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I am assuming a Metric Socket Head, so it is DIN 12.9, equivalent to Grade 8, with a Yield around 170Ksi, versus 18-8 SS, which is around 70Ksi. Would not be a good idea to substitute as it is a single point of failure. There are a wide range of Zinc coated metric Socket heads DIN12.9 available from Mcmaster which will hold up much better and also be less likely to gall due to the coating. They are quite cheap on McMaster. The Zinc Flake and Zinc Aluminum coatings are designed to withstand salt spray specifically.
There are high strength SS alloys with yields near 170KSi such as 17-4PH, Bumax and A286, but they are not readily available in Metric threads in the US. If the screw is an M5, a 10-32 can substitute, but otherwise your out of luck.
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