Pipe flange neck crack
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The pipeline is a process gas pipeline, which mainly contains H2, CO, and a very small amount of ammonia and sulfide. The flange is 6 inches, 600 pounds, made of 304 material, thickness 10.9mm, cracks on the neck, length 40mm. The flange neck cracked on more than one occasion. Please analyze the reasons, thank you.
Check the chemical composition and metallographic structure.
Hydrogen must be eliminated before welding and heat treated after welding.
Looking at the media composition, it is most likely stress corrosion cracking. It is recommended to conduct a comprehensive analysis from the media components, working conditions, materials and welding.
oh. 304 is hydrogen, does it not need to eliminate hydrogen?
Such problems with forgings are often caused by the forgings themselves.
It’s hard to describe the quality of today’s forgings