When navigating in polar ice regions, ships are subject simultaneously to both ice friction and seawater corrosion. However, the interaction behavior between wear and corrosion of shipbuilding steels remains unclear. In this study, the corrosion-wear behavior in seawater of three types of shipbuilding steels, EH40, FH40, and 921A was studied via mechanical-electrochemical approach. The results indicate that the three shipbuilding steels all suffered from abrasive wear, while different clusters composed of abrasive dusts and corrosion products co-exist on the worn surfaces. Among them, 921A demonstrated the best wear and corrosion resistance due to its high hardness and stable martensitic structure, followed by FH40, while the EH40 exhibiting the poorest performance. Although the volume loss directly caused by corrosion accounts for a relatively small proportion of the total volume loss, corrosion can significantly accelerate the wear of steel. For FH40 and EH40, the total corrosion wear is dominated by the portion of pure mechanical friction, and the corrosion induced wear increments accounts for 18.5% and 32.8%, respectively. In contrast, the corrosion induced wear increment for 921A was twice the proportion of pure mechanical friction, indicating a marked corrosion acceleration effect on mechanical wear.