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ASM Failure Analysis Case Histories

Handbook of Case Histories in Failure Analysis

Edited by
Khlefa A. Esaklul
Khlefa A. Esaklul
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ASM International
Volume
2
ISBN electronic:
978-1-62708-215-0
Publication date:
1993
Book Chapter

Thermal Fatigue Failure of Alloy UNS NO8800 Steam Superheating Tubes

By
Moavinul Islam
Moavinul Islam
CC Technologies
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Published:
1993
Page range:
235 - 239

Abstract

Alloy UNS N08800 (Alloy 800) tubes of the steam superheating coils of two hydrocracker charge heaters in a refinery failed prematurely in service. Failure analysis of the tubes indicated that the failures could be attributed to thermal fatigue as a result of temperature fluctuations as well as restriction to movement. Fatigue cracks initiated intergranularly from both the flue gas and steam sides. Enhanced general and grain boundary oxidation coupled with age hardening of the alloy led to the formation of incipient intergranular cracks that acted as sites for the initiation of the fatigue cracks.

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Moavinul Islam, 1993. "Thermal Fatigue Failure of Alloy UNS NO8800 Steam Superheating Tubes", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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