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Microstructure of original line showed carbide precipitation at grain boundary while cracks are intergranular, so we believe that it was caused by sensitization and pressure it held. thank you both XL83NL and metengr. Could you please also recommend heat treatment profile, is it 900 C for 4...

thank you for your suggestion. I will use detector probe technique and is planning to use approx. 3 barg differential. Thank you

It was designed to be SS321 since its first day. However, it failed after about 10 years of service, so we need to buy new material for replacement.

Hi, I am going to order a batch of SS321 piping (NPS14 sch.160 ; thk 35.71 mm) to use in estimated temperature of 500 C which is in sensitization susceptible range. Could anyone please suggest if I do require stabilization heat treatment after solution anneal ? If it is required (or...

Hi, I would like to have Helium leak test (with mass spectrometer detector) for vertical heat exchanger tube but I am not very sure how much pressure I need to use ? Per ASME Section V Article 10, I should test it at pressure "not greater than 25% of design pressure" while test pressure is "at...