Questions regarding the welding of stainless steel pipes
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I would like to ask the experts: if cracks appear in the welds of stainless steel pipes after they have been in use for some time, is it due to problems during welding? Are there any tips to avoid this problem? Pipes carry steam, cooling water, and chilled brine
Refer to stainless steel delayed crack propagation
Stainless steel, Cl- ions – is corrosion possible?
Stainless steel pipes are usually austenitic stainless steel pipes. . As for what grade is being used, I don’t know. . This medium contains chloride ions, and for ordinary austenitic stainless steels such as 304, corrosion will occur in the welds. Until it ruptures. There are issues such as intergranular corrosion, pitting, and stress corrosion cracking. . It is necessary to avoid such a situation: 1. Replace the material with a low-carbon austenitic stainless steel that is more resistant to this type of ion corrosion, or with grades such as 316 and 316L that contain stabilizing elements like Mo and Nb. 2. Use low-carbon welding materials. 3. Control the temperature between welds during the welding process; perform rapid cooling during welding (by using water to cool the weld). 4. Perform pickling and passivation after welding. 5. If conditions permit, perform solubilization treatment on the weld. .
After being in use for a period of time, cracks appear in the welds of stainless steel pipes – is external stress involved?
It’s a welding issue; it’s likely due to excessive welding residual stress, which causes delayed cracking. Also, it’s better if you mention the operating conditions as well