石油化工设备技术 ›› 2023, Vol. 44 ›› Issue (3): 45-49.doi: 10.3969/j.issn.1006-8805.2023.03.010

• 腐蚀与防护 • 上一篇    

炼化装置奥氏体不锈钢连多硫酸应力腐蚀开裂分析

胡 佳   

  1. 中国石化沧州炼化公司,河北 沧州 061000
  • 收稿日期:2023-02-18 接受日期:2023-04-30 出版日期:2023-05-15 发布日期:2023-06-06
  • 作者简介:胡佳,男,1995年毕业于西北大学化工设备与机械专业,学士,长期从事设备管理工作,现任中国石化沧州炼化公司副总经理,高级工程师。

On Stress Corrosion Cracking of Austenitic Stainless Steel with Polysulphuric Acid in Refining and Chemical Units

Hu Jia   

  1. Cangzhou Refining and Chemical Company, SINOPEC, Cangzhou, Hebei, 061000
  • Received:2023-02-18 Accepted:2023-04-30 Online:2023-05-15 Published:2023-06-06

摘要: 奥氏体不锈钢的连多硫酸应力腐蚀开裂是炼化装置停工检修期间经常遇到的一种腐蚀失效类型。近年来随着炼化装置不断进行材质升级,奥氏体不锈钢的应用越来越广泛,奥氏体不锈钢发生连多硫酸应力腐蚀开裂的失效案例也越发多见。文章总结分析了连多硫酸应力腐蚀开裂的发生条件、腐蚀特征、发展过程及影响因素,探讨了炼化装置应对连多硫酸应力腐蚀开裂的可行防护措施,并对连多硫酸应力腐蚀开裂相关研究尚无确定结论的几个问题进行了分析阐述。

关键词: 炼化装置, 奥氏体不锈钢, 连多硫酸, 应力腐蚀开裂, 敏化

Abstract: Stress corrosion cracking (SCC) of austenitic stainless steel is a kind of corrosion failure frequently occurring during shutdown and maintenance of refining and chemical units. In recent years, with the continuous material upgrading of refining and chemical units, austenitic stainless steel is increasingly applied and the failure cases of stress corrosion cracking of austenitic stainless steel are more and more common. This paper summarized and analyzed the occurrence conditions, corrosion characteristics, development process and influencing factors of stress corrosion cracking of polysulphuric acid. It discussed the feasible protective measures against stress corrosion cracking of polysulphuric acid in refining and chemical units. The paper also analyzed and expounded several problems related to stress corrosion cracking of polysulphuric acid.

Key words: refinery and chemical unit, austenitic stainless steel, polythionic acid, stress corrosion cracking/SCC, sensitization