Advice for Weld Overlay in vessel required: 1

[ahsinnaqvi]

one of the vessel we had the issue of preferential weld erosion corrosion as compared to parent metal (shell course/dished head), up to the height of ~3.5m from bottom dished head. It was repaired by welding.
Advice on suitability of weld overlaying of above specified affected area (say 3.5 to 4m height) by duplex /super duplex stainless steel (e.g. 2707 grade).

 

[metengr]

What was the shell/head base material?

 

[EdStainless]

Duplex alloys are a poor choice for weld overlay.
Keeping the correct composition and microstructure with no secondary phases is very difficult.
This is why austenitic alloys are most commonly used for overlay.

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P.E. Metallurgy, Plymouth Tube