Quote Originally Posted by Drew1966 View Post
Wouldn’t hold an edge. Needs a piece of 1080 set into the rebar for a blade.
That would very much depend on the rebar.

Rebar varies a great deal in carbon content as it is usually made from a 'whatever' mix of scrap steel(rebar from the same source manufactured a day apart can be completely different), some is completely unhardenable and some will get glass hard so the only way to know is to take a piece of the rebar you want to use and try to harden it before deciding on whether or not it is usable.