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[MW:23152] 20 Chrome/32 Nickel, Nb- Centrifugally cast tubes

By Materials & Welding

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

 

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