Jolene said..
There are also several different alloys of stainless steel that are more resistant to pitting , crevice corrosion and have better tensile attributes than the common 316 grade .
I am looking at boats from the 70s and 80s so it is hard to know what SS they used. On the other hand, in those days, bronze was generally good quality. I have seen a bronze prop shaft on a 100+ year old shipwreck, sparkling in the sunlight.
