riversw,
Dex handled this well for me, but he did leave that out...the D2 is tempered to 60Rc. The Ti is purchased in the "hardened state", which basically means that it is alloyed and stabilized. If we started messing with it, trying to make it harder, which is not needed, we would screw up the spring qualities, which IS neede for the lock.
I hope this helps,