HIGH TEMPERATURE COMPATIBILITY OF 25/20 TYPE AUSTENITIC STAINLESS STEEL WITH CARBON DIOXIDE

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

OSTI ID:4735323

Lee, E; Draycott, A

The 25% Cr, 20% Ni type stainless steel has been proposed for use in the Australian High Temperature Gas Cooled Reactor in core structures, and in hot gas ducting. Thus a knowledge of the compatibility of this steel with high pressure CO/sub 2/ was required. Rates and mechanisms of corrosion were investigated for machined, vapor blasted, and etched pretreated samples of this steel, exposed to CO/sub 2/ up to 5,000 hr in the temperature rarge 650 deg C to 800 deg C at gas pressures from 3 psig to 280 psig. Oxide film flaking was apparent at all temperatures investigated, but was severe only for pre-ground samples at 710 deg C and above, and for pre-vapor blasted samples at 760 deg C and above. However, severe intergranular penetration was observed in preetched samples on exposure to CO/sub 2/ at 650 deg C and above. Pressure of the gas appeared to have no systematic effect on the corrosion rate, at least in the temperature range investigated. The maximum useful temperature for which the steel could be used would be limited by the amount of oxide flaking permissible. In reactor gas circuits where a small amount of scale flaking could be tolerated, the steel is satisfactory up to 750 deg C. (auth)

• Research Organization: Australia. Atomic Energy Commission Research Establishment, Lucas Heights, New South Wales
• NSA Number: NSA-17-006560
• OSTI ID: 4735323
• Report Number(s): AAEC/E-98
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CARBON DIOXIDE
CORROSION
FILMS
GAS COOLANT
GRAIN BOUNDARIES
HEAVY WATER
HIGH TEMPERATURE
MECHANICS
METALS, CERAMICS, AND OTHER MATERIALS
OXIDES
PARTICLES
PLANNING
PRESSURE
PRODUCTION
REACTION KINETICS
REACTORS
STAINLESS STEELS
TEMPERATURE