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ASTM B424 (Ni-Fe-Cr-Mo-Cu alloy, Incoloy 825)
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Search Results for ASTM B424 (Ni-Fe-Cr-Mo-Cu alloy, Incoloy 825)
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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001814
EISBN: 978-1-62708-241-9
... to the high-temperature degradation were also analyzed and are discussed. pressure vessel fracture overtemperature steel bulging rupture x-ray diffraction analysis fracture toughness SA387 grade 11 class 2 (1.25Cr-0.5Mo chromium-molybdenum alloy steel) ASTM B424 (Ni-Fe-Cr-Mo-Cu alloy, Incoloy...
Abstract
A pressure vessel failed causing an external fire on a nine-story coke gasifier in a refinery power plant. An investigation revealed that the failure began as cracking in the gasifier internals, which led to bulging and stress rupture of the vessel shell, and the escape of hot syngas, setting off the fire. The failure mechanisms include stress relaxation cracking of a large diameter Incoloy 825 tube, stress rupture of a 4.65 in. thick chromium steel shell wall, and the oxidation of chromium steel exposed to hot syngas. The gasifier process and operating conditions that contributed to the high-temperature degradation were also analyzed and are discussed.
