[1]刘仁柱,帅 健,孔令圳,等.管线钢高pH值应力腐蚀裂纹研究[J].焊管,2013,36(6):21-25.[doi:1001-3938(2013)06-0021-05]
 LIU Renzhu,SHUAI Jian,KONG Lingzhen,et al.Study on High pH Stress Corrosion Cracking(SCC) of Pipeline Steel[J].,2013,36(6):21-25.[doi:1001-3938(2013)06-0021-05]
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管线钢高pH值应力腐蚀裂纹研究
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《焊管》[ISSN:1001-3938/CN:61-1160/TE]

卷:
36
期数:
2013年第6期
页码:
21-25
栏目:
试验与研究
出版日期:
2013-06-28

文章信息/Info

Title:
Study on High pH Stress Corrosion Cracking(SCC) of Pipeline Steel
文章编号:
1001-3938(2013)06-0021-05
作者:
刘仁柱1帅 健2孔令圳2彭海涛3周夏伊2
(1.中海油气电集团管网信息监控中心,北京 100012;
  2.中国石油大学(北京),北京 102249;
  3.中国石油西南油气田公司,成都 610051)
Author(s):
LIU Renzhu1 SHUAI Jian2 KONG Lingzhen2 PENG Haitao3 ZHOU Xiayi2
(1. CNOOC Gas & Power Group official website monitoring center, Beijing 100012, China;
2. China University of Petroleum (Beijing), Beijing 102249, China;
3. PetroChina Southwest Oil & Gasfield Company, Chengdu 610051, China)
关键词:
管线钢高pH值应力腐蚀电化学测试裂纹
Keywords:
pipeline steel high pH SCCelectrochemical test crack
分类号:
TE988
DOI:
1001-3938(2013)06-0021-05
文献标志码:
A
摘要:
许多油气管道断裂事故与管道外表面的应力腐蚀开裂(SCC)有关。对高pH值溶液中的16Mn钢和X70管线钢分别进行了电化学测试和拉伸试验,利用动电位极化曲线测试得到了快慢扫描极化曲线(慢扫描速度20 mV/min,快扫描速度1 000 mV/min),根据它们的差值确定了16Mn钢和X70管线钢对高pH值应力腐蚀开裂敏感的电位。结果表明,环境温度对敏感电位的影响较大,随温度的升高,扩大了敏感电位区间。在高pH值应力腐蚀敏感电位(-600 mV SCE)下,恒定加载试样应力到管材屈服极限的70%,试样表面未出现表面开裂;而在间断加载条件下,在颈缩区表面出现了裂纹,说明载荷的波动是高pH值应力腐蚀裂纹萌生的必要条件,且高pH值应力腐蚀开裂易发生在塑性变形和应力集中处。
Abstract:
Many breakage accidents of oil & gas pipeline are linked with SCC of pipeline outside surface . In this article, electrochemical testing and tensile test were conducted on 16Mn and X70 pipeline steels respectively. The slow and rapid sweep rate curves(slow sweep rate 20 mV/min, rapid sweep rate 1 000 mV/min) were obtained by potentiodynamic polarization curve tests, and the potential range sensitive to high pH SCC was determined by difference value of the slow and rapid sweep curves. The result showed that environment temperature greatly affect the potentials sensitive to high pH SCC. The higher the temperature is, the wider the sensitive potential range is. Under the potential sensitive to SCC(-600 mV SCE), specimens are loaded constantly to 70% of yield limit of material, no cracking occurs on the specimen surface. Under intermittent loading, cracks appear on the surface in the necking area. The experiment results indicated that the fluctuation of the load is necessary to the initiation of high pH SCC, and the high pH SCC occurs easily in the position where plastic deformation or stress concentration.

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备注/Memo

备注/Memo:
作者简介:刘仁柱(1955—),男,硕士,高级工程师 ,现任中海油气电集团管网信息监控中心主任。
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