The 2205 duplex stainless steel offshore wind monopile foundation flange bolt is a critical fastener for flange connections between the monopile foundation and tower sections. It typically adopts a heavy hex head or flange head with precision external threads, used together with matching nuts and washers of the same material. The bolt withstands alternating loads, tensile loads and bending moments during turbine operation, requiring high yield strength, fatigue resistance and long-term corrosion resistance. With an austenite-ferrite duplex microstructure, 2205 steel offers higher strength than 304 and 316L, plus excellent resistance to chloride pitting, crevice corrosion and stress corrosion cracking, making it suitable for high-salt-spray, humid and heavy-load offshore wind conditions.

Offshore wind monopile foundation flange connections, tower section connections, nacelle base connections, heavy flange connections on offshore platforms, port engineering machinery, and heavy-load connections in bridge steel structures.

1. Heavy flange head with large bearing area for uniform stress and high-torque assembly;
2. Long threaded shank provides sufficient preload stroke for flange sealing and load distribution;
3. High-strength 2205 duplex steel with good fatigue resistance for long-term turbine cyclic loads;
4. Seawater and salt-spray corrosion resistance reduces maintenance and replacement costs offshore;
5. Available with matching nuts and washers of the same material to avoid galvanic corrosion.