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Journal of Failure Analysis and Prevention

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01-10-2007 | Peer Reviewed

Stress Assisted Corrosion of Waterwall Tubes in Recovery Boiler Tubes: Failure Analysis

Authors: Preet M. Singh, Jamshad Mahmood

Published in: Journal of Failure Analysis and Prevention | Issue 5/2007

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Abstract

Waterside cracking of carbon-steel boiler tubes is one of the major safety and efficiency concerns in kraft recovery boilers in the pulp and paper industry, because any water leak into the furnace could cause a smelt-water explosion in the boiler. Failed carbon-steel boiler tubes from different kraft recovery boilers were examined to understand the role of carbon-steel microstructure on crack initiation and crack morphology. A number of carbon-steel tubes showed a deep decarburized layer on the inner surface (water-touched) and also an unusually large grain size at the inner tube surface. In some boiler tubes, cracks were found to initiate in areas with large-grained-decarburized microstructure. However, tubes without such microstructure were also found to have stress assisted corrosion (SAC) cracks. It was found that the decarburization and large grained microstructure may facilitate initiation and growth, but it is not necessary for SAC of carbon-steel boiler tubes.

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Title: Stress Assisted Corrosion of Waterwall Tubes in Recovery Boiler Tubes: Failure Analysis
Authors: Preet M. Singh
Jamshad Mahmood
Publication date: 01-10-2007
Publisher: Springer US
Published in: Journal of Failure Analysis and Prevention / Issue 5/2007
Print ISSN: 1547-7029
Electronic ISSN: 1864-1245
DOI: https://doi.org/10.1007/s11668-007-9063-z

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