Can stainless steel hot-bent pipes be used for liquid oxygen pipelines?
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The design temperature is -196°C and the pressure is 0.5 barg; there are also cracks in some areas
Are there cracks in some parts as well? That’s it, it doesn’t work anymore
The presence of cracks indicates that the deformation and stretching were excessive, damaging the material; it has strength defects and cannot be used. Logically, stainless steel has good toughness and can withstand moderate cold bending without issue; so why resort to hot bending? Heating may damage the material’s heat-treated condition at the time of manufacture, thereby affecting both its mechanical properties and its corrosion resistance. Additionally, I am skeptical about the on-site hot bending deformation processing technique for stainless steel (as it cannot be fixed or stabilized on site)… This is just my personal opinion for reference only!
Thank you to the two people above. There are 7 bent pipes in total, and 5 of them have cracks; therefore I think the remaining 2 might also have problems. Additionally, I noticed pits on their inner walls, so I plan to return them
This ultra-low temperature one probably requires cryogenic treatment