Grades 304 and 316 stainless steel are the most commonly used in marine settings, with 316 particularly renowned for its high corrosion resistance in aggressive marine environments. Stainless steel forms a protective oxide layer on its surface, which acts as a barrier against corrosion, even when exposed to salt water. This oxide layer is self-repairing and continues to protect the material over time. When properly maintained, stainless steel tubing can have a long lifespan in marine environments, often exceeding the lifespan of alternative materials.