EFFECT OF HIGH TEMPERATURE SODIUM ON AUSTENITIC AND FERRITIC STEELS. PHYSICAL PROPERTIES OF MATERIALS. Topical Report No. 2. RESULTS OF PHYSICAL PROPERTYTESTS OF 316 SS SPECIMENS IN 1200 F SODIUM WITH LOW OXYGEN
A program is in progress in which the physical properties of 316 stainless steel and 21/4 Cr-- 1 Mo steel are compared in dynamic sodium systems at 1200 deg F and 1100 deg F respectively. This report presents the results of the first test series in which the fatigue, tensile, creep and creep-torupture properties of Type 316 ss were compared in 1200 deg F sodium, air, and helium environments. The results of these tests revealed: (1) The stainless steel specimens to be used throughout the program were representative of an average Type 316 ss heat. (2) The high temperature (1200 deg F) fatigue life of 316 ss in helium is longer than in air. The fatigue life of 316 ss in 1200 deg F sodium is the same as in air at high cyclic strains but is the same as in 1200 deg F helium at the low cyclic strains. Short time exposure to 1200 deg F sodium prior to high cyclic strain tests did not appreciably effect the life in sodium and helium but shortened the life in air. (3) No significant differences in the creep-rupture properties of 316 ss were discernible in air, sodium, or helium at 1200 deg F. Specimens exposed for 4000 hours (unstressed) in 1200 deg F sodium also showed no significant change in creep-rupture properties. (4) The creep rates of 316 ss appear to be consistentiy higher in 1200 deg F helium and sodium compared to 1200 deg F air; however, the results show the stresses to produce a minimum creep rate of 1% in 10,000 hours in all three environments to be within a 15% spread. (5) Tensile properties showed no significant differences when tested in air or helium regardless of whether the specimens were exposed for 4000 hours to sodium or whether the exposed specimens were washed or unwashed prior to testing. (auth)
- Research Organization:
- MSA Research Corp., Callery, Penna. (US)
- Sponsoring Organization:
- US Atomic Energy Commission (AEC)
- NSA Number:
- NSA-18-018314
- OSTI ID:
- 4038741
- Report Number(s):
- MSAR-64-18
- Country of Publication:
- United States
- Language:
- English
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