Re: [MW:17986] SCC of Stainless Steel in H2S service

H2S is a worse corroding medium for SS than chloride. SCC depends both on corrosive medium and stress.

For details, please check on SCC in Metals Handbook or net.

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From: "avinash.araj@gmail.com" <avinash.araj@gmail.com>
To: materials-welding@googlegroups.com
Cc: Shomenath Bagchi <snbagchi@ymail.com>; snbagchi@ymail.com
Sent: Thursday, June 20, 2013 1:47 PM
Subject: Re: [MW:17985] SCC of Stainless Steel in H2S service

Dear Sir,

 

Thanks for your reply.

I agree that  SCC (Stress Corrosion cracking) damage in Stainless steel is multiplied because of STRESS.

 

But my query here is that this SCC effect (because of chloride and stress) is even more damaging in Presence of H2S (sour service).

 

Can you please explain this phenomenon?

 

Following is an extract from NACE MR-0175/ISO-15156 "

"stress corrosion cracking SCC

cracking of metal involving anodic processes of localized corrosion and tensile stress (residual and/or applied) in the presence of water and H2S.

NOTE Chlorides and/or oxidants and elevated temperature can increase the susceptibility of metals to this mechanism of attack."Regards

Avinash Araj

 

On Thursday, June 20, 2013 10:30:31 AM UTC+5:30, Shomenath Bagchi wrote:

Simply put, applied stress (stress energy stored in material) aids corrosion and expand small fissures in cracks.

 

 

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From: "avinas...@gmail.com" <avinas...@gmail.com>

To: material...@ googlegroups.com

Sent: Wednesday, June 19, 2013 4:28 PM

Subject: [MW:17980] SCC of Stainless Steel in H2S service

 

 

Dear All,

 

I require your expert guidance on the below matter.

 

As we all know SS matl is prone to SCC (Stress corrosion cracking) in presence of Chlorides.

Now, as per various articles on the net, when this matl is additionally subjected to wet H2S service, the damage due to SCC is increased significantly.

 

So susceptibility of SS to SCC, is more in wet H2S /Sour service.

 

Can anyone put a light on this subject, as to why/how this happens?

 

Regards

Avinash

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