Quote Originally Posted by Bruno View Post
Ah ok. In that case I understand.
I found that heating in an iron pipe also prevents the formation of heat damage.
I do the same, but in a gas forge. I also put a piece of charcoal in the end of the pipe to keep a reducing atmosphere in the pipe. I get no scale at all.

Caution: Do not try the charcoal trick in an oven as CO is a fuel and could cause an explosion!