Creep strength of N9 and N10 material (steel)

Technical Report · Wed Feb 17 04:00:00 EDT 1943

OSTI ID:7084612

This letter was a response to the receipt of tables of information from the materials-testing laboratory at Ludwigshafen. The tables dealt with various properties of N9 and N10 steels for production of high-pressure hydrogenation vessels. The letter expressed questions about some of the information, especially about the methods of tempering the test steels and about certain figures for contraction of N9. The letter gave Leuna's values for creep strength (long-time rupture strength) after 20,000 hours of operation as 11 to 15 kg/mm/sup 2/ for N9 versus 26 to 30 kg/mm/sup 2/ for N10, and said that similar relationships existed in values for continuous creep strength (fatigue strength for an infinite time) between the steels. It had generally been Leuna's experience in high-temperature ruptures of pipes, though, that long before brittleness and contraction had set in very much, the physical action of hydrogen on the steel had led to ruptures. Because of this hydrogen activity, it was the aim of current work to increase the stability of N10 against hydrogen. One reason for the effort was to avoid being forced to rely on austenitic steels alone for the future development of the best steels for pressure vessels, since the resulting large demands on chromium and manganese might not always be able to be supplied. It was known that stability against hydrogen could be increased by addition of titanium to the steel, but it was not known to what extent creep strength in a hydrogen atmosphere could be improved thereby. Addition of titanium could also allow a corresponding reduction in the usage of vanadium or tungsten. Further discussions with steel suppliers were recommended.

• Research Organization: I.G. Farbenindustrie, A.G., Merseburg (Germany)
• OSTI ID: 7084612
• Report Number(s): TOM-251-467-469
• Country of Publication: United States
• Language: German

Related Subjects

01 COAL, LIGNITE, AND PEAT
010403 -- Coal & Coal Products-- Hydrogenation-- (-1987)
36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
BRITTLENESS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CHROMIUM
COAL
COAL LIQUEFACTION PLANTS
CONTAINERS
CORROSION FATIGUE
CRYOGENIC FLUIDS
ELEMENTS
ENERGY SOURCES
FAILURES
FATIGUE
FLUIDS
FOSSIL FUELS
FUELS
GERMANY
HEAT TREATMENTS
HIGH PRESSURE
HIGH TEMPERATURE
HYDROGEN
HYDROGENATION
INDUSTRIAL PLANTS
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE
MECHANICAL PROPERTIES
METALS
NONMETALS
PIPES
PLASTICITY
PRESSURE VESSELS
REFRACTORY METALS
RUPTURES
STEELS
TEMPERING
TITANIUM
TRANSITION ELEMENTS
TUNGSTEN
VANADIUM