SS316 Clad Vessel vs SS316 Solid

[stephenzztan]

Hi everyone,

Is it true that for SS316 cladded vessel, it could withstand higher/ more severe conditions (chloride, temp, etc) than solid SS316L vessel?
SCC generally requires tensile stress, appropriate corrosive species and material susceptible to SCC (this case austenitic). DOes cladding removed the tensile stress and always in compression mode hence the chance of SCC is low to none?


Thanks a lot.

 

[EdStainless]

No, but in some cases it can help.
Still plenty of opportunity for localized tensile stress.
What temp?
Chemical?
Temp cycling?
Pressure/thickness?

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P.E. Metallurgy, consulting work welcomed

 

[weldstan]

If SCC does occur in the cladding, it will not lead to rapid failure of the vessel. Clad vs solid is chosen for this reason or for economic reasons. Remember that the stainless steel cladding can be roll clad, explosion clad, of weld overlayed.

 

Tensile stresses sufficient to qualify for chloride SCC are a given, especially in a vessel. When doing failure investigations involving SCC I usually don't need to look very far to find potential sources of tensile stress, either residual or applied.

Differential thermal expansion between the stainless clad and the steel substrate causes significant interface shear stress all by itself.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[0707]

I agree with ironic metallurgist.

luis

 

[SJones]

1. No

2. No

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.