Duplex SS - grade 1

[jam69]

Dear All,
I am not a expert in this field but, in certain extend, my work do requires me to endevour into this field. Can any of our fellow experts explain to me the difference between
Duplex SS ASTM A790 UNS S31803 and Duplex SS ASTM A790 CD3MWCuN in term of chemical composition, physical properties and commercial value

Your input is greatly appreciated.


Thank you.

 

[GRoberts]

A790 is "Standard specification for Seamless and Welded Austenitic Stainless Pipe", and contains UNS 31803, which is commonly called 2205. For lots of information on this alloy, see a manufacturers web page, such as

http://www.avestapolarit.com/upload/documents/technical/datasheets/AVPDuplex.pdf

CD3MWCuN is a cast grade of stainless steel commonly called Zeron 100. It is not referenced in A790 since those are wrought material. It is listed in A890 as Gr. 6A (UNS J93380).