一段转化炉下集气管导淋管破裂原因分析

ANALYSIS OF THE FAILURE OF THE CONDUIT OF THE PRIMARY REFORMER

用光学显微镜、扫描电镜对一段炉下集气管鼓胀破裂的导淋管的宏观、微观组织，断口形貌进行了分析。结果表明，导淋管鼓胀破裂非蠕变损伤所致，而是超温运行所致；超温是导淋管阀门泄漏引起的。导淋管是先发生鼓胀而后破裂的，破裂前ＡＩＳＩ３１０导淋管析出大量σ相。

The macrograph, micrograph and fracture surface of a failiure conduit of the primary reformer were analyzed with optical microscope and SEM.It is shown that the failure of conduit was not caused by creep but by being in service at higher temperature which resulted from leak of the conduit valve.The conduit dilated first and finally broke.A large amount of phase σwas precipitated in AISI310 conduit before breaking.