EFFECT OF ENVIRONMENT ON THE CREEP PROPERTIES OF TYPE 304 STAINLESS STEEL AT ELEVATED TEMPERATURES

Technical Report · Tue Sep 18 04:00:00 EDT 1962

DOI:https://doi.org/10.2172/4782789· OSTI ID:4782789

McCoy, Jr., H. E.; Douglas, Jr., D. A.

ABS>The effects of Ar, H/sub 2/, CO, CO/sub 2/, N/sub 2/, air, and O/sub 2/ on the creep properties of type 304 stainless steel were studied. The results of completed tests indicate that air, CO, CO/sub 2/, and N/sub 2/ are strengthening to the alloy. Carburization and nitriding are believed to be primarily responsible for the strengthening in these environments. At 1500 deg F, O/sub 2/ at 1 atm pressure has a deleterious effect on the creep properties, but at 1700 deg F the creep properties are improved. Creep tersts at 1500 deg F in various argon--oxygen mixtures show that small oxygen concentrations cause pronounced strengthening with a maximum effect being observed at 10 ppm O2. At 1500 deg F the creep properties appear to be unaffected by hydrogen, but at 1700 deg F deleterious effects are observed. Tensile tests were used to evaluate the influence of carbon on the rupture ductility of this material. It was found that significant reduction in ductility occurred as the carbon content was increased. It was found that copper plating effectively reduced the rate of carburization at 1300 deg F. The service life of copper films at higher temperatures was seriously limited. Several general remarks are made relative to conceivable compatibility problems during reactor operation associated with the type 304 stainless steel cladding. It is felt that the most serious problem is associated with carburization and the subsequent distribution of carbon in the metal. (auth)

• Research Organization: Oak Ridge National Lab., Tenn.
• DOE Contract Number: W-7405-ENG-26
• NSA Number: NSA-16-030797
• OSTI ID: 4782789
• Report Number(s): ORNL-2972
• Country of Publication: United States
• Language: English

Related Subjects

AIR
ARGON
CARBIDES
CARBON
CARBON DIOXIDE
CARBON MONOXIDE
COPPER
CREEP
DISTRIBUTION
EFFICIENCY
FAILURES
FILMS
FUEL CANS
HIGH TEMPERATURE
HYDROGEN
INERT GASES
MATERIALS TESTING
METALS, CERAMICS, AND OTHER MATERIALS
MIXING
NITRIDES
NITROGEN
OXYGEN
PLATING
PRESSURE
REACTORS
STAINLESS STEELS
TENSILE PROPERTIES