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Ryerson Steel is one supplier of CORTEN A and B.  According to the
Ryerson supply manual, CORTEN A is for thicknesses to 1/2 inch and
conforms to ASTM A242 (Type 1), and CORTEN B is for thicknesses
over 1/2 inch and conforms to ASTM A588.  They are often used
wherever weight reduction or maintenance cost savings are prime
considerations.  It has a yield strength of 50 ksi and a resistance to
atmospheric corrosion four times greater than carbon steel; but it costs
about 35% more to manufacture than A36 steel according to Ryerson. 
It's listed as a structural steel, but Ryerson can manufacture CORTEN A
to a minimum of 3/16 inches thick.  Hope this helps.

Good luck!

Michael S. Davis, P.E.

>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.Thanks