20 Chrome/32 Nickel, Nb- Centrifugally cast tubes

[Ramesh Bapat]

Hello Experts

 Client has encountered what appears to be a corrosive attack in the HAZ of the pipe to tee welds on Metaltek 20/32 Nb material. This area was solution annealed at 2000 F for 6 hours. The corroded/eroded areas were not present prior to solution annealing based on previous inspection.
   The area has been penetrant tested with no relevant indications. It has also been examined by phased array with no evidence of cracking. It appears the base metal has eroded under the weld bead in the area of the HAZ.
 Can you please offer opinions on the cause and corrective actions, if possible?

Thanks and Best Regards,

Ramesh

 

[Ahmed Eissa]

please provide more details regarding application, stream handeled oerating conditions, Dwng. history of joint, etc


ahmed eissa
material and corrosion engineer
--------------------------------------------
On Sun, 7/12/15, Ramesh Bapat <rba...@hotmail.com> wrote:

Subject: [MW:23152] 20 Chrome/32 Nickel, Nb- Centrifugally cast tubes
To: material...@googlegroups.com
Cc: rba...@hotmail.com
Date: Sunday, July 12, 2015, 2:22 PM

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