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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
1
ISBN electronic:
978-1-62708-214-3
Publication date:
1992
Book Chapter

High-Temperature Failure by Perforation of Incoloy 800H Pigtails in Reformer Furnaces

By
Sergio N. Monteiro
Sergio N. Monteiro
COPPE—Federal University of Rio de Janeiro
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Published:
1992
Page range:
354 - 357

Abstract

The curved parts of exit pigtails made of wrought Incoloy 800H tubing used in steam reforming furnaces failed by performance after a period of service shorter than that predicted by the designers. Examination of a set of tubes consisting of both curved (perforated) and straight parts revealed that the cracks initiated at the outer surface by a combined mechanism of creep and intergranular embrittlement. A smaller grain size resulting from cold bending fabrication procedures for the curved parts was responsible for accelerating the embrittlement. It was recommended that hot bending be used for fabrication of the curved parts. A change of alloy to a low-alloy chromium-molybdenum allay to protect against heat was also suggested.

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Sergio N. Monteiro, 1992. "High-Temperature Failure by Perforation of Incoloy 800H Pigtails in Reformer Furnaces", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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