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02386 A NEW CARBURIZATION RESISTANT ALLOY FOR ETHYLENE PYROLYSIS FURNACE TUBES

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.

Product Number: 51300-02386-SG
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. At temperatures between 1000°C and 1150°C, laboratory corrosion tests have been Carried out to evaluate carburization resistance of the developed alloy. Commercial austenitic stainless steels used for furnace tubes were tested for comparison. In a simulated carburizing environment of 15vol%CH4-3%CO2-82%H2 gas mixture, the developed alloy has a three times better carburization resistance than the conventional austenitic stainless steels containing more than 25mass% chromium and high silicon at evaluated temperatures. Another laboratory test has been conducted to clarify carburization and coking resistance under conditions of cyclic carburization and oxidation environments. Carbon ingress and coke deposition of conventional alloys forming chromium oxide scale increased with increasing heat cycles, whereas the developed alloy remained unchanged. Based on these results, carburization and coking behavior of alloys used as ethylene pyrolysis furnace tubes has been explained. Keywords: ethylene pyrolysis, hydrocarbon, high temperature, carburization, coke, coking, aluminum, alumina, oxide, carbide, model

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. At temperatures between 1000°C and 1150°C, laboratory corrosion tests have been Carried out to evaluate carburization resistance of the developed alloy. Commercial austenitic stainless steels used for furnace tubes were tested for comparison. In a simulated carburizing environment of 15vol%CH4-3%CO2-82%H2 gas mixture, the developed alloy has a three times better carburization resistance than the conventional austenitic stainless steels containing more than 25mass% chromium and high silicon at evaluated temperatures. Another laboratory test has been conducted to clarify carburization and coking resistance under conditions of cyclic carburization and oxidation environments. Carbon ingress and coke deposition of conventional alloys forming chromium oxide scale increased with increasing heat cycles, whereas the developed alloy remained unchanged. Based on these results, carburization and coking behavior of alloys used as ethylene pyrolysis furnace tubes has been explained. Keywords: ethylene pyrolysis, hydrocarbon, high temperature, carburization, coke, coking, aluminum, alumina, oxide, carbide, model

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