Resistant? Yes and no. It depends on the SS grade (18-8,304, 316, etc) but typically screws are of lower grade SS and are susceptible to attack by chloride. If they are being used in direct contact with the water they'll definitely pit. If they are just in the cabinet, they'll be fine for a while but will corrode with time, especially if they are in contact with a dissimilar metal (leading to galvanic corrosion). To be truly corrosion-resistant you'd need Bumax 88 or A286 Stainless steel. Really you should be fine if you have them, but there are better, cheaper options.
Brass, titanium, or silicon bronze are fairly corrosion resistant but are not the cheapest or easiest to find. In my opinion, the absolute best are Amour Coat alloy steel screws. They have a plastic like spray finish to them that is spec'ed to give over 1000 hours of salt spray resistance (direct spray from seawater) and are usually high grade steel (grade 8). And the best part is they are reasonably cheap. Easiest place to find any of these is through Acklands Granger in town but if you call around you'll find a lot of places have them.
What are you using them for?
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