陶杉,徐燕东,杜春朝.超级 13Cr 管材在低 H2S 高 CO2 环境中的开裂敏感性研究[J].表面技术,2016,45(7):90-95.
TAO Shan,XU Yan-dong,DU Chun-chao.Cracking Sensibility of Super 13Cr Pipeline Steel in Environment with Low H2S and High CO2 Pressure[J].Surface Technology,2016,45(7):90-95 |
| 超级 13Cr 管材在低 H2S 高 CO2 环境中的开裂敏感性研究 |
| Cracking Sensibility of Super 13Cr Pipeline Steel in Environment with Low H2S and High CO2 Pressure |
| 投稿时间：2016-02-23 修订日期：2016-07-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.07.016 |
| 中文关键词: 超级 13Cr 低 H2S/高 CO2环境 应力腐蚀开裂 点蚀 温度 腐蚀速率 |
| 英文关键词:super 13Cr low H2S and high CO2 environment stress corrosion cracking pitting corrosion temperature corrosion rate |
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| 中文摘要: |
| 目的 针对 IS15156 标准中对超级 13Cr-110 马氏体不锈钢使用条件的限制，及不同研究者对其开裂条件的不同观点，研究超级 13Cr-110 马氏体不锈钢在不同温度、不同低 H2S 分压条件下的开裂敏感性。方法 通过模拟我国西部酸性油田低 H2S 高 CO2环境，利用高温高压设备，进行了三点弯曲试验，并结合失重法测试腐蚀速率。 结果 在硫化氢分压为 6 kPa 时，超级 13Cr-110 马氏体不锈钢腐蚀速率随温度降低而减小， 80 ℃ 时仅 0.0031 mm/a，但应力腐蚀开裂敏感性增加。在 210 ℃条件下，当硫化氢分压从 6 kPa 升至 165 kPa 时，腐蚀速率变化不明显。同时，超级 13Cr-110 马氏体不锈钢的开裂敏感性降低，但长周期实验依然会发现裂纹。 结论 通过对裂纹及断口形貌分析发现，超级 13Cr-110 马氏体不锈钢在低 H2S 分压条件下的开裂类型为氢脆型硫化物应力腐蚀开裂，即局部钝化膜遭受破坏，进而发生点蚀，导致氢在应力集中区域聚集，最后发生氢脆。硫化氢分压从 6 kPa 增加到 165 kPa，局部腐蚀受到抑制，由点蚀导致开裂的敏感性降低。超级 13Cr-110 马氏体不锈钢不一定能在标准中推荐的硫化氢分压不大于 10 kPa 的条件下使用。 |
| 英文摘要: |
| Objective Aimed at the service restrictions of super 13Cr-110 martensite stainless steel in standard IS15156 and the various viewpoints of its cracking condition, cracking sensibility of super 13Cr-110 martensite stainless steel at different temperatures and diverse low H2S partial pressures was studied. Methods The experiments of weight loss and three point bending test were carried out in the simulated corrosion environment based on acid oilfield containing low H2S and high CO2 in West China. High temperature and pressure autoclave was used during the test. Results The corrosion rate of super 13Cr-110 martensite stainless steel diminished with the decrease of temperature. It was 0.0031 mm/a at 80 ℃. Nevertheless, the stress corrosion cracking sensibility increased. The corrosion rate changed a little when H2S partial pressure rose from 6 kPa to 165 kPa at 210 ℃. Meanwhile, the cracking sensibility of super 13Cr-110 martensite stainless steel decreased. But fissures also appeared in long-term test. Conclusion Under low H2S partial pressure, the cracking type of super 13Cr-110 martensite stainless steel showed hydrogen embrittlement sulfide-stress cracking according to the analysis on the pattern of fissure and fracture. Firstly, local passive film was damaged and then pitting corrosion occured which led to the assembling of H. Finally, hydrogen embrittlement happened. With the H2S partial pressure lifting from 6 kPa to 165 kPa, the cracking sensibility of 13Cr-110 caused by pitting corrosion reduced due to the restraining of pitting corrosion. Super 13Cr-110 martensite stainless steel might not be applicable in the environment containing no more than 10 kPa H2S as recommended in the standard. |
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