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Ranjana Kushwaha
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Join Date: Oct 2011
Posts: 2

Cracking of Steam Coils of SS316L of Sulphur Pit

10/12/2011 2:55 AM

Sir,

I have a query about welding of steam coils of SS 316L. During the shutdown of sulphur recovery unit,steam coils were removed from the sulphur pit. steam coil was cut into two halves to remove the severly choked sulphur inside the coil. While joining the coil after cleaning, craking was observed in the parent metal. Preheating was also done to prevent the cracking but still cracking was observed in the parent metal. Can you please tell me what may be the exact cause of cracking.
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welderman
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Hobbies - DIY Welding - New Member

Join Date: Sep 2007
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Good Answers: 58
#1

Re: Cracking of Steam Coils of SS316L of Sulphur Pit

10/13/2011 9:17 AM

I don't enjoy being the bearer of bad news, but 316L is formulated for low carbon and sulfur. Both these elements promote cracking during welding. I suspect that operating at elevated temperature for extended time has resulted in sulfur diffusion into the surface of your coils, and that they will need to be replaced with new metal.
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Ranjana Kushwaha
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Join Date: Oct 2011
Posts: 2
#2
In reply to #1

Re: Cracking of Steam Coils of SS316L of Sulphur Pit

10/13/2011 11:32 PM

can you explain it in more detail, how sulphur diffuses in metallurgical structure, what happens to the grains, HAZ portion, how cracking takes place
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welderman
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Join Date: Sep 2007
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#3
In reply to #2

Re: Cracking of Steam Coils of SS316L of Sulphur Pit

10/15/2011 5:42 PM

Excellent question. It would take volumes to provide an adequate answer. I suggest you begin with http://springerlink.com/index/535153K1741728L1.pdf
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