2205/6% MOLY (75/25 SPLIT

[copelajo]

Does anyone know the SA spec No. or the UNS for material that would be applicable when 2205/6% MOLY (75/25 SPLIT) material is called for. I don't know where to find details or a manufacturer of such a product. Any basic info would be very helpful

 

[SJones]

They are two different materials, so on what basis are they being 'split?' 2205 is duplex stainless steel, UNS S32205. 6Mo covers several options: UNS S31254, UNS N08926, UNS N08367, for example

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

 

[copelajo]

That is what I am trying to figure out. I am assuming the engineers are calling shell plate that would mate the two materials. For instance, if the shell was 20' in height, the lower 5' would be 6Mo and the upper 15' would be 2205. I have never seen anything like this called out before, so I wanted to make sure there is no material out there that would be a mixed alloy of the two materials or something strange.

 

[Guest102023]

Sounds like the mix is in the construction as you detail in your second post. You don't actually 'mix' alloys.

You will need to join these two alloys, however. The filler metal will be the one used for the higher alloy base metal, in this case it is non-matching = Inconel. You will also need to respect the heat input requirements of the 2205 duplex so as not to damage its corrosion resistance and fracture toughness.

Don't give this work to a back-alley carbon steel shop.