石油化工设备技术 ›› 2022, Vol. 43 ›› Issue (2): 52-54,58.doi: 10.3969/j.issn.1006-8805.2022.02.011

• 检维修技术 • 上一篇    

催化裂化装置滑阀螺栓断裂失效分析

汤东征1,马晶晶2,张 勇2,汤鹏杰3   

  1. 1. 扬子石化-巴斯夫有限责任公司,江苏 南京 210048;
    2.中国石油化工股份有限公司金陵分公司,江苏 南京 210033;
    3. 南京金创有色金属科技发展有限公司,江苏 南京 211178
  • 收稿日期:2021-12-02 接受日期:2022-02-28 出版日期:2022-03-15 发布日期:2022-03-15
  • 通讯作者: 汤鹏杰 E-mail:tangdz@basf-ypc.com.cn
  • 作者简介:汤东征,2003年毕业于南京工业大学化工过程机械专业,硕士,主要研究方向流体密封与机械,工程师。
  • 基金资助:
    专利:喷嘴装置、催化裂化系统及喷嘴疏通方法(专利号201710066119.2)

Failure Analysis on Bolt Fracture of Slide Valve in Catalytic Cracking Unit

Tang Dongzheng1, Ma Jingjing2, Zhang Yong2, Tang Pengjie3   

  1. 1. BASF-YPC Company Limited, Nanjing, Jiangsu, 210048;
    2. SINOPEC Jinling Company, Nanjing, Jiangsu, 210033;
    3. Nanjing Jinchuang Non-Ferrous Metal Technology Limited Company, Nanjing, Jiangsu, 211178
  • Received:2021-12-02 Accepted:2022-02-28 Online:2022-03-15 Published:2022-03-15
  • Contact: Tang Pengjie E-mail:tangdz@basf-ypc.com.cn

摘要: 某公司催化裂化装置滑阀GH4033螺栓使用1年即发生断裂。为查明原因,对断裂螺栓进行宏观、化学成分、显微组织、断口以及微观分析。结果表明:该螺栓为沿晶蠕变断裂。因其供货状态不符合质保要求,奥氏体晶粒粗大,仅有少量碳化物沿晶析出,弱化了细晶强化和晶界强化作用,降低了螺栓的高温蠕变性能,在高温高应力作用下,萌生蠕变孔洞形成微裂纹,裂纹沿晶扩展,致使螺栓过早断裂失效。

关键词: 催化裂化, 滑阀, GH4033, 螺栓, 蠕变断裂

Abstract: The GH4033 bolt of the slide valve in an FCC unit was fractured after being in use for one year. In order to find out the fracture reason, macroscopic analysis, chemical composition, microstructure, fracture and microscopic analysis of the broken bolt were carried out. The results showed that the bolt was fractured by intergranular creep. Because the availability state did not meet the requirements of quality assurance, the austenitic grains were coarse and only a small amount of carbides precipitated along austenite grain boundary, so the fine grain strengthening and grain boundary strengthening were weakened; the high temperature creep performance of the bolt was reduced; under the action of high temperature and high stress, the micro cracks were formed due to the appearance of creep cavity, and the cracks expanded along the grain boundary, which led to the early rupture failure of the bolt.

Key words: catalytic cracking, slide valve, GH4033, bolt, creep rupture