DIYbanter - View Single Post

In article ,
says...

How about, get a couple of flat pieces of aluminum plate, 1/2" thick or so,
sandwich the steel between them, and heat the whole assembly until the
steel relaxes enough to go flat, then let it cool while the steel is
being held in place by the aluminum?

By the time the steel is hot enough to "relax" the aluminum will be
downright runny.

Ned Simmons