Which high performance stainless steel is commonly used for propeller shafting?

Aquamet 22 is the correct answer because it is specifically designed for marine applications where resistance to corrosion and strength are critical. This high-performance stainless steel alloy is known for its excellent resistance to a variety of corrosive environments, particularly in saltwater. Its composition includes a higher nickel and chromium content which enhances its overall durability and resistance to pitting and crevice corrosion, making it an ideal choice for propeller shafting in marine contexts.

While Nitronic 50 is also a high-performance stainless steel, it is primarily utilized in applications requiring high strength and wear resistance rather than specifically for propeller shafts. Aquamet 17 is suitable for certain marine applications but doesn't offer the same level of performance and corrosion resistance as Aquamet 22. Monel, a nickel-copper alloy, is resistant to corrosion but lacks the specific properties needed for propeller shafting compared to Aquamet 22. Thus, Aquamet 22 stands out as the best choice for its tailored characteristics suited for the demanding marine environment.