The effect of shot peening on surface integrity was described. After shot peening was performed for carbon steel under several conditions with steel shot, peened materials were heat-treated at various temperatures and times (100~600℃, 15~240 min), and then hardness, half width and surface residual stress were measured. The following results are obtained: (1) non-affected layer induces compressive residual stresses on the peened surface and surface layer, (2) hardness increases after heating at 200~400℃, but decreases in case of 600℃, (3) compressive residual stresses decrease after all heat treatments, (4) microstructure may be recovered by heat treatment at low temperature
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