Cracking of recovery boiler composite tubes: Thermal fatigue or stress corrosion cracking?

Hannu Hänninen, Pekka Pohjanne, Pekka Saarinen, Kiesi

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

In the composite tubes of black liquor recovery boilers cracking and corrosion attack has been observed, especially in the floor tubes. Cracks typically initiate in the stainless steel cladding and penetrate through the cladding to the stainless steel/low alloy steel interface, where the cracks normally propagate along the interface and do not penetrate to the low alloy steel. Cracking occurs also on lower walls, smelt spout openings and air ports and sometimes penetration to low alloy steel base metal has also occurred. The cracking mechanism has been suggested to be either stress corrosion cracking or thermal fatigue. A special case of cracking has been the situation where cracks are present on the inner surface of the tubes, when cracking is also starting from the water side. The environmental, thermal, mechanical and metallurgical effects on these cracking phenomena are evaluated based on these two different mechanisms of cracking. Special attention is paid to the possible methods for mitigation of the recovery boiler cracking failures, e.g. by operating procedures or materials selection.
Original languageEnglish
Title of host publication10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI. Vol. 1
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages103-116
ISBN (Electronic)951-38-5724-7
ISBN (Print)951-38-5720-4
Publication statusPublished - 2001
MoE publication typeA4 Article in a conference publication
Event10th International Symposium On corrosion in the Pulp and Paper Industry, ISCPPI - Helsinki, Finland
Duration: 21 Aug 200124 Aug 2001

Publication series

SeriesVTT Symposium
Number214
ISSN0357-9387

Conference

Conference10th International Symposium On corrosion in the Pulp and Paper Industry, ISCPPI
Abbreviated title10th ISCPPI
CountryFinland
CityHelsinki
Period21/08/0124/08/01

Fingerprint

Thermal fatigue
Stress corrosion cracking
High strength steel
Thermal stress
Boilers
Cracks
Recovery
Composite materials
Stainless steel
Corrosion
Air
Metals
Water

Cite this

Hänninen, H., Pohjanne, P., Saarinen, P., & Kiesi (2001). Cracking of recovery boiler composite tubes: Thermal fatigue or stress corrosion cracking? In 10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI. Vol. 1 (pp. 103-116). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 214
Hänninen, Hannu ; Pohjanne, Pekka ; Saarinen, Pekka ; Kiesi. / Cracking of recovery boiler composite tubes : Thermal fatigue or stress corrosion cracking?. 10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI. Vol. 1. Espoo : VTT Technical Research Centre of Finland, 2001. pp. 103-116 (VTT Symposium; No. 214).
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title = "Cracking of recovery boiler composite tubes: Thermal fatigue or stress corrosion cracking?",
abstract = "In the composite tubes of black liquor recovery boilers cracking and corrosion attack has been observed, especially in the floor tubes. Cracks typically initiate in the stainless steel cladding and penetrate through the cladding to the stainless steel/low alloy steel interface, where the cracks normally propagate along the interface and do not penetrate to the low alloy steel. Cracking occurs also on lower walls, smelt spout openings and air ports and sometimes penetration to low alloy steel base metal has also occurred. The cracking mechanism has been suggested to be either stress corrosion cracking or thermal fatigue. A special case of cracking has been the situation where cracks are present on the inner surface of the tubes, when cracking is also starting from the water side. The environmental, thermal, mechanical and metallurgical effects on these cracking phenomena are evaluated based on these two different mechanisms of cracking. Special attention is paid to the possible methods for mitigation of the recovery boiler cracking failures, e.g. by operating procedures or materials selection.",
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Hänninen, H, Pohjanne, P, Saarinen, P & Kiesi 2001, Cracking of recovery boiler composite tubes: Thermal fatigue or stress corrosion cracking? in 10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI. Vol. 1. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 214, pp. 103-116, 10th International Symposium On corrosion in the Pulp and Paper Industry, ISCPPI , Helsinki, Finland, 21/08/01.

Cracking of recovery boiler composite tubes : Thermal fatigue or stress corrosion cracking? / Hänninen, Hannu; Pohjanne, Pekka; Saarinen, Pekka; Kiesi.

10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI. Vol. 1. Espoo : VTT Technical Research Centre of Finland, 2001. p. 103-116 (VTT Symposium; No. 214).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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T1 - Cracking of recovery boiler composite tubes

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AU - Pohjanne, Pekka

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N2 - In the composite tubes of black liquor recovery boilers cracking and corrosion attack has been observed, especially in the floor tubes. Cracks typically initiate in the stainless steel cladding and penetrate through the cladding to the stainless steel/low alloy steel interface, where the cracks normally propagate along the interface and do not penetrate to the low alloy steel. Cracking occurs also on lower walls, smelt spout openings and air ports and sometimes penetration to low alloy steel base metal has also occurred. The cracking mechanism has been suggested to be either stress corrosion cracking or thermal fatigue. A special case of cracking has been the situation where cracks are present on the inner surface of the tubes, when cracking is also starting from the water side. The environmental, thermal, mechanical and metallurgical effects on these cracking phenomena are evaluated based on these two different mechanisms of cracking. Special attention is paid to the possible methods for mitigation of the recovery boiler cracking failures, e.g. by operating procedures or materials selection.

AB - In the composite tubes of black liquor recovery boilers cracking and corrosion attack has been observed, especially in the floor tubes. Cracks typically initiate in the stainless steel cladding and penetrate through the cladding to the stainless steel/low alloy steel interface, where the cracks normally propagate along the interface and do not penetrate to the low alloy steel. Cracking occurs also on lower walls, smelt spout openings and air ports and sometimes penetration to low alloy steel base metal has also occurred. The cracking mechanism has been suggested to be either stress corrosion cracking or thermal fatigue. A special case of cracking has been the situation where cracks are present on the inner surface of the tubes, when cracking is also starting from the water side. The environmental, thermal, mechanical and metallurgical effects on these cracking phenomena are evaluated based on these two different mechanisms of cracking. Special attention is paid to the possible methods for mitigation of the recovery boiler cracking failures, e.g. by operating procedures or materials selection.

M3 - Conference article in proceedings

SN - 951-38-5720-4

T3 - VTT Symposium

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BT - 10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI. Vol. 1

PB - VTT Technical Research Centre of Finland

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Hänninen H, Pohjanne P, Saarinen P, Kiesi. Cracking of recovery boiler composite tubes: Thermal fatigue or stress corrosion cracking? In 10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI. Vol. 1. Espoo: VTT Technical Research Centre of Finland. 2001. p. 103-116. (VTT Symposium; No. 214).