I only made one knife of A2 ( heat treated by Paul Bos ). It is my
Grandson's main hunting knife. I ground the edge to about .015, and
it really cuts! The edge holding is not as good as D2 at HRC 60, but
very good. It has very good toughness thereby allowing the edge to be ground quite thin. A2 only has enough chrome to make it air hardening, so the stain resistance is like any high carbon steel, almost nil. I would be reluctant to heat treat it myself unless I had
good equipment and access to cryo, and a Rockwell hardness tester. If you want to heat treat yourself, go with O1.