steel samples were derived from SEM images.Keywords: X39Cr13 steel, fractal analysis, surface topography
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