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[1]李加庆,梁辉龙,冯智雨,等.水和氧杂质作用下管线钢的液氨应力腐蚀行为[J].油气储运,2025,44(01):1-11.
　LI Jiaqing,LIANG Huilong,FENG Zhiyu,et al.Liquid ammonia stress corrosion behavior of pipeline steel under water and oxygen impurities[J].Oil & Gas Storage and Transportation,2025,44(01):1-11.
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水和氧杂质作用下管线钢的液氨应力腐蚀行为

《油气储运》[ISSN:1000-8241/CN:13-1093/TE] 卷: 44 期数: 2025年01期 页码: 1-11 栏目: 出版日期: 2025-01-25
Title:
Liquid ammonia stress corrosion behavior of pipeline steel under water and oxygen impurities
作者:
李加庆; 梁辉龙; 冯智雨; 尹鹏博; 滕霖; 张朱武; 罗宇; 江莉龙
福州大学化工学院·化肥催化剂国家工程研究中心·清源创新实验室
Author(s):
LI Jiaqing; LIANG Huilong; FENG Zhiyu; YIN Pengbo; TENG Lin*; ZHANG Zhuwu; LUO Yu; JIANG Lilong
College of Chemical Engineering, Fuzhou University//National Engineering Research Center of Chemical Fertilizer Catalyst//Qingyuan Innovation Laboratory
关键词:
液氨管道; 应力腐蚀; 腐蚀速率; 应力腐蚀敏感性指数; 脆性断裂
Keywords:
liquid ammonia pipeline;  stress corrosion cracking (SCC);  corrosion rate;  stress corrosion cracking susceptibility index;  brittle fracture
分类号:
TE832
文献标志码:
A
摘要:
【目的】管线钢作为一种高强度低合金钢，可用于液氨资源大规模长距离管道运输。然而液氨储运环境复杂，当液氨中混入空气、水等杂质后，管线钢将面临液氨应力腐蚀问题，严重威胁管道服役安全。因此，探究复杂输送环境下的液氨应力腐蚀规律对保障液氨管道储运安全至关重要。【方法】为测试管线钢的液氨应力腐蚀行为，开展不同杂质影响下的液氨腐蚀实验和慢应变速率拉伸实验，并结合断口形貌表征分析及硬度测试情况，分别从腐蚀速率、力学性能减损、应力腐蚀敏感性指数及微观形貌演化特征等方面对管线钢液氨应力腐蚀进行定量分析与探究。【结果】管线钢在纯液氨环境中的腐蚀速率和应力腐蚀倾向最小，应力腐蚀敏感性指数为75.914%；随着水含量的增加，应力腐蚀倾向略微增大，应力腐蚀敏感性指数轻微减少。氧的混入可使管道表面形成硬而脆的腐蚀产物，降低应力腐蚀敏感性指数，增大管线钢断口处的硬度，诱使断口出现解理面与二次裂纹，断裂行为逐渐趋向脆性断裂。【结论】在液氨管道设计和运行中，应严格控制氧和水杂质含量，考虑应力腐蚀敏感性指数下限，减少液氨应力腐蚀开裂风险，确保液氨管道运行的本质安全。
Abstract:
[Objective] Classified as a high-strength low-alloy steel, pipeline steel is suitable for large-scale, long-distance pipeline transportation of liquid ammonia. However, in complex storage and transportation environments, impurities such as air and water in liquid ammonia pose a significant risk of stress corrosion cracking (SCC) to pipeline steel, severely threatening the safety of pipeline operation. Therefore, it is crucial to explore the patterns of stress corrosion due to liquid ammonia under these complex transportation conditions to ensure the safety of liquid ammonia pipeline storage and transportation. [Methods] Corrosion experiments and tensile experiments at slow strain rates were conducted using liquid ammonia with different impurities, to identify the SCC behaviors of pipeline steel. Based on results from morphological characterization and hardness testing for fractures, a quantitative analysis examined the stress corrosion cracking of pipeline steel due to liquid ammonia, in terms of corrosion rates, degradation of mechanical properties, SCC susceptibility indexes, and evolutionary features of micro-morphologies. [Results] The pure liquid ammonia environment exhibited the lowest corrosion rate and stress corrosion cracking tendency in pipeline steel, with a stress corrosion cracking (SCC) susceptibility index recorded at 75.914%. As water content increased, the SCC tendency rose gently, while the SCC susceptibility index decreased slightly. The introduction of oxygen led to the formation of hard and brittle corrosion products on the pipeline surface, which reduced the SCC susceptibility index, increased hardness at the fractures of the pipeline steel, and induced cleavage planes and secondary cracks at the fractures. Consequently, the fracture behavior gradually shifted toward a tendency for brittle fractures. [Conclusion] In the design and operation of liquid ammonia pipelines, it is crucial to strictly control the content of impurities, particularly oxygen and water. Establishing a lower limit for the SCC susceptibility index is essential to minimize the risk of SCC in liquid ammonia environments, thereby ensuring the intrinsic safety of liquid ammonia pipeline operations.

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备注/Memo

作者简介：李加庆，男，1991年生，副教授，2021年博士毕业于澳大利亚伍伦贡大学机械工程专业，现主要从事新能源结构材料与装备氢脆与应力腐蚀开裂及失效分析等方面的研究工作。地址：福建省福州市福州大学城乌龙江北大道2号，350108。电话：18259062556。Email：jiaqing@fzu.edu.cn
通信作者：滕霖，男，1991年生，副教授，2019年博士毕业于中国石油大学（华东）油气储运工程专业，现主要从事新能源储运方向的研究工作。地址：福建省福州市福州大学城乌龙江北大道2号，350108。电话：18266635171。Email：tenglin@fzu.edu.cn

更新日期/Last Update: 2024-11-12