Heat-to-heat variation in creep properties of Types 304 and 316 stainless steels
A wide variation in creep-rupture and long-term creep properties of 20 heats of type 304 and seven heats of type 316 stainless steel was observed. The observed variation in 1000-h creep-rupture strength, S/sup t//sub R/, has been related to the corresponding ultimate tensile strength variation, S/sup r//sub u/, by a relationship of the form: S/sup t//sub R/ = ..cap alpha.. exp (..beta..S/sup r//sub u/), where ..cap alpha.. and ..beta.. are material constants. This relationship between creep-rupture strength and ultimate tensile strength was further extended for minimum-expected 10/sup 5/-h creep-rupture strength data reported in the literature. The heat-to-heat variation in ultimate tensile strength for both 304 and 316 stainless steel was explained in terms of carbon plus nitrogen content and grain intercept, d, by a relationship of the form S/sup r//sub u/ = A(C + N)/sup -1///sub 2/ + B, where A and B are constants for a given temperature. The time to onset of third-stage creep for various heats of type 304 and 316 stainless steel was related to time to rupture by relationships that are independent of test temperature, for test times reaching 22,622 h.
- Research Organization:
- Oak Ridge National Lab., TN
- OSTI ID:
- 7290394
- Journal Information:
- J. Pressure Vessel Technol.; (United States), Journal Name: J. Pressure Vessel Technol.; (United States); ISSN JPVTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
BREEDER REACTORS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CREEP
EPITHERMAL REACTORS
FAILURES
FAST REACTORS
FBR TYPE REACTORS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
REACTOR MATERIALS
REACTORS
RUPTURES
STAINLESS STEEL-304
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
TENSILE PROPERTIES
TIME DEPENDENCE