Electron-Microprobe Study of Scale Formations on Cr-Mo Superheater Tubing After Long-Time Exposure to 2000 Psi Steam of 1100 F and 1200 F

[+] Author and Article Information
F. Eberle

The Babcock & Wilcox Company, Research Center, Alliance, Ohio

J. L. McCall

Battelle Memorial Institute, Columbus, Ohio

J. Eng. Power 87(2), 205-209 (Apr 01, 1965) (5 pages) doi:10.1115/1.3678171 History: Received June 08, 1964; Online January 10, 2012


Metallographically polished sections through the steam-scaled inside surface of 2-in-od × 0.50-in-wall superheater tubing used in ASME High Temperature Steam Research Tests were subjected to electron-microprobe analyses and the concentrations of iron, manganese, silicon, chromium, and molybdenum determined at intervals of 8 to 15 microns (0.3 to 0.6 mil) across the scale thicknesses and in the adjacent tube metal. The relationships between base-metal composition, scale composition, and scale thickness were examined as a function of temperature and time of exposure. The suitability and value of the electron-microprobe as a research tool for studying mechanisms of scaling behavior and scale formations are outlined.

Copyright © 1965 by ASME
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