Oxidation Rate of Advanced Heat-Resistant Steels for Ultra-Supercritical Boilers in Pressurized Superheated Steam

[+] Author and Article Information
Yong-Sun Yi, Yutaka Watanabe, Tatsuo Kondo

Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

Hiroshi Kimura, Minoru Sato

Thermal Power Planning Group, Thermal Power Engineering Department, Tohoku Electric Power Company, Sendai 980-8550, Japan

J. Pressure Vessel Technol 123(3), 391-397 (Feb 28, 2001) (7 pages) doi:10.1115/1.1373656 History: Received April 17, 2000; Revised February 28, 2001
Copyright © 2001 by ASME
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Schematics of the autoclave system for steam oxidation experiments
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Examples of weight gain behavior at (a) 700°C, and (b) 600°C
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Material dependencies of oxidation rate constant, Kp, for 700 and 600°C. Kp values are plotted as a function of the bulk Cr content in the materials.
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Cross-sectional SEM images of oxide scales formed at 700°C/10 MPa—(a) HCM2S, (b) NF616, and (c) HCM12A
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Compositional profiles of oxide scales formed at 700°C/10 MPa—(a) HCM2S, (b) NF616, and (c) HCM12A
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Maximum Cr concentrations in the inner layer scales plotted as a function of testing temperature
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Correlation between Kp and the maximum Cr concentration in the inner layer scales
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Arrhenius-type plots of Kp measured at (a) 10 MPa and (b) 2 MPa or lower
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Kp plotted as a function of pressure for (a) 700°C case, and (b) 600°C case
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Pre-aging effect on Kp for NF616 (Heat-B) at 700°C/2 Mpa




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