石油化工设备技术 ›› 2021, Vol. 42 ›› Issue (5): 48-51.doi: 10.3969/j.issn.1006-8805.2021.05.009

• 腐蚀与防护 • 上一篇    

脱轻组分塔顶系统应力腐蚀开裂研究

陈刚   

  1. 上海赛科石油化工有限责任公司,上海 201507
  • 收稿日期:2020-10-10 接受日期:2021-08-25 出版日期:2021-09-15 发布日期:2021-09-09
  • 作者简介:陈刚,男,1992年毕业于华东化工学院(华东理工大学)化工机械与设备专业,硕士,主要从事设备维护管理、结构、材料等方面的工作,高级工程师。Email:chen.gang@secco.com.cn

On Stress Corrosion Cracking of Light-component Removal Column

Chen Gang   

  1. Shanghai Secco Petrochemical Co., Ltd., Shanghai, 201507
  • Received:2020-10-10 Accepted:2021-08-25 Online:2021-09-15 Published:2021-09-09

摘要: 通过金相观察、扫描电镜、化学成分分析等方法对苯乙烯装置脱轻组分塔顶系统裂纹开裂原因进行分析,判断出奥氏体不锈钢在连多硫酸介质中形成的应力腐蚀开裂是导致失效的原因。选用321、316L和2205三种材料进行应力腐蚀试验和电化学腐蚀试验,结果显示,316L和2205材料均具有较好耐连多硫酸应力腐蚀能力。上述结论可为该系统选材提供依据。

关键词: 脱轻组分塔, 连多硫酸, 应力腐蚀开裂

Abstract: The failure of stress corrosion cracking of light-component removal column was analyzed by means of metallographic, SEM, and chemical composition analysis. It was concluded that the failure was caused by stress corrosion cracking of austenitic stainless steel in polythionic acid environment. The electrochemical and SCC test of selected stainless steel of 321, 316L and 2205 were carried out. The results showed that 316L and 2205 steels have good SCC resistance to polythionic acid. The above conclusions can provide a basis for the selection of materials for the system.

Key words: light component removal column, polythionic acid, stress corrosion cracking/SCC