东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (12): 1790-1794.DOI: 10.12068/j.issn.1005-3026.2015.12.026

• 机械工程 • 上一篇    下一篇

FV520B钢在H2S/CO2环境下的应力腐蚀

孙蛟1,2, 陈颂英1, 丁进2,3, 李剑峰1   

  1. (1. 山东大学 机械工程学院, 山东 济南250061; 2. 山东大学(威海) 机电与信息工程学院, 山东 威海264209;3. 威海职业技术学院, 山东 威海264209)
  • 收稿日期:2015-02-05 修回日期:2015-02-05 出版日期:2015-12-15 发布日期:2015-12-07
  • 通讯作者: 孙蛟
  • 作者简介:孙蛟(1980-),男,山东威海人,山东大学讲师,博士; 李剑峰(1963-),男,山东邹平人,山东大学教授,博士生导师.
  • 基金资助:
    国家重点基础研究发展计划项目(2011CB013401); 中国留学基金管理委员会资助项目(201308370116).

Stress Corrosion Behavior of FV520B Steel in H2S/CO2 Environment

SUN Jiao1,2, CHEN Song-ying1, DING Jin2,3, LI Jian-feng1   

  1. 1. School of Mechanical Engineering, Shandong University, Jinan 250061, China; 2. School of Mechanical, Electrical and Information Engineering, Shandong University, Weihai 264209,China; 3. Weihai Vocational College, Weihai 264209, China.
  • Received:2015-02-05 Revised:2015-02-05 Online:2015-12-15 Published:2015-12-07
  • Contact: LI Jian-feng
  • About author:-
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摘要: 采用慢应变速率应力腐蚀拉伸试验方法,开展了FV520B钢在模拟管道压缩机叶轮腐蚀介质环境中的高温、高压应力腐蚀开裂(SCC)研究,探讨了H2S浓度、CO2浓度、温度、压力等环境参数对FV520B钢应力腐蚀开裂的影响规律和作用机制.试验结果表明,H2S起主要腐蚀作用,应力腐蚀敏感指数随H2S浓度的增加而增大,而压力在一定范围内对应力腐蚀敏感指数影响不大.通过试样断口微观形貌观察分析,研究其应力腐蚀行为和机理,并计算不同环境参数下的应力腐蚀敏感指数,运用回归分析方法建立了FV520B钢在H2S/CO2环境中应力腐蚀敏感指数与介质浓度、温度、压力等环境参数之间的数学模型,表明H2S浓度、温度对应力腐蚀敏感指数的影响较为显著,同时,4种参数对应力腐蚀敏感指数产生交互作用.

关键词: 离心式压缩机, FV520B, 应力腐蚀, H2S, CO2 , 回归分析

Abstract: Based on simulating corrosion environments of centrifugal compressor for natural gas pipe line , the stress corrosion cracking (SCC) of FV520B steel was studied by slow strain rate testing (SSRT) method, and the effecting law and action mechanism of concentration of H2S and CO2, temperature and pressure on the SCC were discussed. The results show that H2S plays a major role on the corrosion, the stress corrosion sensitivity index (IS) increases with the increase of concentration of H2S, while the stress in certain range has little effect. We researched the corrosion behavior of FV520B steel by analyzing the micro fracture morphology, calculated the IS in different environment parameters. Finally, the mathematical model of the environment parameters and the IS of FV520B was established with the regression analysis method. The model shows that the influence of H2S concentration and temperature on the IS is significant, and four parameters have interaction on the IS.

Key words: centrifugal compressor, FV520B, stress corrosion, H2S, CO2, regression analysis

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