Influence of H2S Corrosion on Rotating Bending Fatigue Properties of S135 Drill Pipe Steel |
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| Authors: | Bensheng Huang Jiang Yang Hui Zhang Ge Liu Yongbin Chen Jiachen Li |
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| Affiliation: | 1.School of Materials Science and Engineering,Southwest Petroleum University,Chengdu,People’s Republic of China;2.School of Mechanical and Electrical Engineering,Yangtze Normal University,Chongqing,People’s Republic of China;3.Southwest Company,China Petroleum Engineering Co., Ltd,Chengdu,People’s Republic of China |
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| Abstract: | Fatigue properties of S135 drill pipe steel 27CrMo under different conditions were investigated by rotating bending fatigue test. The results show that the fatigue limit at 106 cycles of the tested steel is 540 MPa. However, the fatigue cycles of the specimens after H2S corrosion shows a sharp decline from 106 to 104, when the stress is also 540 MPa. SEM observation of fatigue fracture surfaces reveal that the fatigue fracture has the characteristics of ductile fracture before H2S corrosion. After H2S corrosion, its shows the characteristics of brittle fracture. The main effect of H2S corrosion is that the hydrogen atoms gathered at grain boundaries, inclusions and defects, which promoted the process of fatigue crack initiation and propagation, reducing the fatigue properties. |
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