裂解炉管焊缝开裂原因分析  

Failure Analysis of Weld Cracking of Fissile Furnace Pipe

作　　者：丁晓非[1] 谢忠东[2] 林艾光[2] 王富岗[1] 

机构地区：[1]大连理工大学,大连116023 [2]大连水产学院,大连116023

出　　处：《失效分析与预防》2008年第2期48-52,共5页Failure Analysis and Prevention

摘　　要：通过对裂解炉管进行宏观变形检查、力学性能分析、炉管及焊缝成分分析和显微组织分析等,确定了炉管焊缝开裂的失效原因。结果表明,炉管材质及其力学性能符合技术条件要求;炉管焊缝开裂的主要原因是由于焊丝材料选用了蠕变抗力较低的Inconel82钢,而非与管材同材质的36XS钢。而焊缝处实际使用温度较高,造成该处材料渗碳和氧化严重,降低了材料蠕变抗力也是造成焊缝开裂的原因之一。The failure cause of fissile furnace pipes is analyzed by micro-appearance inspection, chemical composition and mechanical property analysis, and microstructure observation. The results show that the material and mechanical properties of the furnace pipes are consistent with the technical demand. The main cause of weld cracking is that the material of the weld wires is not 36XS steel, which the furnace pipes are made from, but Inconel82 steel with lower creep resistance. Another cause of weld cracking is the decrease of the creep resistance of the weld material. The decrease of the creep resistance is caused by carbonization and heavy oxidation resulting from higher practical usage temperature.

关 键 词：失效 裂解炉 焊缝开裂 蠕变 

分 类 号：U671.84[交通运输工程—船舶及航道工程]