Shipbuilding and marine engineering have extremely harsh application environments, putting forward ultra-high requirements for fastener corrosion resistance, pressure resistance, and impact resistance. Marine fasteners need to resist long-term seawater immersion, salt spray erosion, marine humid air corrosion, and wave impact vibration. They must maintain structural stability under high pressure and alternating loads, avoiding rust, fracture, and connection failure. Core industry challenges include salt spray corrosion resistance, high-pressure resistance, low temperature impact toughness, waterproof and sealing performance, and high-reliability connection requirements for marine hull and offshore equipment.