Since you hardened the edge of the 4130 the only way is to soften it. I
would try "very slowly " run your cutting torch along the edge... I am
guessing at an inch every thirty seconds ( 1/4 plate?). The thicker the
plate the worse will be the quenching effect so you may have to even move
more slowly.
If that doesn't work it is time to anneal in a furnace and cool slowly
as possible.
I hate to say it but flame cutting was the problem. The only way to cut
the stuff without having a HAZ is to saw or water jet cut it.
Randy


"Gunner" wrote in message
...
How do you guys handle working with a HAZ on plate? Heat Affected
Zone..on flame cut plate.

Its driving me nuts trying to square up some rectangles of flame cut
4130

Im doing it now...on a shaper..simply because it was killing my
endmills

Gunner



"A prudent man foresees the difficulties ahead and prepares for them;
the simpleton goes blindly on and suffers the consequences."
- Proverbs 22:3