Abstract
Creep tests and constant load rate tensile tests at cryogenic temperatures were made on austenitic stainless steels, SUS 304L, 310S and 316L. Creep rate of about 10-9s-1 was observed in 200 hour creep test under the proof stress of the materials at 77K, and creep rate at 4K was decreased to a tenth at 77K.On the other hand, an abrupt and large deformation occurs in a constant load rate tensile test at 4K. The magnitude of the abrupt deformation depends on the workhardening rate and the stability of austenitic phase. Higher proof stress materials, especially SUS 310S, do not always show better characteristics for the creep or the abrupt deformation at 4K.
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