Where do knife steels come from?

[grepper]

Mr. Mike uttered, "For example, we reported that our HRC50 1095 spring steel knife edge rolled almost twice that of our HRC56 Henkel edge.  Our edge rolling element impinges on the edge at a 10 degree angle and moves linearly down the edge with only 150 grams of force applied. Why didn't the edge just "pop" back to, at or near, it's original position?"

You ask a very good question Mr. Mike.  Spring steel is exactly that; springy. Does that mean that the spring characteristic in the metal at the edge has been removed? 

So I'll ask the question again.  Why wouldn't the the spring steel edge spring back after only being bent 10°?