If you cut Anything, you have 'damaged' the edge.

Oooo... that's where knife blades made from all-hard ~65hrc HSS
power hacksaw blades... come into the picture.

Maybe not the sharpest edge obtainable but will sure as heck get
sharp and cut a lot of stuff before you notice much difference.

http://www.panix.com/~alvinj/HSSknife.htm

Alvin in AZ