空冷器管头泄露原因分析  

Cause analysis of tube head leakage of air cooler

作　　者：郭海霞[1] 王世宁[1] 蔡海琛 张佳旗 GUO Haixia;WANG Shining;CAI Haichen;ZHANG Jiaqi(Luoyang Ship Material Research Institute,Luoyang 471023,China)

机构地区：[1]洛阳船舶材料研究所,河南洛阳471023

出　　处：《物理测试》2023年第1期46-50,共5页Physics Examination and Testing

摘　　要：柴油加氢精制空冷器在开车运行的硫化过程中发生管头(管板焊接接头的焊缝处)泄露现象。通过对空冷器管头的宏观检测、成分与组织分析、腐蚀特征分析找到了失效模式和原因。失效模式为硫化物应力腐蚀。这是由于焊接过程控制不当,焊接冷却速度较快,导致淬硬组织的形成;焊后热处理不充分,未改善淬硬组织。The leakage of pipe head(at the weld of tube sheet welded joint)occurred in the vulcanization process of diesel hydrotreating air cooler during running.The failure mode and reason were found through the microscopical examination,composition and microstructure analysis,and corrosion characteristic analysis of the pipe head of air cooler.It was found that the failure mode was sulfide stress corrosion.There were two reasons.One reason is the improper control of welding process.The welding cooling speed was fast,resulting in the formation of hardened structure.Another reason is the post weld heat treatment(PWHT)was also insufficient and the hardened structure was not improved.

关 键 词：硫化物应力腐蚀 硬度 马氏体 

分 类 号：TE96[石油与天然气工程—石油机械设备]