The corrosion resistance of duplex stainless steel is superior to many other materials used in marine engineering. Compared to austenitic stainless steels, duplex stainless steel has better resistance to stress corrosion cracking and chloride-induced corrosion. Compared to carbon steels and low-alloy steels, duplex stainless steel has much better corrosion resistance and is less susceptible to pitting and crevice corrosion.

In addition, duplex stainless steel has good resistance to a wide range of corrosive media found in marine environments, including seawater, brine, and acidic solutions. This is due to its high chromium and molybdenum content, which provide excellent corrosion resistance and resistance to localized corrosion.

Overall, duplex stainless steel is a popular choice for marine engineering applications due to its excellent corrosion resistance, high strength, and good weldability. It is a cost-effective alternative to other high-performance alloys and performs well in the harsh marine environment. However, the specific type and grade of duplex stainless steel selected must be carefully chosen based on the specific application requirements and environmental conditions to ensure optimal performance.