Corrosion testing of high-nickel alloy composite tube materials in simulated recovery boiler lower furnace conditions

Martti Mäkipää, Maria Oksa, Pekka Pohjanne

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

Abstract

High-nickel alloys like Alloy 825 and Alloy 625 have been found very promising as substitutes for 304L austenitic stainless steel composite tubing commonly used in recovery boiler lower furnace water-wall panels. High-nickel alloys may be applied as outer layers of composite tubing or as weld overlays. As compared to austenitic stainlesss steels they possess higher yield strength at elevated temperatures and their thermal expansion coefficient is as closer to that of carbon steel. These properties make them, as compared to type 304L austenitic stainless steel, less prone to thermal fatigue or stress corrosion cracking. However, because of the high-nickel content, their sulphidation resistance has been questioned. This paper reports about recent results of comparative laboratory testing of sulphidation and stress corrosion cracking susceptibility of some candidate high-nickel alloys. Laboratory testing performed under simulated lower furnace environments at exposure temperatures of 360oC and higher indicate that corrosion and stress corrosion cracking resistance of high-nickel alloys of type 625 is superior to austenitic stainless steel of type 304L under normal lower furnace operation conditions. Corrosion resistance of Alloy 825 as compared to austenitic stainless steel of type 304 L varies depending on the detailed environmental conditions. Testing programme will be continued and extended to higher temperatures and more aggressive chemical conditions.
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
Pages73-88
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

Nickel alloys
Austenitic stainless steel
Boilers
Furnaces
Stress corrosion cracking
Corrosion
Recovery
Composite materials
Testing
Tubing
Thermal fatigue
Austenitic steel
Thermal stress
Temperature
Carbon steel
Thermal expansion
Yield stress
Corrosion resistance
Welds
Nickel

Cite this

Mäkipää, M., Oksa, M., & Pohjanne, P. (2001). Corrosion testing of high-nickel alloy composite tube materials in simulated recovery boiler lower furnace conditions. In 10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI. Vol. 1 (pp. 73-88). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 214
Mäkipää, Martti ; Oksa, Maria ; Pohjanne, Pekka. / Corrosion testing of high-nickel alloy composite tube materials in simulated recovery boiler lower furnace conditions. 10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI. Vol. 1. Espoo : VTT Technical Research Centre of Finland, 2001. pp. 73-88 (VTT Symposium; No. 214).
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abstract = "High-nickel alloys like Alloy 825 and Alloy 625 have been found very promising as substitutes for 304L austenitic stainless steel composite tubing commonly used in recovery boiler lower furnace water-wall panels. High-nickel alloys may be applied as outer layers of composite tubing or as weld overlays. As compared to austenitic stainlesss steels they possess higher yield strength at elevated temperatures and their thermal expansion coefficient is as closer to that of carbon steel. These properties make them, as compared to type 304L austenitic stainless steel, less prone to thermal fatigue or stress corrosion cracking. However, because of the high-nickel content, their sulphidation resistance has been questioned. This paper reports about recent results of comparative laboratory testing of sulphidation and stress corrosion cracking susceptibility of some candidate high-nickel alloys. Laboratory testing performed under simulated lower furnace environments at exposure temperatures of 360oC and higher indicate that corrosion and stress corrosion cracking resistance of high-nickel alloys of type 625 is superior to austenitic stainless steel of type 304L under normal lower furnace operation conditions. Corrosion resistance of Alloy 825 as compared to austenitic stainless steel of type 304 L varies depending on the detailed environmental conditions. Testing programme will be continued and extended to higher temperatures and more aggressive chemical conditions.",
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Mäkipää, M, Oksa, M & Pohjanne, P 2001, Corrosion testing of high-nickel alloy composite tube materials in simulated recovery boiler lower furnace conditions. 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. 73-88, 10th International Symposium On corrosion in the Pulp and Paper Industry, ISCPPI , Helsinki, Finland, 21/08/01.

Corrosion testing of high-nickel alloy composite tube materials in simulated recovery boiler lower furnace conditions. / Mäkipää, Martti; Oksa, Maria; Pohjanne, Pekka.

10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI. Vol. 1. Espoo : VTT Technical Research Centre of Finland, 2001. p. 73-88 (VTT Symposium; No. 214).

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

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T1 - Corrosion testing of high-nickel alloy composite tube materials in simulated recovery boiler lower furnace conditions

AU - Mäkipää, Martti

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N2 - High-nickel alloys like Alloy 825 and Alloy 625 have been found very promising as substitutes for 304L austenitic stainless steel composite tubing commonly used in recovery boiler lower furnace water-wall panels. High-nickel alloys may be applied as outer layers of composite tubing or as weld overlays. As compared to austenitic stainlesss steels they possess higher yield strength at elevated temperatures and their thermal expansion coefficient is as closer to that of carbon steel. These properties make them, as compared to type 304L austenitic stainless steel, less prone to thermal fatigue or stress corrosion cracking. However, because of the high-nickel content, their sulphidation resistance has been questioned. This paper reports about recent results of comparative laboratory testing of sulphidation and stress corrosion cracking susceptibility of some candidate high-nickel alloys. Laboratory testing performed under simulated lower furnace environments at exposure temperatures of 360oC and higher indicate that corrosion and stress corrosion cracking resistance of high-nickel alloys of type 625 is superior to austenitic stainless steel of type 304L under normal lower furnace operation conditions. Corrosion resistance of Alloy 825 as compared to austenitic stainless steel of type 304 L varies depending on the detailed environmental conditions. Testing programme will be continued and extended to higher temperatures and more aggressive chemical conditions.

AB - High-nickel alloys like Alloy 825 and Alloy 625 have been found very promising as substitutes for 304L austenitic stainless steel composite tubing commonly used in recovery boiler lower furnace water-wall panels. High-nickel alloys may be applied as outer layers of composite tubing or as weld overlays. As compared to austenitic stainlesss steels they possess higher yield strength at elevated temperatures and their thermal expansion coefficient is as closer to that of carbon steel. These properties make them, as compared to type 304L austenitic stainless steel, less prone to thermal fatigue or stress corrosion cracking. However, because of the high-nickel content, their sulphidation resistance has been questioned. This paper reports about recent results of comparative laboratory testing of sulphidation and stress corrosion cracking susceptibility of some candidate high-nickel alloys. Laboratory testing performed under simulated lower furnace environments at exposure temperatures of 360oC and higher indicate that corrosion and stress corrosion cracking resistance of high-nickel alloys of type 625 is superior to austenitic stainless steel of type 304L under normal lower furnace operation conditions. Corrosion resistance of Alloy 825 as compared to austenitic stainless steel of type 304 L varies depending on the detailed environmental conditions. Testing programme will be continued and extended to higher temperatures and more aggressive chemical conditions.

M3 - Conference article in proceedings

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Mäkipää M, Oksa M, Pohjanne P. Corrosion testing of high-nickel alloy composite tube materials in simulated recovery boiler lower furnace conditions. In 10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI. Vol. 1. Espoo: VTT Technical Research Centre of Finland. 2001. p. 73-88. (VTT Symposium; No. 214).