Abstract
In response to the crack failure phenomenon of the lower flange cover of a butane spherical tank in a certain petrochemical company, the failure reason was analyzed through macroscopic observation, material analysis, scanning electron microscopy analysis, metallographic test analysis, impact test analysis, etc. The results show that the fillet weld of the flange cover is a stress concentration area, and after a period of use, the internal stress gradually releases. In addition, the internal dislocations in the grains gather, causing cracks to initiate from within the grains and gradually delay the occurrence of cracks, leading to brittle fracture failure of the flange cover.
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