I did not say REPLACE, I simply said inspect- my chainplate broke in a small craft advisory on the St. Johns from a fracture between the deck and underside so my visual inspection was worthless- you had to PULL THE CHAINPLATE to be able to see it. So after three years you SHOULD pull the chainplates and inspect- BOTH SIDES!!!!! I only pulled the starboard side and it was so nice looking I skipped port. Port was the one that snapped in 25 knots risking mast collapse.
Also- Circumnavigating is WAY different than occasional sailing. The CONSTANT stress and loads, salt corrosion, and constant use warrant a COMPLETE CHECK UP after said circum navigation INCLUDING chainplates titanium or not. I said a rig is good for 10- yes it can make 20 but come 15 Im replacing unless Im in fresh water. Your standing rigging is only trumped by your seacocks. Standing rigging includes chainplates. So unless your going titanium shrouds and turn buckles too I REALLY dont see the point in the expense of titanium over 306.
Unless your chainplates are installed on the outside of your hull, (unlike mine), they are generally installed in such places that corrosion can more easily get to them than to your exposed turnbuckles, etc., which again, you can much more easily clean up.
So, there is a big difference in the full spectrum of stresses which the plates will be exposed to vs. the rest of the rig. Titanium will NOT rust.
And, as I mentioned, in reality I am only going to change these once. So, I will use the best material available for those, and then I won't have to take apart my cabin interior to "inspect" them. Which unless you are going to do the dye test, or an Xray, just looking at them doesn't really tell you jack.
Why fight using the best especially for such a deeply nested, hard to replace, and important part(s), which statistically speaking, you are only going to replace once, per boat you own.