Hardox 650 in the Disks.
These were watercut for the Swedish roboteer Christian from an 8mm thick testplate he secured from SSAB. Unfortunatly, the watercutting firm misunderstood the order and had cut more disks than asked for.
The axehead of Obsidian is from that same plate.

SSAB didnt commercialise this grade, and the highest grade available is the 600.

I never succeeded drilling a hole in it, nor enlarging existing holes. The drills heat up and that was it.