Knife Steel: 52100
The story is that this was originally developed for use in ball bearings.
Apparently it is now available in some kind of sheet, suitable for production knives.
Many people love it, and its strongest point may be that it is easy to sharpen
to a fine edge. Spyderco has done a number of exclusives and sprint runs using it.
Drop me a line!
Tom's Knife Info / firstname.lastname@example.org