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99269 CARBURIZATION OF EMERGING MATERIALS

Picture for 99269 CARBURIZATION OF EMERGING MATERIALS
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Product Number: 51300-99269-SG
ISBN: 99269 1999 CP
Author: Rob Milner
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The carburization resistance of two emerging alloys for ethylene pyrolysis service was investigated and compared with that of two existing alloys. One of the emerging alloys, alloy U, contained about 40% chromium and 50% nickel by weight and was similar to existing alloys in terms of microstructure and strengthening mechanisms. The other emerging alloy, known as ExoAlloy , was based on the Ni3Al nickel aluminide system. Nickel aluminizes have outstanding creep rupture strengths compared to other cast alloys. Their carburization resistance, however, has not yet been compared to standard alloys in a manner that is consistent with standard industrial test methods. In this paper a comparison is made of the carburization resistance of the two emerging and two existing materials. In addition, a brief analysis of the expected furnace life was made, based on both the strength and carburization resistance of the four materials. It was found that one emerging material, alloy U, would provide an exceptional increase in either the furnace life or the operating temperature of the furnace coil. The nickel aluminide alloy would also be expected to provide increased furnace coil life, but does not allow a large increase in furnace operating temperature. KEYWORDS heat resistant, carburization, ethylene, pyrolysis, cracking, nickel aluminide, Ni3Al
The carburization resistance of two emerging alloys for ethylene pyrolysis service was investigated and compared with that of two existing alloys. One of the emerging alloys, alloy U, contained about 40% chromium and 50% nickel by weight and was similar to existing alloys in terms of microstructure and strengthening mechanisms. The other emerging alloy, known as ExoAlloy , was based on the Ni3Al nickel aluminide system. Nickel aluminizes have outstanding creep rupture strengths compared to other cast alloys. Their carburization resistance, however, has not yet been compared to standard alloys in a manner that is consistent with standard industrial test methods. In this paper a comparison is made of the carburization resistance of the two emerging and two existing materials. In addition, a brief analysis of the expected furnace life was made, based on both the strength and carburization resistance of the four materials. It was found that one emerging material, alloy U, would provide an exceptional increase in either the furnace life or the operating temperature of the furnace coil. The nickel aluminide alloy would also be expected to provide increased furnace coil life, but does not allow a large increase in furnace operating temperature. KEYWORDS heat resistant, carburization, ethylene, pyrolysis, cracking, nickel aluminide, Ni3Al
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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
Publication Date: 2002
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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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