Design properties of steels for coal conversion vessels. Mechanical properties of materials
The purpose of this report is to present a complete data log on the mechanical properties of the materials used in the present investigation. Weldments of SA387, SA542, and a type 347 stainless steel overlay were made by Chicago Bridge and Iron using base plates of typical commercial thickness and commercial welding practices. The results of preliminary mechanical property tests and microstructural examinations indicated that the material properties were sufficiently uniform and representative of conditions typical for production material properties to proceed with detailed testing. In SA387 and SA542, the microstructures were dominantly bainitic, with the average yield strengths respectively 345 MPa (50 ksi) and 496 MPa (72 ksi), due mostly to the selected tempering temperature. Average upper shelf Charpy toughness was 180 Joules (133 ft-lbs) in both SA387 and SA542 base metals but 50% FATT transition temperatures were 294/sup 0/K (70/sup 0/F) and 244/sup 0/K (-20/sup 0/F), respectively. A temper embrittling treatment was tried which raised the 50% FATT of SA387 base metal and weld metal 67/sup 0/K (120/sup 0/F). Upper shelf fracture energy of the SA387 base metal was reduced 50 percent by the T.E. treatment. Baseline data for the fracture mechanics type tests were developed in the form of da/dN versus ..delta..K/sub I/, and fracture toughness in terms of J/sub Ic/. Fatigue crack growth rate of SA387 was increased by a factor of 2 when comparing room temperature versus 727/sup 0/K (850/sup 0/F). Growth rate of SA542 was the same at 588/sup 0/K (600/sup 0/F) and room temperature. Fracture toughness by J/sub Ic/ showed the expected loss in upper shelf toughness with increased test temperature for SA387 base metal.
- Research Organization:
- Westinghouse Electric Corp., Pittsburgh, PA (United States). Research and Development Center
- OSTI ID:
- 5433204
- Report Number(s):
- EPRI-AP-1338
- Country of Publication:
- United States
- Language:
- English
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01 COAL, LIGNITE, AND PEAT
CHROMIUM-MOLYBDENUM STEELS
HEAT TREATMENTS
COAL GASIFICATION PLANTS
PRESSURE VESSELS
COAL LIQUEFACTION PLANTS
MATERIALS
STAINLESS STEEL-347
MECHANICAL PROPERTIES
WELDED JOINTS
STEEL-ASTM-A387
STEEL-ASTM-A542
CHARPY TEST
CLADDING
COAL GASIFICATION
COAL LIQUEFACTION
CRACKS
EMBRITTLEMENT
EXPERIMENTAL DATA
FATIGUE
FRACTURE PROPERTIES
GRAPHS
GROWTH
HYDROGEN
HYDROGEN SULFIDES
METALLOGRAPHY
METALLURGICAL EFFECTS
TABLES
TRANSITION TEMPERATURE
ALLOYS
CHALCOGENIDES
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CONTAINERS
CORROSION RESISTANT ALLOYS
CRYOGENIC FLUIDS
DATA
DATA FORMS
DEPOSITION
DESTRUCTIVE TESTING
ELEMENTS
FLUIDS
GASIFICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROGEN COMPOUNDS
IMPACT TESTS
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
LIQUEFACTION
MATERIALS TESTING
MECHANICAL TESTS
NICKEL ALLOYS
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
NONMETALS
NUMERICAL DATA
PHYSICAL PROPERTIES
STAINLESS STEELS
STEELS
SULFIDES
SULFUR COMPOUNDS
SURFACE COATING
TESTING
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
360100* - Metals & Alloys
010404 - Coal
Lignite
& Peat- Gasification
010405 - Coal
Lignite
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