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首页> 外文会议>European Corrosion Congress >Stress Relaxation Cracking of TP 347H SS Flange Weld Joints on Reactor Charge Heater Manifold in Propane De-Hydrogenation Unit
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Stress Relaxation Cracking of TP 347H SS Flange Weld Joints on Reactor Charge Heater Manifold in Propane De-Hydrogenation Unit

机译：TP 347H SS法兰焊接接头在丙烷脱氢装置中的TP 347H SS法兰焊接接头的应力松弛裂缝

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摘要

This paper discuss about Stress Relaxation Cracking observed on nozzle weld joints in Reactor Charge Heater manifolds of Propane Dehydrogenation Unit. The metallurgy of the Charge Heater Tube and the manifold is Type 347H Stainless Steel. Operating temperature of the heater is 620-650degC. After 6 months of operation, a crack was observed on the HAZ of an inspection nozzle flange weld joint at the outlet manifold. Subsequent inspection of other nozzles revealed that 13 out of 16 nozzle flanges in inlet/outlet manifold have developed crack. All cracks were observed on the Coarse Grained Heat Affected Zone (CGHAZ) of flange side of nozzle weld joints, where transition hub thickness is comparatively higher than the mating pipe. External undercut on the weld joint acted as the stress raiser. Micro hardness measurement, Optical Microscopy, Scanning Electron Microscope/Energy Dispersive X-Ray Spectroscopy (SEM/EDS) microanalysis was used to ascertain the failure mechanism as Stress Relaxation Cracking. All the failed flanges were replaced in kind and Post Weld Heat Treatment (PWHT) was carried out.
机译：本文讨论了丙烷脱氢单元反应堆电荷歧管中的喷嘴焊接接头观察到的应力松弛裂缝。电荷加热器管和歧管的冶金是347h不锈钢。加热器的工作温度为620-650DEGC。操作6个月后，在出口歧管处的检查喷嘴法兰焊接接头的HAZ上观察到裂缝。随后检查其他喷嘴的检查显示入口/出口歧管中16个喷嘴凸缘中的13个发育裂缝。在喷嘴焊接接头的法兰侧的粗粒热影响区（CGHAZ）上观察到所有裂缝，其中过渡毂厚度比配合管相对高。焊接接头上的外部底切充当应力升降机。微型硬度测量，光学显微镜，扫描电子显微镜/能量分散X射线光谱（SEM / EDS）微量分析用于确定应力松弛开裂的故障机制。所有失败的法兰都被替换为实物，并进行焊接后热处理（PWHT）进行。

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