What are the machining properties of 4130? Perhaps this is the best
compromise between finish and toughness?

4130 is a crome moly steel. Tough to turn; especially when compared
to leaded steel. Not exactly cheap to buy either.

I picked up a large bar of steel that appeared to be hot rolled.
It machined easily after removing the crusty surface. Sometimes
cold rolled (1018) machines well and sometimes it is tought to
get a good finish.

chuck