Painted steel material for ballast tanks with excellent paint film blistering resistance, and ballast tanks and ships using the same

摘要

PURPOSE: A steel coating material for a ballast tank with a superior coating-swelling resistance, and a ballast tank and a ship using the same is provided to decrease the speed of corrosion by forming a dense passivation coating on the surface of a substrate. CONSTITUTION: A steel coating material for a ballast tank with a superior coating-swelling resistance comprises C 0.01~0.30 weight%, Si 0.01~2.0 weight%, Mn 0.01~2.0 weight%, Al 0.005~0.10 weight%, S 0.010 weight% or less, Cu 0.01~5.0 weight%, Ni 0.01~5.0 weight%, and the rest Fe and inevitable impurities. The surface roughness of at least the part the coating steel material in which coating is laminated 15~80m.