JMMCE  Vol.9 No.8 , August 2010
Oxidation Studies of T-91 and T-22 Boiler Steels in Air at 900°C
Abstract: The oxidation behaviour of T-91 steel and T-22 steel in air has been studied under isothermal conditions at a temperature of 900°C in a cyclic manner. Oxidation kinetics was established for the T-91 steel and T-22 steel in air at 900°C under cyclic conditions for 50 cycles by thermogravimetric technique. Each cycle consisted of 1 hour heating at 900°C followed by 20 min of cooling in air. T-91 steel sample followed somewhat linear rate of oxidation while T-22 sample followed the parabolic rate law of oxidation. X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive X-ray (SEM/EDAX) techniques were used to characterise the oxide scales. T-91 steel was found to be more corrosion resistance than T- 22 steel in air oxidation for 50 cycles.
Cite this paper: D. Gond, V. Chawla, D. Puri and S. Prakash, "Oxidation Studies of T-91 and T-22 Boiler Steels in Air at 900°C," Journal of Minerals and Materials Characterization and Engineering, Vol. 9 No. 8, 2010, pp. 749-761. doi: 10.4236/jmmce.2010.98053.

[1]   J.C. Van Wortel, C.F. Etienne, F. Arav, Application of modified 9chromium steels in power generation components, in: VDEh ECSC Information Day, The Manufacture and Properties of Steel 91 for the Power Plant and Process Industries, Dusseldorf, 5th November, 1992, paper 4.2.

[2]   T. Fujita, Current progress in advanced high Cr steel for high temperature applications ISIJ Int. 32 (2) (1992) p.175.

[3]   J. Orr, A. Di Gianfrancesco, The effect of compositional variations on the properties of steel 91, in:VDEh ECSC Information Day, The Manufacture and Properties of Steel 91 for the Power Plant and Process Industries, Dusseldorf, 5th November, 1992, paper 2.4.

[4]   ASTM, Standard specification for seamless ferritic and austenitic alloy-steel boiler, superheater and heat-exchanger tubes, A 213/A 213M-90a, 1990.

[5]   ASTM, Standard specification for seamless ferritic alloy-steel pipe for hightemperature service, A 335/A 335M-95a, 1996.

[6]   R. Panton-Kent, Phase balance in 9%Cr1%Mo steel welds. TWI report, Bulletin 1, January/February 1991, p.15.

[7]   G.E. Birchenall, A brief history of the study of oxidation of metals and alloys, in: High Temperature Corrosion, Proceedings, NACE, San Diego, CA, 1981, p.3.

[8]   D.A. Jones, Principles and Prevention of Corrosion, second ed., Prentice Hall, USA, 1996.

[9]   P. Kofstad, High-temperature Corrosion, Elsevier Applied Science, London, 1988, pp. 382–385 (Chapter 11).

[10]   I. Saeki, T. Saito, R. Furuichi, M. Itoh, Growth process of protective oxides formed on type 304 and 430 stainless steels at 1273°K, Corros. Sci. 40 (8) (1998) p.1295.

[11]   S. Jianian, Z. Longjiang, L. Tiefan, High temperature oxidation of Fe–Cr alloys in wet oxygen, Oxid. Met. 48 (3, 4) (1997) p.347.

[12]   Z. Tokei, H. Viefhaus, H.J. Grabke, Initial stages of oxidation of a 9CrMoV steel: role of segregation and martensite laths, Appl. Surf. Sci. 165 (1) (2000) p. 23.

[13]   A.P. Greeff, C.W. Louw, H.C. Swart, The oxidation of industrial FeCrMo steel, Corros. Sci. 42 (10) (2000) p.1725.

[14]   A. Arztegui, T. Gomez-Acebo, F. Castro, Steam oxidation of ferritic steels: kinetics and microstructure, Bol. Soc. Esp. Ceram. Vidr. 39 (3) (2000). p. 305.

[15]   A.S. Khanna, P. Rodriguez, J.B. Gananamoorthy, Oxidation kinetics, breakaway oxidation, and inversion phenomenon in 9Cr–1Mo steels, Oxid. Met. 26 (3, 4) (1986) p.171.

[16]   Dionisio Laverde, Tomas Gomez-Acebo ,Francisco Castro, Continuous and cyclic oxidation of T-91 ferritic steel under steam, Corrosion Science 46 ,2 July 2003, pp.613–631.

[17]   X. Wu, D. Weng, Z. Chen, L. Xu, Surface Coating Technology, 140 (2001), p.231.

[18]   P. Niranatlumpong, C.B. Ponton, H.E. Evans, Oxid. Met, 53 (3–4) (2000), pp. 241-258.

[19]   Buta Singh Sidhu, S. Prakash , Performance of NiCrAlY, Ni–Cr, Stellite-6 and Ni3Al coatings in Na2SO4–60% V2O5 environment at 900°C under cyclic conditions, Surface & Coatings Technology 201,17 April 2006, pp.1643–1654.

[20]   S. Danyluk, J.Y. Park, Corrosion 35 (12) (1979) p.575.

[21]   D. Wang, Surf. Coat. Technol. 36 (1988) p.49.

[22]   S.E. Sadique, A.H. Mollah, M.S. Islam, M.M. Ali, M.H.H. Megat, S.Basri, Oxid. Met. 54 (5–6) (2000) p.385.

[23]   N.S. Bornstein, M.A. Decrescente, H.A. Roth, Proc. of Conf. on Gas Turbine Mater in the Marine Environment, MMIC-75-27, Columbus,Ohio, USA, 1975, p. 115.

[24]   U.K. Chatterjee, S.K. Bose, S.K. Roy, Environmental Degradation of Metals, Marcel Dekker, New York, 2001.

[25]   A.K. Misra, J. Electrochem. Soc. 133 (5) (1986) p.1029.