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51314-4202-Failures of High Temperature Alloys in Ethylene Furnaces – Case Studies

Picture for Failures of High Temperature Alloys in Ethylene Furnaces – Case Studies
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Product Number: 51314-4202-SG
ISBN: 4202 2014 CP
Author: Slawomir Kus
Publication Date: 2014
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High temperature stainless steels and nickel alloys are successfully used in many areas of ethylene cracking furnaces. Although resistant to various types of corrosion e.g. high temperature oxidation or creep under certain conditions those materials are susceptible to stress corrosion cracking phenomenon.The following paper reviews failures of tubes and supporting pipelines made of austenitic stainless steel ASTM A312-TP321H and nickel alloy 800H (ASTM B407 UNS N 08810) that occurred in ethylene furnaces. Damages of bent ethane inlet coils (pig-tail type) made of ASTM A312-TP321H and “pressure gauge tap” lines made of alloy 800H have been investigated. All failed elements were located outside the firebox with operating temperature below 700C. Metallurgical analysis revealed stress-assisted corrosion as a major damage mechanism. Residual stress originated either from design or fabrication process accompanied by severe carburization was recognized as a driving force responsible for observed failures.Key words: ethylene furnaces stress corrosion cracking carburization ASTM A312 - 321H alloy 800H 
High temperature stainless steels and nickel alloys are successfully used in many areas of ethylene cracking furnaces. Although resistant to various types of corrosion e.g. high temperature oxidation or creep under certain conditions those materials are susceptible to stress corrosion cracking phenomenon.The following paper reviews failures of tubes and supporting pipelines made of austenitic stainless steel ASTM A312-TP321H and nickel alloy 800H (ASTM B407 UNS N 08810) that occurred in ethylene furnaces. Damages of bent ethane inlet coils (pig-tail type) made of ASTM A312-TP321H and “pressure gauge tap” lines made of alloy 800H have been investigated. All failed elements were located outside the firebox with operating temperature below 700C. Metallurgical analysis revealed stress-assisted corrosion as a major damage mechanism. Residual stress originated either from design or fabrication process accompanied by severe carburization was recognized as a driving force responsible for observed failures.Key words: ethylene furnaces stress corrosion cracking carburization ASTM A312 - 321H alloy 800H 
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02386 A NEW CARBURIZATION RESISTANT ALLOY FOR ETHYLENE PYROLYSIS FURNACE TUBES

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ISBN: 02386 2002 CP
Author: Y.Nishiyama, H.Semba, K.Ogawa, Y.Yamadera, Y.Sawaragi, and S.Kinomura
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A new wrought alloy has been developed for use as furnace tubes in ethylene pyrolysis plants. This alloy has an excellent carburization resistance due to uniform formation of protective Al2O3 oxide scale on the metal surface. Laboratory corrosion tests have been carried out to evaluate carburization resistance of the developed alloy.
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