is usually made from Nitronic 50, not any of the 300 series of s/s. This is good stuff, virtually immune to crevice corrosion
and stress cycle corrosion
and bloddy strong. But, I don't know if it is weldable.
For Greg, rod usually fails at or near the heads on the ends of the rods. It is possible that someone with a smaller boat could use your old rods, cut down and reheaded (reheading is a common service
and not too dear).
I know that if I lived ashore and had a shed and was in your place, I couldn't possibly throw such good stuff away!!