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Effect of a high heat flux on the corrosion of 2 1/4 Cr-1 Mo steel in superheated steam [electronic resource].

Published
Oak Ridge, Tenn. : Oak Ridge National Laboratory, 1977.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 24 : digital, PDF file
Additional Creators
Oak Ridge National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
A series of corrosion tests was conducted to determine the effect of heat flux on the corrosion of 2/sup 1///sub 4/ Cr-1 Mo steel in superheated steam. The tests were conducted with a constant heat flux of (126 kW/m/sup 2/) 40,000 Btu hr/sup -1/ ft/sup -2/ and surface temperatures varying from 950 to 1000/sup 0/F (510 to 541/sup 0/C) on each specimen. Specimens were exposed for varying lengths of time, ranging from 500 to 6000 hr. Essentially all the corrosion product oxide remained on the steel during the first 2000 hr, but after that time, exfoliation of the oxide began. The percentage of corrosion product oxide lost from the specimen increased with exposure time; about 33 percent was missing after 6000 hr. After an initial period of rapid corrosion, the average corrosion rate was constant at 1.8 mils/year (45 ..mu..m/year). In contrast, isothermal specimens exposed to superheated steam at 930/sup 0/F (499/sup 0/C) in the same test facility corroded at a decreasing rate throughout the test. Metallographic sections showed that, with heat transfer across the specimen-steam interface, both cracks and porosity developed in the oxide, even on short exposure, a face that was undoubtedly responsible for the early exfoliation of the oxide and the constant corrosion rate.
Report Numbers
E 1.99:conf-770303-12
conf-770303-12
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
01/01/1977.
"conf-770303-12"
Corrosion/77 NACE meeting, San Francisco, CA, USA, 14 Mar 1977.
DeVan, J H; Griess, J C; Maxwell, W A.
Funding Information
W-7405-ENG-26
View MARC record | catkey: 14460741