[PGSigns]

Never seen a table build g
from hardened steel. Have seen some built from some pretty good stuff. First test is to center punch it and see if it leaves a mark. It should. Another test is to run a file across the edge and see how it cuts. If a file will cut it it can be drilled. You are going to need good quality bits and a center drill if you can find one. A good cobalt steel bit will cut most any steel you can weld. It will have a 143 degree split point to help it cut the harder material. Home depot has some of them. Straight engine oil will do better than 3&1, Tap Magic will do even better. I have seen some of the offshore bits that won't drill rotted pine.
Jimmy