Grunt58:
You can buy these materials directly from specialty steel suppliers, in finished form, as bar stock. Ask some of them. It’s been so long since I’ve spec’ed. any that I don’t remember ASTM numbers, etc., but I have dealt with your problem a number of times before. You do not want to have to do any special treatment yourself. The big problems are that it is not weldable, it wears out tools quicker than you can change them becuase it is so hard, so minimize and really clean up your connection details to the supporting structure. Consider a bar which is not wider than needed and maybe a bit thicker than you think is needed, so there is limited curling of the bar in cross section due to the running of the cam roller.