My first real job was prep and plan engineer in tool and die factory, we made dies for pressure aluminum casting.
Dies could get pretty complicated, you talk 100s of hours in machining and finishing process.
The steel used was CSN 19552, that equals 1.2343 (X38CrMoV5-1) and on the end it had to be hardened of course.
It happened at least once that a part would not harden and we would find out that somebody in the process screwed up the original part and replaced it with a plain carbon steel - and nobody knew anything till the very end. People did not want to pay for the damage, but it would be cheaper for the shop to pickup the cost of the material than machine a complicated part from a piece of common steel.
BTW the centrally planned production of the east block wanted to shut us down many times, but because we made parts for the East German Navy - yeah, that really existed
- we could always refer to defending socialism or some similar BS and russians would not let it happen.