February 25, 2011 in Photo Questions
What type of metal is this?
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Annie Thornton
This, I believe, is Corten steel. It is a steel alloy that turns this reddish/orange from weathering. The rust appearance actually strengthens the material. It becomes this color after a few years of exposure.
February 25, 2011 at 11:08am     
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Annie Thornton
Just to add some more information about cor-ten, by dad just sent this to me:

It's what we call a high strength, low alloy steel. It can be had in all shapes ( plate, bar and tube ). One of the things it's alloyed with is copper so it will rust on the outside but the rust forms a barrier that preserves the steel underneath. It will never need painting and during the summer it is perfectly colored for it's backdrop. Cor-ten is used a lot for bridges and in ship building.
March 1, 2011 at 8:58am     
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Anniekendall, Thanks so much for all the information!
April 15, 2011 at 8:10am   
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Annie Thornton
No problem. If you haven't already, make sure you check out John Hill's ideabook on cor-ten steel.

April 15, 2011 at 8:57am     
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