On Thu, 14 Mar 2013 09:38:40 -0400, "Stormin Mormon"
wrote:

Do any metals contract, on heating?

There are special formulations of Invar that have a slightly negative
thermal coefficient. The common grades used in industry are close to
zero.

--
Ed Huntress



Christopher A. Young
Learn more about Jesus
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"Martin Eastburn" wrote in message
...
Remember Al expands on heating - and you will be hearing as you
cut or mill on it - thereby cutting off or milling off more than you
plan. The metal will have to be flooded as you cut - to keep cool and
make the cut in the right place.