EFFECT OF CO$sub 2$ ON THE STRENGTH AND DUCTILITY OF TYPE 304 STAINLESS STEEL AT ELEVATED TEMPERATURES

Technical Report · Thu Sep 27 04:00:00 EDT 1962

DOI:https://doi.org/10.2172/4761440· OSTI ID:4761440

Martin, W R; McCoy, Jr, H E

The mechanisms by which the carbon dioxide coolant affects the strength properties of type 304 stainless steel were investigated in the range 1300 to 1700 deg F (704-927 deg C). Creep- and stress-rupture results obtained on sheet materials in wet and dry CO/sub 2/ and argon are compared. The effect of annealing in CO/sub 2/ on the tensile strength and ductility was also investigated. The question of whether the strengthening observed in CO/sub 2/ was due to oxidation or carburization was determined. Experiments on the effect of various partial pressures of oxygen in argon showed that the creep rate was minimum at approximately 10 ppm. The creep rate is CO/sub 2/ at equivalent stress and temperature was lower by a factor of 3 than the minimum rate observed in oxygen. Chemical analyses, metallography, and experiments with carbon showed that carburization occurred in pure flowing CO/sub 2/ in the temperature range studied. From this evidence it was concluded that the strengthening observed in CO/sub 2/ was primarily due to carburization. The creep- and tensile-fracture strains were adversely affected by exposure to CO/sub 2/, with the magnitude of the effect dependent on the time and temperature of exposure. (auth)

• Research Organization: Oak Ridge National Lab., Tenn.
• DOE Contract Number: W-7405-ENG-26
• NSA Number: NSA-16-032081
• OSTI ID: 4761440
• Report Number(s): ORNL-TM-339
• Country of Publication: United States
• Language: English

Related Subjects

ANNEALING
ARGON
CARBON
CARBON DIOXIDE
CARBURIZATION
CREEP
DUCTILITY
EFFICIENCY
FAILURES
HIGH TEMPERATURE
HUMIDITY
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
OXIDATION
OXYGEN
PLATES
PRESSURE
QUALITATIVE ANALYSIS
REACTION KINETICS
STAINLESS STEELS
STRESSES
TENSILE PROPERTIES