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As Norseman recently discovered, duplex steels do not like being formed: cracking results. And people have, of course, considered titanium, but so far the cost/benefit, plus extrusion issues, make it not feasible.
As for the cost of Kevlar, no question that it, and just about all other forms of synthetic rigging -- other than heat-treated Spectra -- are absurdly expensive/short-lived. But I don't think that is what you asked about.
Fair leads,
Brion Toss
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