Failure Investigation of a High-Temperature Cast Soot Blower Lance Tube Nozzle

Failure in the form of stress corrosion cracking has occurred on the SS304 lance tube soot blower. The hardness test showed high value for the area close to the failed region. The SEM test showed formation of heterogonous and porosity film on the surface. XRD indicated that the oxides determined wer...

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Veröffentlicht in:	Journal of failure analysis and prevention 2020-08, Vol.20 (4), p.1124-1129
Hauptverfasser:	Fatah, M. C., Putra, D. T., Kurniawan, B. A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Characterization and Evaluation of Materials Chemistry and Materials Science Chlorine Classical Mechanics Concentrators Corrosion and Coatings Failure investigations Flue gas Hardness tests High temperature Iron oxides Low temperature Materials Science Nozzles Porosity Quality Control Reliability Safety and Risk Solid Mechanics Soot Stress corrosion cracking Technical Article > -Peer-Reviewed Tribology
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Zusammenfassung:	Failure in the form of stress corrosion cracking has occurred on the SS304 lance tube soot blower. The hardness test showed high value for the area close to the failed region. The SEM test showed formation of heterogonous and porosity film on the surface. XRD indicated that the oxides determined were Fe 2 O 3 and Fe 3 O 4 . Metallographic of the lance tube revealed pitting as the stress concentrator. Pitting is caused by chloride (as chlorine) and SO 2− from the flue gas. SO 2− reacts with water to form acidic sodium bisulfate (NaHSO 4 ). Stress is generated from exposure of lance tube parts to high and low temperature during its service.
ISSN:	1547-7029 1728-5674 1864-1245
DOI:	10.1007/s11668-020-00914-w