I think that over 100 years ago carbon steel was common even for expensive brands and then alloys became more complex.
I think big brands like Snap On and Wright may keep their alloy formulas as company secrets
Thousands of years ago-fancy expensive swords-did the smiths keep secrets about how they made the steel?
Might look up some histories on "Alloy Artifacts" there might be an account on how,say,Armstrong alloys changed over time