I would second the recomendation for titanium, specifically Grade 5. While it is slightly more expensive than siliconized bronze, in normal marine service it doesn't suffer from corrosion at all. At tempratures below 180F the engineering allowables say you don't even need to provide a corrosion allowance for it.
Brion is correct that to cut and weld it takes a little more work than stainless, but the major differences are pretty easy to handle. Just TIG weld it under argon like you would aluminium, and hold the gass a little longer. Frankly titanium bends fine, you just have to remember how much stronger than stainless it is. With a yield strength roughly five times 316, you need to use a lot more force for the same size part.
We actually make a lot of titanium chainplates as replacement items, and are slowly moving into OEM parts as prices have come down. I would really recommend exploring titanium.
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