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Hi,
Although I have heard of some attempts at producing alternative rod alloys, including titanium, I don't know of any that have borne fruit. Some alloys -- notably that duplex stainless you mentioned -- do not take well to heading. Others are too trick to extrude, or fatigue too fast. And while I don't have data here showing relative corrosion resistance, Nitronic is near the top in this category, as well as posessing superior strength, etc. So while we can always hope that something even better will come along, I wouldn't hold your breath. If you really want something that performs better, look into extruded Kevlar and the like.
Fair leads,
Brion Toss
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