Dear Karandish,
Considering the kind of crack and the type of connection, one of the reason for the failure could be low cycle thermal fatigue & bending stress.Please remember Austenitic stainless steel will have higher thermal coefficient of expansion. I dont think it has happened "only" because of metallurgical degradation.
Was this failure happened after any thermal shock due to abnormal operating condition like emergency shutdown?
what about stress analysis report for those coils? Sufficient flexibility was there and stress induced were with in the allowable stress limit?
On Sat, Sep 17, 2011 at 9:08 AM, AA karandish <aa.karandish@yahoo.com> wrote:
Dear Vanchi,I had made a typewriting error the correct material is A312 TP 347H, welding is performed at vendor shop (not at site) I am searching in the vendor documents, and will inform you more detail about welding consumable, treatment ,...Regards,Karandish
From: Vanchinath S.A. <vanchinaths@gmail.com>
To: materials-welding@googlegroups.com
Sent: Friday, 16 September 2011 9:59 AM
Subject: Re: [MW:12463] mixed feed convection coils
-- To post to this group, send email to materials-welding@googlegroups.comTo unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.comFor more options, visit this group's bolg at http://materials-welding.blogspot.com/The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.Dear Karandish,Is the material 304H or 347H. I presume it should be 347H. Did you carryout any stabilisation treatment upon completion of weld? what is the metal temperature and what consumable was used for weld?regardsvanchiOn Thu, Sep 15, 2011 at 3:15 PM, AA karandish <aa.karandish@yahoo.com> wrote:--
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With Regards,
Sudharsan
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