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answer to #15 from seaoc Digest for 7 May 1998

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ASTM A588 is the proper ASTM number. "CORTEN" is the USS trade name for 
the product. Bethlehem called it weathering steel. I'm not sure how thin 
you can get thim material, however. Check with USS and Bethlehem 

Another option to check: ASTM A242, which also has weathering 
characteristics like those you describe.

Charlie Carter, AISC

From: Lynn <lhoward(--nospam--at)>
To: seaoc(--nospam--at)
Subject: CORTEN steel
Can anyone provide me with information on CORTEN steel;... you know, the
stuff that forms a light rust appearance on the outside and is supposed
to provide good resistance to further corroding.
I would like the ASTM number and or suppliers of this steel.  I am
looking for sheet metal cladding specification, not structural wide
flange type members.