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The nanostructured surface layers were fabricated on a thermal refining chrome-silicon alloy steel and a hypoeutectoid medium carbon steel by mean of Supersonic Fine Particles Bombarding (SFPB) based on robot system.The microstructure features in the treated surface layer were characterized using X-ray diffraction (XRD),scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations.Experimental results show,after SFPB treatment,the severe plastic deformation is observed and the nanostructured surface layer is found for both samples.The microstructure of the top surface is characterized by uniformly distributed nano-scale grains with equiaxed shape and random crystallographic orientations.