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02373 CARBURIZATION BEHAVIOUR OF NICKEL- AND IRON-BASE ALLOYS IN THE TEMPERATURE RANGE 550 - 1200 °C

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Product Number: 51300-02373-SG
ISBN: 02373 2002 CP
Author: U. Brill and D.C. Agarwal
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Besides oxygen attack, at high service temperatures high temperature materials are frequently subject to attack by carbon. The carbon is usually formed by decomposition of hydrocarbons, carbon monoxide and carbon dioxide and diffuses into the material via the grain boundaries, where rapid diffusion of the carbon atoms takes place. The pick-up of carbon by the material may, inter alia, affect its mechanical properties and corrosion resistance. Therefore a wide variety of commercially available Ni- and Fe-base alloys were tested in a CH4/H2 gas mixture with a constant carbon activity of ac = 0.8 in the temperature range 550- 1200 °C. The tests were carried out in a 24-h cycle with a total test time of more than 1,000 hours. The weight change was determined and the average value for three tested specimens per alloy and test temperature was plotted versus time. This paper summarizes and compares the results with special emphasis on the influence of alloying elements on carburization resistance. The beneficial influence of nickel, molybdenum, silicon and aluminium could be proved for the prevailing environmental conditions. Keywords: Carburization, Ni-base alloys, Fe-base alloys, Temperature Dependency of Carburization, Influence of Composition on Carburization
Besides oxygen attack, at high service temperatures high temperature materials are frequently subject to attack by carbon. The carbon is usually formed by decomposition of hydrocarbons, carbon monoxide and carbon dioxide and diffuses into the material via the grain boundaries, where rapid diffusion of the carbon atoms takes place. The pick-up of carbon by the material may, inter alia, affect its mechanical properties and corrosion resistance. Therefore a wide variety of commercially available Ni- and Fe-base alloys were tested in a CH4/H2 gas mixture with a constant carbon activity of ac = 0.8 in the temperature range 550- 1200 °C. The tests were carried out in a 24-h cycle with a total test time of more than 1,000 hours. The weight change was determined and the average value for three tested specimens per alloy and test temperature was plotted versus time. This paper summarizes and compares the results with special emphasis on the influence of alloying elements on carburization resistance. The beneficial influence of nickel, molybdenum, silicon and aluminium could be proved for the prevailing environmental conditions. Keywords: Carburization, Ni-base alloys, Fe-base alloys, Temperature Dependency of Carburization, Influence of Composition on Carburization
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03474 Alloy Carburization at Temperatures of 1,200 - 2,100°F (650 - 1,150°C)

Product Number: 51300-03474-SG
ISBN: 03474 2003 CP
Author: R. C. John, A. D. Pelton, A. L. Young, P. Spencer, W. T. Thompson
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98431 COMPARATIVE CARBURIZATION OF HEAT RESISTANT ALLOYS

Product Number: 51300-98431-SG
ISBN: 98431 1998 CP
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02386 A NEW CARBURIZATION RESISTANT ALLOY FOR ETHYLENE PYROLYSIS FURNACE TUBES

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. Laboratory corrosion tests have been carried out to evaluate carburization resistance of the developed alloy.
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