I may be the king of mystery metal. Bought more than 20 tons at a
machine shop estate auction a few years ago.

I drill it to see how hard. Then I can tell what cutter to machine
with. For me, sparks only tell me, yes its a tool steel. can't tell
which one.

I did figure out the steel with green paint was low carbon, the yellow
paint was S7, and the red paint very likely 4140. I have 1000lbs. of
S7 and 4000 lbs. of 4140, maybe ten tons of green paint I'm calling
cold rolled. At least five tons that's likely for molds but I'll never
know for sure.

P.S. If you decide stick hardface will work for ya, I'll mail you a
care package. I've got 20 different kinds of hardface if you have a
specialty need. - Another auction, bought the whole inventory.

Karl