What is said to be the biggest weakness of steel for building ships?

The biggest weakness of steel for building ships is its susceptibility to corrosion, especially when exposed to seawater. This can lead to structural degradation over time, requiring regular maintenance and protective coatings to prolong its lifespan. Additionally, steel can become brittle at low temperatures, which poses risks in icy conditions. These factors necessitate careful design and engineering considerations in shipbuilding.