Chain Plate Material

[Brion Toss]

Hello,
I hate to say "it depends," but, um, it depends. My favorite is grade 5 titanium, but only if of good quality, properly worked. Hard to argue with something that is much stronger, and almost completely corrosion-proof. Can cost more, though.
Aluminum bronze is more readily available, and there are more people around who can work it.
Stainless is more available still, and the most familiar material to fabricators. Type 316L is not horrible, and we still install it if the above two options are for some reason not available or attractive to the client.
Fair leads,
Brion Toss