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Hydrogen Sulfide Resistant Stress Corrosion Cracking of Low C-Mn Steels for Oil Well Casing |
HE Fei1,SHANG Cheng-jia1,ZHANG Feng2,BI Zong-yue2 |
1. School of Materials Science and Engineering, University of Science and Techology Beijing, Beijing 100083, China 2. Baoji Petroleum Steel Pipe Co., Ltd., Baoji 721008, Shaanxi, China |
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Abstract Alloy design, heat treatment process and microstructure and properties relationship of 621MPa(90ksi) grade oil well casing steels of H2S resistant corrosion were studied. Such two kinds as 0.08C-0.8Mn and 0.20C-08Mn of low C-Mn tested steels were designed, respectively. And the effect of dislocation, precipitation and carbide of tested steels after heat treatment on SSCC performance was investigated. The results show that the low C-Mn and Nb-V-Ti-B micro-alloy design has excellent mechanical properties, toughness and resistance to H2S stress corrosion cracking performance through proper quenching and tempering heat treatment process, to meet the requirements of the relevant standards. The results also show that the un-coplanar dislocation group, fine precipitates and dispersive high sphericity carbide would be beneficial to excellent hydrogen sulfide stress corrosion cracking resistance.
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Received: 09 November 2012
Published: 21 March 2013
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