The durability of stainless steels can vary depending on the amount of chromium they contain and the composition of other alloys. In particular, the 300 series (e.g., 316 stainless steel) is highly resistant to seawater and is often used in marine applications. These steels are preferred in various maritime fields such as shipbuilding, maritime equipment, underwater structures, and underwater materials.

However, the quality of steels and their durability can vary depending on factors such as usage conditions and the chemical composition of seawater. Therefore, it is important to consult with an engineer or materials expert to determine which steel is suitable for a specific application.