| 合成气装置中变一段换热器膨胀节断裂分析 |
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| 引用本文： | 张维波,张洪军,王东,郑启文. 合成气装置中变一段换热器膨胀节断裂分析[J]. 压力容器, 2007, 24(5): 36-40 |
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| 作者姓名： | 张维波 张洪军 王东 郑启文 |
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| 作者单位： | 1. 中国石油吉林石化公司,吉林,吉林,132022
2. 哈尔滨焊接研究所,黑龙江,哈尔滨,150080 |
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| 摘 要： | 某厂中变一段换热器新换上的0Cr18Ni9不锈钢制U形膨胀节仅运行2个月即发生突然断裂。检验表明,断裂起始于膨胀节波峰外壁,属高应力下应力腐蚀开裂。外保温材料中含Cl^-、S、Na等组份,并较长时间被水浸渍;膨胀节材料已整体严重脆化,显微组织中马氏体所占比例达到50%,显微硬度达到Hv400左右;焊接质量差;膨胀节波峰处应力较高;介质中含氢等是引起破坏的主要原因。本文还提出防止和控制上述问题的技术措施。
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| 关 键 词： | U形膨胀节 应力腐蚀开裂 防治措施 |
| 文章编号： | 1001-4837（2007）05-0036-05 |
| 修稿时间： | 2007-03-26 |
Fracture Analysis of Expansion Joint for Middle Transform First-section Heat Exchanger of Synthesis Gas Plant |
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| ZHANG Wei-bo,ZHANG Hong-jun,WANG Dong,ZHENG Qi-wen. Fracture Analysis of Expansion Joint for Middle Transform First-section Heat Exchanger of Synthesis Gas Plant[J]. Pressure Vessel Technology, 2007, 24(5): 36-40 |
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| Authors: | ZHANG Wei-bo ZHANG Hong-jun WANG Dong ZHENG Qi-wen |
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| Affiliation: | 1. Jilin Petrochemical Co., PetroChina Co., Ltd., Jilin 132022, China; 2. Harbin Research Institute of Welding, Harbin 150080, China |
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| Abstract: | The fracture accident of a new U-type expansion joint of middle transform first-section heat exchanger occurred suddenly in service for only two months,it was made of type 0Cr18Ni9 austenitic stainless steel.Test showed that,above fracture originated from out-wall of the expansion joint and was stress corrosion cracking at high stress level.Causes of the accident were:out-insulating-materials contained Cl-,S,Na,etc,and were soaked by water for longer time;expansion joint materials whole were embrittle seriously and its martensite content was about 50% and micro-hardness were about Hv400;welding quality was inferior;Stress on wave crest was higher;there was hydrogen in medium and so on.The corresponding prevention measures were put forward. |
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| Keywords: | U - type expansion joint stress corrosion cracking prevention measures |
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