Effect of CO2/H2S and Applied Stress on Corrosion Behavior of 15Cr Tubing in Oil Field Environment

The corrosion behavior of a 15Cr-6Ni-2Mo martensitic stainless steel (15Cr stainless steel) in a CO2/H2S environment was investigated by conducting high-temperature/high-pressure immersion tests combined with scanning electron microscopy and metallographic microscopy. The presence of H2S decreased the corrosion resistance of the 15Cr tubing steel. The critical H2S partial pressure (PH2S) for stress corrosion cracking in the 15Cr tubing steel in the simulated oil field environment with a CO2 partial pressure of 4 MPa and an applied stress of 80% σs was identified. The 15Cr tubing steel mainly suffered uniform corrosion with no pitting and cracking when the PH2S was below 0.5 MPa. When the PH2S increased to 1 MPa and the test temperature was 150 °C, the pitting and cracking sensitivity increased. The stress corrosion cracking at a higher PH2S is attributed to the sulfide-induced brittle fracture.

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The Corrosion Behavior of Welded Line Pipes in Wet H2S Environment

4th International Pipeline Conference, Parts A and B ◽

10.1115/ipc2002-27418 ◽

2002 ◽

Author(s):

Yaorong Feng ◽

Chunyong Huo ◽

Feng Yan

Keyword(s):

Residual Stress ◽

Corrosion Resistance ◽

Stress Corrosion ◽

Applied Stress ◽

Corrosion Behavior ◽

Stress Corrosion Cracking ◽

Corrosion Cracking ◽

Steel Pipes ◽

H2s Corrosion ◽

Hydrogen Induced Cracking

The corrosion behavior of over-bending and under-bending formed Spiral Submerged Arc Welded (SSAW) steel pipes in NACE solution has been investigated by use of the self-designed full-scale corrosion test unit. It indicates that the H2S damage of welded pipes characteristics Blister and Stress Corrosion Cracking (SCC). The blister number, diameter, and crack number is increasing as the increasing of applied stress. The residual stress of welded pipes has a large effect on the H2S corrosion resistance, the tensile residual stress has a detrimental effect, and while the compression residual stress is beneficial to H2S corrosion resistance. The damage mechanism of the welded pipes in H2S containing solution under the presence of applied stress and residual stress has not only Hydrogen Induced Cracking (HIC), but also Stress Corrosion Cracking, and the applied stress and residual stress promote not only Stress Corrosion Cracking, but also Hydrogen Induced Cracking. The test results reveal that improving pipe’s weld surface quality, lowering tensile residual stress, and also control the operating stress are the key measures for controlling the wet H2S corrosion of welded steel pipes. Suggestions for selection of line pipes in different service conditions have been made.

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Effect of Applied Stress on Chloride Induced External Stress Corrosion Cracking of Type 304 Stainless Steel in Air Atmosphere

Journal of the Japan Institute of Metals and Materials ◽

10.2320/jinstmet.70.1012 ◽

2006 ◽

Vol 70 (12) ◽

pp. 1012-1015 ◽

Cited By ~ 4

Author(s):

Hitoshi Hayashibara ◽

Masami Mayuzumi ◽

Yoshihiro Mizutani ◽

Jun-ichi Tani

Keyword(s):

Stainless Steel ◽

Stress Corrosion ◽

Applied Stress ◽

Stress Corrosion Cracking ◽

Corrosion Cracking ◽

External Stress ◽

304 Stainless Steel ◽

Air Atmosphere ◽

Type 304 ◽

Type 304 Stainless Steel

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The Effect of Cold Work on the Stress-Corrosion Cracking of Type 302 Austenitic Stainless Steel

CORROSION ◽

10.5006/0010-9312-21.10.327 ◽

1965 ◽

Vol 21 (10) ◽

pp. 327-331 ◽

Cited By ~ 9

Author(s):

P. J. GREELEY ◽

V. J. RUSSO ◽

R. K. SAXER ◽

J. R. MYERS

Keyword(s):

Stainless Steel ◽

Austenitic Stainless Steel ◽

Stress Corrosion ◽

Applied Stress ◽

Stress Corrosion Cracking ◽

Cold Work ◽

Corrosion Cracking ◽

Time To Failure ◽

Annealed Material ◽

Cold Worked

Abstract The effect of cold work on stress-corrosion cracking of Type 302 austenitic stainless steel wire exposed to boiling (154 C, 309 F) 42 weight-percent aqueous magnesium chloride solution was determined. Wire specimens of 0.02-in diameter were stressed in uniaxial tension using specially designed glass test cells containing the corrosive environment. Tests were conducted at five applied stresses over the range 10,000 to 30,000 psi with laboratory-annealed wire and as-received (bright-annealed) material which had been cold worked 10, 20 and 30 percent. It was established that: (1) failure generally occurred in the vapor phase above the boiling MgCl2 solution, (2) the time-to-failure varied inversely with the applied stress, (3) the 10 percent cold-worked material exhibited the shortest time-to-failure, and (4) the 30 percent cold-worked material had the maximum resistance to stress-corrosion cracking. The short times-to-failure recorded for the 10 percent cold-worked material were attributed to introduction of large amounts of localized residual stresses in the bright-annealed material by the cold-working process. The longer times-to-failure associated with the more heavily cold-worked material were explained by the transformation of austenite to “quasi-martensite”. Crack propagation rates, nearly independent of the applied stress, were greatest for 10 percent cold-worked material. Average crack depth decreased with increasing degrees of applied stress and cold work. In general, a positive correlation existed between the crack density (cracks/inch) and the applied stress.

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