OXIDATION OF 1% Cr, 0.5% Mo STEEL IN CARBON DIOXIDE

Technical Report · Thu Jun 01 04:00:00 EDT 1961

OSTI ID:4829749

Draycott, A; Hubery, R W

The corrosion of a 1% Cr, 0.5% Mo steel in carbon dioxide was measured over the range 450 to 525 deg C under varying conditions of surface preparation, pressure, velocity, and impurity content of the gas. Weight changes were measured as a function of time of exposure in tests of up to 4000 hr. It was found that surface preparation of the specimnens and pressure of the gas have littie effect on the rate of oxidation of this steel in CO/sub 2/. Also presence of moisture up to 20000 ppm does not materially alter the rate of attack. Weight-gains of specimens in pure oxygen were always found to be less than weight- gains obtained in carbon dioxide under identical conditions of temperature, pressure, and moisture content. Scaling of the oxide layer was never encountered under static or semi-static conditions. However, scaling occurred on many specimens exposed in flowing gas; the extent depended on the temperature and gas velocity. Metallographic examination verified that a protective Cr/sub 2/O/sub3/ film was never likely to be formed on this steel under the conditions of the tests. The major products of the reaction were Fe/sub 3/O/sub 4/ and another unidentified spinel. This study has shown that it is not safe to recommend this steel for use in carbon dioxide cooled reactors at temperatures above 450 deg C. (auth)

• Research Organization: Australia. Atomic Energy Commission Research Establishment, Lucas Heights, New South Wales
• NSA Number: NSA-16-002131
• OSTI ID: 4829749
• Report Number(s): AAEC/E-71
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CARBON DIOXIDE
CHROMIUM ALLOYS
CHROMIUM OXIDES
CORROSION
FILMS
HUMIDITY
IMPURITIES
IRON OXIDES
MEASURED VALUES
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
OXYGEN
PRESSURE
STEELS
SURFACES
TEMPERATURE
VELOCITY
WEIGHT