George Watson wrote:
I have notice when buying tool steel the smaller the quanity you buy the
more expensive it gets

so I thought would it be possible to make my own in a crucible by mixing
scrap stainless, mild steel and a measured amount of powdered graphite to up
the carbon content

anyone got any idea if this could work?

Sure, once you've got the appropriate crucible, furnace, temperature
controller, exact specs of the alloy you require and your ingredients,
it's almost trivial.