Have you considered the Inconel family? Possibly Inconel 718 (Carpenter's Pyromet 718). Hardness should come in at 220-230 HB and tensile should be 185 ksi min (per AMS 5662L). Try National Specialty Alloy for a source.
Thanks to TVP for the reply. I have the Stahlschlussel guide but not the ASM guide. I will purchase it.
Sorry for being too vague with my post. I'm a first timer.
Anyway, we have begun manufacturing (machining)parts for theme park applications. These parts have high liability requirements and...