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The service life of 316L stainless steel in marine environments is closely related to the specific application scenarios, with significant variations. Under proper installation and use, it can last 30–70 years in typical coastal environments. The following are details for different scenarios: In coastal areas with salt mist or atmospheric exposure (such as building railings and coastal pipelines), when proper passivation is applied and installation is carried out according to standard procedures, qualified 316L stainless steel can last 50–70 years, sometimes even as long as the building itself. No frequent maintenance or replacement is required during this period. Engineering projects in Qinxieming show that 316L stainless steel pipes used in coastal areas fall within this range of service life. Splashing/tidal areas (partially submerged in seawater). The corrosion rate in such environments is higher than that in atmospheric conditions; properly passivated 316L stainless steel can last around 15–30 years. Without any surface protection measures, its lifespan is reduced to 10–15 years, and pitting corrosion tends to occur sooner. Full immersion in seawater (long-term exposure to seawater): Ordinary 316L steel reaches its practical limits in such conditions; its service life is generally between 5 and 15 years. Gap corrosion tends to occur more easily at the joints in the structure. There are records of 316L buckles showing severe corrosion at the gaps after just 2 months of exposure to seawater. Key factors affecting lifespan: Surface treatment – Acid washing and passivation, as well as electro-polishing, can significantly extend lifespan and reduce the likelihood of pitting ； Structural design: Try to avoid gap structures (such as bolted connections or cable attachments), as gaps can trap chloride ions and lead to corrosion ； Chloride ion concentration: In coastal areas with high salinity and high pollution, the corrosion rate is faster than in open seas, resulting in a shorter service life.