Stress corrosion cracking and hydrogen embrittlement of high-strength nonmagnetic alloys in brines
Unexpected brittle failures of UNS N05500 drill string parts and nonmagnetic drill collars have recently been observed in cases where the UNS N05500 components were galvanically coupled to carbon steel in concentrated salt solutions at temperatures between ambient and higher than 373 K (100 C). Cracking occurred preferably at locations with a tri-axial stress condition (roots of threads) and has been ascribed to hydrogen embrittlement. Mechanical and slow strain rate tests with UNS N05500, higher at the free corrosion potential or galvanically coupled to carbon steel, have been carried out in MgCl/sub 2/ mud to determine the conditions under which hydrogen embrittlement occurs. A number of alternative high-strength nonmagnetic alloys were included in the tests. It was found that under all test conditions, UNS N05500 was embrittled by hydrogen when galvanically coupled to carbon steel. It was immune to cracking at its free corrosion potential. Under the conditions of our tests, alloys SCF 19, N 10276, and R 30035 were not susceptible to either stress corrosion cracking (SCC) or hydrogen embrittlement.
- Research Organization:
- Koninklijke/Shell Laboratorium, Amsterdam (Shell Research B.V.), P.O. Box 1003, Amsterdam
- OSTI ID:
- 6961720
- Journal Information:
- Mater. Performance; (United States), Vol. 25:10
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
42 ENGINEERING
36 MATERIALS SCIENCE
BRINES
CORROSIVE EFFECTS
CARBON STEELS
CRACK PROPAGATION
HYDROGEN EMBRITTLEMENT
STRESS CORROSION
DRILL BITS
DRILL PIPES
WELL DRILLING
AMBIENT TEMPERATURE
DRILLING FLUIDS
MAGNESIUM CHLORIDES
MECHANICAL TESTS
MEDIUM TEMPERATURE
NATURAL GAS WELLS
OIL WELLS
STRAIN RATE
THREADED JOINTS
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CORROSION
DRILLING
DRILLING EQUIPMENT
EMBRITTLEMENT
EQUIPMENT
FLUIDS
HALIDES
HALOGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MAGNESIUM COMPOUNDS
MATERIALS TESTING
PIPES
STEELS
TESTING
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing
420206 - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)
360105 - Metals & Alloys- Corrosion & Erosion
360103 - Metals & Alloys- Mechanical Properties