OXIDATION OF 2 1/4% Cr, 1% Mo STEEL IN CARBON DIOXIDE

Technical Report · Sat Sep 01 04:00:00 EDT 1962

OSTI ID:4770235

Draycott, A; Fox, B J

The corrosion of 21/4% Cr, 1% Mo steel in carbon dioxide was measured in the temperature range 480 to 525 deg C and the gas pressure range 0 to 225 psig. Adherent oxide scales of the Fe/sub 3/O/sub 4/- Fe/sub 2/O/sub 3/ type were formed under semi-static conditions together with an unidentified spinel. A Cr/ sub 2/O/sub 3/ film was never formed under any conditions. Weight gain depended mainly on temperature and varied little with gas pressure, surface treatment, or water content of the gas. The relationship between weight gain and time varied between parabolic and cubic from 1.7 to 5.7 mg/cm/sup 2/ after 1000 hr exposure. Estimated penetration depths after 10,000 hr ranged from 6.8 x 10/sup -4/ to 18.5 x 10/sup -4/ in. In high velocity gas (150 ft/sec), weight gains varied from 0.7 to 2.0 mg/cm/sup 2/ after 100 hr. No scaling occurred during any experiment not involving thermal cycling. The relative thickness of the outer Fe/sup 2/O/sup 3/ layer in the scales examined was much greater under flowing gas than under semi- static conditions. It appears that the limiting temperature in reactors is 490 deg C; above this temperature excessive scale formation occurs. (auth)

• Research Organization: Australia. Atomic Energy Commission Research Establishment, Lucas Heights, New South Wales
• NSA Number: NSA-17-001869
• OSTI ID: 4770235
• Report Number(s): AAEC/E-97
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ADHESION
CARBON DIOXIDE
CHROMIUM OXIDES
CHROMIUM STEELS
CORROSION
FILMS
GAS FLOW
GASES
IRON OXIDES
LAYERS
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
OXIDATION
PRESSURE
QUANTITY RATIO
REACTORS
SURFACES
TEMPERATURE
THERMAL STRESSES
THICKNESS
VARIATIONS
VELOCITY
WATER
WEIGHT