Cracks appear on the reduced-diameter tees of stainless steel TP321
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It’s a diameter reduction from 273 to 114; the pressure-reduction condenser has been in use for three years. What could be the cause of these cracks? When they were first detected, welding was done using 309 weld rod, but cracks appeared again as shown in the third image. I would appreciate some advice from experts. There are 9 in total, and 5 of them are cracked.
It seems to be stress cracking; if the main material is fine, it might be related to internal corrosion.
It seems to be quite far from the weld; preliminarily, it is not a welding issue – it’s likely a defect in the material, resulting in stress corrosion cracking.
Things like stress corrosion may be related to corrosion under insulation