Titanium isn't 5x stronger than steel, it is comparable to mild steel in most cases, generally it is a bit softer than steel, and a lot softer than hardened steel.
That's not true, there are no indestructible rings, softer rings can be cut easily by probably any ER in the country, or even some EMT devision. Harder rings such as Tungsten Carbide can easily be broken off. Both cases with little or no damage to the finger underneath.
Whoops, had to look it up. Titanium is 1.5x steels tensile strength in the same weight. I heard the 5X reference on the Discovery Channel about battleship hulls. I am going to stop watching their shows. Really poorly researched.