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What is 'Black Iron' as in NYC ceiling suspension system?

January 31, 2008

What is 'Black Iron' as in that required for NYC ceiling suspension system?
I understand New York City requires 1/4" diameter steel rods and 1 1/2" cold rolled steel channels to support ceilings...
But its referred to as 'black iron'.
What do they mean? Is that a particular type of steel?
Is it finished in a particular manner?
Would specifying galvanized rods and channels be same material?
Thanks in advance for any input you can offer.

Annie Marciano
Architect/Specifier - Morganville, New Jersey

Black iron has generally been used to refer to hot rolled steel (HRS).

Gene Packman
- Great Neck, New York
February 1, 2008

The full explanation is in NYC Building Code Reference Standard 5, and specifically in RS 5-16.

Michael Calvi P.E.
- Yonkers, New York
December 2, 2009

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