Fatigue crack growth in an X65 line-pipe steel in sour crude oil

Journal Article · Wed Dec 01 04:00:00 EST 1976 · Corrosion; (United States)

DOI:https://doi.org/10.5006/0010-9312-32.12.472· OSTI ID:6068643

Vosikovsky, O

The fatigue crack growth rates in an X65 line pipe steel in crude oil environment with two different contents of H/sub 2/S, approx. 1 ppM and saturation (approx. 4700 ppM) were measured at three low cyclic frequencies. The maximum acceleration of growth rate relative to that in air was 3 times at the low H/sub 2/S content and 20 times at saturation level. The results are compared with fatigue growth rates in a 3.5% NaCl aqueous solution at cathodic and free corrosion potentials. Fractographic examination revealed identical brittle striations in both environments when a substantial growth acceleration occurred, indicating hydrogen embrittlement. A complex effect of the stress intensity range, frequency, and hydrogen charging ability of the environment on the fatigue crack growth rate is shown.

• Research Organization: Department of Energy, Mines and Resources, Ottawa, Ontario
• OSTI ID: 6068643
• Journal Information: Corrosion; (United States), Journal Name: Corrosion; (United States) Vol. 32:12; ISSN CORRA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
022000 -- Petroleum-- Transport
Handling
& Storage
36 MATERIALS SCIENCE
360100* -- Metals & Alloys
ALLOYS
CHALCOGENIDES
CRACK PROPAGATION
ENERGY SOURCES
FATIGUE
FOSSIL FUELS
FUELS
HYDRAULIC TRANSPORT
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
PETROLEUM
PIPELINES
STEELS
SULFIDES
SULFUR COMPOUNDS
TRANSPORT