Failure Analysis Case History No. 007

Industry: Chemical Process
Specimen Description: 310 stainless steel thermal oxidizer rain hat
Material: 310 stainless steel
Environment: Atmospheric with hot oxidizer flue gases
A 310 stainless steel "rain hat" shielding the opening of a thermal oxidizer flue gas stack failed from cracking at attachement welds while in service.
Time in Service: Unknown
Laboratory failure analysis results showed that failure of the 310 stainless steel rain hat was due to hot cracking and lack of fusion of the attachment welds. Many polythionic acid stress corrosion cracks were also observed in the microstructure. It was believed the polythionic acid stress corrosion cracking occurred when sulfur containing flue gases condensed on the rain hat.


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