A2 is a medium-alloy cold worked tool steel, which uses air as its quenching medium. The temperature range is 1700F-1800F. Tempering temperature is 350F-1000F. The resulting hardness is 62-57 Rc. Hope this helps.
The plates edges are plasma cut (burned), there is a slot 0.25 deep that is machined into to GROUND face of the burnout (24"x24" area) that 1/2" keystock fits into. The surface in question is the sidewall of the slot which is held by 3plc dimension. By the way the plate is 1.50 inches thick...
I have a question with regards to surface finish callouts.
If you had a 24"x24" A36 burnout plate with 2 keyways anywhere on the finished side of the burnout, and the keys are parallel, held to +/-0.001 to eachother with a 0.500 +0.001 -0.000 key width x 0.25 deep. Do you need to add a surface...