Cor-ten weathering steel
Cor-ten weathering steel
(OP)
Does anyone know of any additional issues associated with the use of cor-ten weathering steel? Are there any compatibility issues with welds/fasteners e.t.c?
Will galvanised bolts work?
I havent been able to find much info on the US steel site.
Will galvanised bolts work?
I havent been able to find much info on the US steel site.






RE: Cor-ten weathering steel
http://ww
RE: Cor-ten weathering steel
Dik
RE: Cor-ten weathering steel
There are a number of resources linked from the Wikipedia article:
http://en.wikipedia.org/wiki/Weathering_steel
Hg
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RE: Cor-ten weathering steel
RE: Cor-ten weathering steel
http
RE: Cor-ten weathering steel
RE: Cor-ten weathering steel
AS I remember, there was also an issue with the corrosion weathering off due to wind and other wear and the sections being eventually reduced to an unacceptable section.
Well, as the links above show, there's no such a thing as a free lunch. Why do you want to use it anyway?
RE: Cor-ten weathering steel
Type Corten in the search box, in top of this page and select Search Posts in the advanced search box. This steel has been detailed to extreme end in the last few years, happy perusal for you. You'll find everything you need to know.
cheers,
gr2vessels
RE: Cor-ten weathering steel
Hg
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RE: Cor-ten weathering steel
RE: Cor-ten weathering steel
Often the ends of all the girders are painted where the bridge joint is, both because the steel may need some extra protection from an open or leaking joint and to prevent the water from carrying rust down the support. They try to match the color of that end paint to what they think the weathered color will be, but it's hard to get that match. So sometimes they paint the fascia girders so they don't have to worry about the color match.
Other times, it's been decided (by whoever) that a green, beige, blue, whatever color bridge is what is wanted. Not everyone likes brown for their infrastructural monuments. If you asked the public to vote on a color for their bridge, I doubt brown would be in the top 5 choices--and a major span across the Delaware River had better take aesthetics into account. An economical approach in that case, rather than painting the whole bridge just for aesthetic reasons, is to use weathering steel and paint just the fascia girders.
So what's so funny?
Hg
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RE: Cor-ten weathering steel
RE: Cor-ten weathering steel
This was an incident were it was used as the foundation for a house and had to be replaced with an engineered laminate beam. Had it not been spotted during a plumbing repair it could have been a disaster for the homeowners.
RE: Cor-ten weathering steel
yes, the above mentioned articles go through where the steel is appropriate/innapropriate.
HgTx,
What innacuracies are there in the AISC article? It all seems pretty reasonable stuff to me, but I have never used this material before.
csd
RE: Cor-ten weathering steel
Here's the Mittal brochure (formerly the ISG Cor-ten brochure):
ht
The Cor-ten info they have in the Steel Interchange article seems almost to imply that Cor-ten needs to be painted even more than regular steel does, since it stresses that any surface "not boldly exposed to the weather" must be painted. Faying surfaces, non-fascia surfaces of bridges, indoor applications, etc.
That just ain't so, and the Mittal publication doesn't say it. There are two different ways "proper oxide formation" can be prevented. One is in a highly corrosive wet environment where the steel will continue to corrode, lose corrosion product, corrode again, etc. (The building foundation mentioned in another post would be a prime example.) But then there are areas in which nothing much happens to it--like a properly detailed faying surface (the Mittal flyer does say to keep bolt spacing close enough to exclude water) or the underbelly of a highway overpass in moderate climate (not a lot of salt spray kicked up from underneath). For example, there is a 40-year-old WS bridge in Austin, TX (eastbound 51st St. over I-35, I believe), that never even formed the patina on its non-fascia surfaces. It's flaky, but shows negligible section loss. Austin isn't as humid as Houston, but it's not Phoenix either; relative humidity in the mornings is around 80-90% year-round. For interior exposure, if you wouldn't paint your non-weathering steel, you have no reason to paint your weathering steel either.
The USS literature cited by AISC deals excessively with when WS needs to be painted; as I said, it almost implies that it needs to be painted more than ordinary carbon steel. In reality, if you're going to paint WS, you might as well not use it. It won't do its weathering thing under the paint, and will corrode through a paint pinhole just as badly as ordinary carbon steel will. Paint on WS is not a case of belt and suspenders.
Hg
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