Optimization of metallurgical variables to improve corrosion resistance of Inconel alloy 600. Final report. [PWR]
Several aspects of the corrosion performance of thermally treated and mill-annealed Inconel alloy 600 steam generator tubing were evaluated. Thermally treated tubing had caustic stress corrosion cracking (SCC) resistance superior to that of the mill-annealed product over a range of sodium hydroxide concentrations (10 to 50 weight percent), test temperatures (316/sup 0/C to 343/sup 0/C (600/sup 0/F to 650/sup 0/F)), and stress levels. There was a comparable differentiation when specimens were held in the active-passive potential range and in slow strain rate tests in caustic. Corrosion degradation was minimal in both material conditions in high-temperature (332/sup 0/C (630/sup 0/F)) aqueous chloride solutions. SCC was also absent in both material conditions in high-temperature (332/sup 0/C (630/sup 0/F)) aqueous neutral and basic sulfate solutions. However, thermally treated tubing had superior SCC resistance in acid sulfate environments. SCC was present in highly stressed mill-annealed Inconel alloy 600 U-bends exposed to high temperature (360/sup 0/C (680/sup 0/F)) pure water. The SCC initiation time was shorter when the autoclave operated with a hydrogen overpressure.
- Research Organization:
- Westinghouse Electric Corp., Pittsburgh, PA (USA)
- OSTI ID:
- 5350210
- Report Number(s):
- EPRI-NP-3051; ON: DE84920007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
INCONEL 600
STRESS CORROSION
PWR TYPE REACTORS
REACTOR MATERIALS
STEAM GENERATORS
CRACKS
MICROSTRUCTURE
PERFORMANCE TESTING
THERMAL STRESSES
TUBES
WATER CHEMISTRY
ALLOYS
BOILERS
CHEMICAL REACTIONS
CHEMISTRY
CHROMIUM ALLOYS
CORROSION
CRYSTAL STRUCTURE
INCONEL ALLOYS
IRON ALLOYS
MATERIALS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
REACTORS
STRESSES
TESTING
VAPOR GENERATORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
210200* - Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
360105 - Metals & Alloys- Corrosion & Erosion