I have written several articles about CATRA testing and the effect of Rockwell hardness on properties. Here are links to a few relevant articles:
Those articles introduce what Rockwell hardness means, what properties it controls, and introduces CATRA testing and what it measures. I will not be re-introducing it here, other than to say that hardness is a measure of strength, and also improves resistance to wear. An improvement in strength and wear resistance helps with slicing edge retention. CATRA is a slicing edge retention test where the knife cuts through cardstock with a 5% silica content which abrades the edge. The amount of cardstock cut with each slice is recorded over a 60 back-and-forth stroke test. CATRA edge retention is controlled by edge geometry (edge angle and thickness behind the edge), steel hardness, and the volume and type of carbides.
Knife Steel Nerds is a fantastic site. If you haven’t checked it out, you really should. Great stuff within.View Linked Article