In this study, the mechanical structure carbon steel (SM45C) was heat-treated, and the wear and immersion characteristics were evaluated. The coefficient of friction and wear loss were proportional. The wear surface of 9.8 N wear load showed plowing due to abrasive wear. The wear surface of the 24.5 N wear load exhibited adhesion wear resulting in plowing and flakes. The wear surface showed different wear phenomena depending on the magnitude of the wear load. Corrosion occurred mostly in the acid solution, but hardly occurred in the alkali solution.