Eh?
MissionKnives.com, The Toughest Knives in the World! and root around a little.
Comparing a Rockwell value between steel and a titanium blade is a real apples vs. oranges problem. The titanium is much more abrasion resistant than steel so the comparison of hardness values does little to determine how well, or how long they will cut. Titanium is capable of heat treatment. A very tough knife, but true, probably not a very good razor.
The titanium coatings used on cutting tools is a deposition layer of titanium nitride or carbide, sometimes even boron. Rc 80, very hard stuff, not just plastics.