ER2205 31803

[geauxinspect]

I have done quite a bit of research on duplex in the past few days and still have one unanswered question! We will be joining 2205 to same in kind. We are running a slurry at 3500psi at a temp. of 200*F through this line. Should we be using the ER2209, or the ERNiCrMo3 wire? I have yet to find a clear answer on which is mechanically better with this type of process. If I left out any details that would be needed in defining an answer let me know! From what I have seen the ERNiCrMo3 wire is a better choice, but would like a lil input why this is a better decision.

 

[metengr]

The ER2209 should be used. Why? Because if your base material is a duplex, the ER2205 is formulated to achieve a 50% ferrite and 50% austenite (duplex) microstructure in the as-deposited condition. "Over matching" the filler metal in terms of chemical composition versus strength to improve abrasion resistance is not warranted in this application.

 

[EdStainless]

2209. No question.

I don't want to sound picky, but I feel that I should make a point. When you say '2205', you are talking about S32205. There is no common name for S31803 in the ASTM specifications. Yes, all S32205 also meets the S31803 requirements, but the name is specific.

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[geauxinspect]

Yes you are right... It should have been brought to my attention, thank you both!

 

[CRMagruder]

Another point about ERNiCrMo-3 to consider is how it will be used in the joint. This filler metal contains ~9% Mo, which is a powerful ferrite former. If you are GTA welding pipe with an open-root joint, the root will have a lot of Mo because the filler metal is diluted the least in this pass. The influence of Mo can cause the root pass to be very unbalanced in the intended 50% Austenite / 50% ferrite microstructure. This can lead to problems with corrosion and hydrogen induced cracking.

 

[EdStainless]

CRM, good point, I am even more concerned though if the root of the weld is high in ferrite it may be brittle compared to the rest of the system. (not just H2, but higher DBT and less ductility)

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[geauxinspect]

I got a wps for the ER2209... I had just been doing a lot of reading up afterwards and seen a few sites recommended the ERNiCrMo3 wire so I was curious. We will be doing ferrite readings to make sure we are where we should be. This site has a lot of good input and I look forward to future information learned! Thanks to all who replied and informed!!