Abstract
A failure analysis was performed on a cracked handhole flange. Through the analysis of the macro morphology and microstructure of the crack, the metallographic analysis, the mechanical properties test, the chemical compositions analysis of flange material, and the energy spectrum test, the main reason for the cracking can be described as liquation crack, and the failure was aggravated by the sensitization of flange materials. Conclusions and corresponding preventive measures were put forward. • Failure analysis revealed that handhole flange cracking was caused by the liquation crack. • The liquation crack was caused by the low-melting point annular oxide inclusions and silicate eutectic. • Sensitization is another reason of the handhole flange cracking.
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