林海,许杰,范白涛,张羽臣,王桂萍,霍宏博,殷启帅.L80 钢在 CO2/H2S 腐蚀环境中的力学特性[J].表面技术,2016,45(5):91-96.
LIN Hai,XU Jie,FAN Bai-tao,ZHANG Yu-chen,WANG Gui-ping,HUO Hong-bo,YIN Qi-shuai.Mechanical Properties of L80 Steel in CO2/H2S Environment[J].Surface Technology,2016,45(5):91-96
L80 钢在 CO2/H2S 腐蚀环境中的力学特性
Mechanical Properties of L80 Steel in CO2/H2S Environment
投稿时间:2016-01-22  修订日期:2016-05-20
DOI:10.16490/j.cnki.issn.1001-3660.2016.05.014
中文关键词:  L80 钢  CO2腐蚀  H2S 腐蚀  力学特性  腐蚀速率  应力腐蚀
英文关键词:L80 steel  CO2 corrosion  H2S corrosion  mechanical property  corrosion rate  stress corrosion
基金项目:总公司科技重大专项(YXKY-2013-TJ-01, YXKY-2015-TJ-04)
作者单位
林海 中海石油有限公司天津分公司,天津 300452 
许杰 中海石油有限公司天津分公司,天津 300452 
范白涛 中海石油有限公司天津分公司,天津 300452 
张羽臣 中海石油有限公司天津分公司,天津 300452 
王桂萍 中海石油有限公司天津分公司,天津 300452 
霍宏博 中海石油有限公司天津分公司,天津 300452 
殷启帅 中国石油大学 石油工程学院,北京 102249 
AuthorInstitution
LIN Hai CNOOC China Limited, Tianjin Branch, Tianjin 300452, China 
XU Jie CNOOC China Limited, Tianjin Branch, Tianjin 300452, China 
FAN Bai-tao CNOOC China Limited, Tianjin Branch, Tianjin 300452, China 
ZHANG Yu-chen CNOOC China Limited, Tianjin Branch, Tianjin 300452, China 
WANG Gui-ping CNOOC China Limited, Tianjin Branch, Tianjin 300452, China 
HUO Hong-bo CNOOC China Limited, Tianjin Branch, Tianjin 300452, China 
YIN Qi-shuai Department of Petroleum Engineering, China University of Petroleum, Beijing 102249, China 
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中文摘要:
      目的 研究 L80 钢在 CO2/H2S 环境中的力学特性。 方法 利用微机控制慢应变速率拉伸试验机,对特定腐蚀条件下的 L80钢试样进行拉伸实验,分析各因素对 L80钢力学特性的影响变化规律。结果 在CO2/H2S 环境中,随着含水率的增加, L80 钢的屈服强度、抗拉强度、延伸率均下降, L80 钢拉伸曲线出现劣化。 随预拉应力的增大, L80 钢的屈服强度变化不明显,而抗拉强度和延伸率降低,当预拉应力超过 0.8σs时, L80 钢的腐蚀速率显著增加,表现出较强的应力腐蚀敏感性;随着 H2S 分压的增加,L80 钢的力学性能发生劣化,表现出氢脆敏感性,而受 CO2分压的影响不明显;温度升高导致 L80 钢的拉伸曲线出现了轻度劣化,延伸率和屈服区宽度小幅降低,但抗拉强度变化不大。 结论 L80 钢在CO2/H2S 环境中的力学特性受温度、 CO2 分压影响程度小。含水率和预拉应力的增大降低了 L80 钢的力学韧性,预拉应力的存在使 L80 腐蚀速率加快,缩短了耐腐蚀寿命。 L80 钢的力学性能对于 H2S 分压较对 CO2分压更为敏感,试样的断裂是机械拉力和应力腐蚀共同作用的结果。
英文摘要:
      Objective To study the mechanical properties of L80 steel in CO2 / H2S environment. Methods Slow strain rate tensile testing machine was used to conduct tensile tests on L80 samples in specific corrosion conditions, and the influence rules of each factor on the mechanical properties of L80 steel were analyzed. Results In CO2/H2S environment, with the increase of water cut, the tensile curve of L80 tubing steel appeared to degrade, the yield strength, tensile strength, and elongation all decreased; With the increase of tensile stress, the yield strength of L80 steel had no significant change, the tensile strength and elongation decreased, and the corrosion rate significantly changed when the tensile stress exceeded 0.8σs, which showed strong stress corrosion sensitivity; With the increase of H2S partial pressure, the mechanical properties of L80 steel decreased, showing relatively strong hydrogen embrittlement sensitivity, but influence of CO2 partial pressure on L80 steel was not obvious; Tensile curve of L80 steel underwent mild degradation with the increase of temperature, the elongation and yield zone width reduced with a small amplitude, but the tensile strength just changed a little. Conclusion Temperature and CO2 had a small effect on the mechanical properties of L80 steel; The increase of water cut and tensile stress reduced the mechanical toughness of L80 steel, accelerated the corrosion rate of L80 steel, and shortened the anticorrosion longevity of L80 steel; Mechanical properties of L80 steel were more sensitive to H2S than CO2, and sample fracture was the result of the combination of machine tensile and stress corrosion.
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