The effects of induction hardening on mechanical properties of two kinds of carbon steel (0.59%C , 0.35%C) that are widely used in local industry, were discussed by exposed specimens that were induction hardened with different values of power and inductor's speed to hardness, tensile, and impact tests. The results of tests showed that the mechanical properties become greater with slight decrease in impact energy of carbon steel when induction hardening is used, and showed the possibility to do control on product's properties by make control on treatment parameters .