Use of ultimate tensile strength to estimate the creep--rupture behavior of austenitic weld metals and castings

Technical Report · Mon Apr 30 20:00:00 EDT 1979

DOI:https://doi.org/10.2172/6046556· OSTI ID:6046556

Sikka, V. K. ^[1]; McEnerney, J. W. ^[1]

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1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Nuclear and fossil power plants, coal conversion systems, and chemical plants constructed of types 304 and 316 stainless steel generally contain welds deposited with type 308, 317, or 16-8-2 filler metal. Autogenous welds (without filler metal) may be used. Prospects for estimating weld creep data with significant success by use of knowledge of weld metal elevated-temperature tensile properties are described. Previously developed base metal rupture time and minimum creep rate empirical models containing an elevated-temperature ultimate tensile strength are extended to the weld metal data. The base--metal models for type 304 stainless steel to type 308 weld metal and models for type 316 to type 316 or 16-8-2 weld metal are applied. Data were analyzed for both as-welded and heat-treated weld metals and weldments, centrifugally cast pipes, and the riser portions of static castings of types 316L and 316 stainless steel. The weldments investigated were made by the submerged-arc, shielded metal-arc, and gas tungsten-arc processes. The data on castings were analyzed both as cast and after sigma heat-treatment. Creep-rupture tests extending over rupture times ranging to 10,000 h and temperatures from 482 to 649°C were considered. Elevated-temperature ultimate tensile strength can be used as a possible index for estimating the creep--rupture time and minimum creep rate properties of austenitic welds and castings. Rupture times were predicted more accurately than the minimum creep rates. Use of elevated-temperature ultimate tensile strength is suggested to check if the fabrication procedures during welding are followed and if the weldment meets the specified creep properties.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725; W-7405-ENG-26
• OSTI ID: 6046556
• Report Number(s): ORNL/TM--6781
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
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ALLOYS
ARC WELDING
CASTINGS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COAL GASIFICATION
CORROSION RESISTANT ALLOYS
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FABRICATION
FAILURES
FOSSIL-FUEL POWER PLANTS
GAS TUNGSTEN-ARC WELDING
GASIFICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
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JOINTS
MATERIALS
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
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NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
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STAINLESS STEEL-16-8-2
STAINLESS STEEL-304
STAINLESS STEEL-308
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
SUBMERGED ARC WELDING
TENSILE PROPERTIES
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
WELDED JOINTS
WELDING