Failing that look at hardox. The cut edges hardness barely changes when plasma cut. laser cut and its even less - practically irrelivent for your needs. Thing to remember with hardox and some of the other wear resistant steel is its not just a heat treat that gives them there properties. A lot of it is in how the sheet is finally rolled to thickness. You won't be punching holes with any kinda tooling life expectancy in hardox, far better to use a thermal based cutting process. Slightly under sizing the holes to allow for a minimal amount of wear in use is common on screening applications, like this you average the size you want for the longest possible time, its a function of screen thickness though, as it generally wears the edge of the hole out and only finally opens the bottom of the holes diameter wise last. If anything 1/2" might be too thick to get optimal life out of. Going thinner on screens can have a advantage with material flow and wear life versus costs are considered. Google hardox and look at its specification sheets, loss of hardness with diffrent cutting processes is covered in detail. But IMHO your trying to fix a problem that does not exist in the real world. Equally the wear of screens is well understood you just need to go look it up rather than try and invent it. Most of these steels are designed to resist wear from earths - soils - rocks. They will laugh in the face of even slightly gritty wood chips for a very very long time!
