Effects of sour crude oil on fatigue properties of steel plates for shipbuilding

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:70133

Ouchi, H; Kobayashi, J ^[1]; Ishikawa, T; Takezawa, H ^[2]; Ebara, R; Yamada, Y ^[3]

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1. Nippon Steel Corp., Chiba (Japan). Steel Research Labs.
2. Nippon Steel Corp., Oita (Japan). Oita Research and Development Division
3. Mitsubishi Heavy Industries, Ltd., Hiroshima (Japan). Hiroshima Research and Development Center

The concentration of diffusible hydrogen introduced into steel was measured, and fatigue crack growth tests and fatigue life tests were carried out in sour crude oil containing a high concentration of hydrogen sulfide and under electrolytic hydrogen-charging conditions in neutral solution, using a high strength steel produced by the thermo-mechanical control process (TMCP) and a mild steel which are steels for hull plates. Comparison of the results demonstrated that a very small amount of hydrogen such as that introduced into steel from sour crude oil under atmospheric pressure accelerated the fatigue crack growth in the high {Delta}K regime and shortened the fatigue life in the high stress range region, but did not shorten the fatigue life in the low stress region. The electrolytic hydrogen-charging condition appeared to be appropriate as a fatigue-crack-growth test environment to simulate sour crude oil. The deterioration of fatigue characteristics of the TMCP high strength steel was similar with that of the mild steel.

• OSTI ID: 70133
• Report Number(s): CONF-940222--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
CORROSION FATIGUE
CORROSIVE EFFECTS
CRACK PROPAGATION
EXPERIMENTAL DATA
HYDROGEN EMBRITTLEMENT
HYDROGEN SULFIDES
LOW ALLOY STEELS
MECHANICAL PROPERTIES
MECHANICAL TESTS
PETROLEUM
SERVICE LIFE
TANKER SHIPS