On 02/02/2012 21:03, Ed Huntress wrote:
On Thu, 2 Feb 2012 12:12:35 -0800, "Steve wrote:

Just how much strength is lost when heat is used to straighten something? I
know it varies with the amount of heat applied, and over what area, but is
there any general statements that hold true across the board?

Steve

No. None. Nada.

Except one: If it melts in your lap, it's lost all its strength.


If it's basic mild steel then it won't actually lose strength when it
has cooled (unless it was work hardened, but then annealing at a
suitably high temperature will reduce the strength but restore the
ductility).

Carbon steels, now that's a different story, as Ed says.