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51318-10877-High Temperature Alloys Failures in the Petrochemical Furnaces. Mitigation and Prevention

Picture for High Temperature Alloys Failures in the Petrochemical Furnaces. Mitigation and Prevention
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This paper explains the most common damage mechanisms of high temperature alloys in radiant section such as creep/carburization, thermal fatigue/carburization, and thermal shock.

 

Product Number: 51318-10877-SG
Author: Ali H. AlShawaf / Manabendra K. Maity
Publication Date: 2018
Industry: Petroleum Refining
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High temperature alloys tubes are used in the hottest section in the radiant box of petrochemical furnaces commonly known as ethylene furnaces or fired heaters. Many metallurgical improvements to these alloys are intended so the material can withstand the elevated temperature and aggressive environment to obtain a longer operation time. This paper explains the most common damage mechanisms of these alloys in radiant section such as creep/carburization, thermal fatigue/carburization, and thermal shock. State of the art analytical techniques such as macro-etching of carburization depth, optical microscope, scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray fluorescence (XRF) were utilized in analyzing these failures. Preventive solutions were recommended to overcome such failures in the future and ultimately increase the operation time and most importantly increase the production rate.

Key words: High temperature oxidation attack, Nitriding, Carburization, Tube bulging, High grade austenitic alloys, High temperature applications.

High temperature alloys tubes are used in the hottest section in the radiant box of petrochemical furnaces commonly known as ethylene furnaces or fired heaters. Many metallurgical improvements to these alloys are intended so the material can withstand the elevated temperature and aggressive environment to obtain a longer operation time. This paper explains the most common damage mechanisms of these alloys in radiant section such as creep/carburization, thermal fatigue/carburization, and thermal shock. State of the art analytical techniques such as macro-etching of carburization depth, optical microscope, scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray fluorescence (XRF) were utilized in analyzing these failures. Preventive solutions were recommended to overcome such failures in the future and ultimately increase the operation time and most importantly increase the production rate.

Key words: High temperature oxidation attack, Nitriding, Carburization, Tube bulging, High grade austenitic alloys, High temperature applications.

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51318-11046-The investigation of Incoloy 800H Relaxation Crack Mechanisms

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Author: Yunjo Ro / Ihho Park / Gyutae Park / Jaewoong Kim
Publication Date: 2018
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In the present study, detailed microstructure of the crack-tip region of a failed tube was examined using SEM, TEM and EBSD to clarify the relaxation crack mechanism.  Details of the microstructural findings and a proposed mechanism of stress relief cracking will be discussed.

 
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