辽宁石油化工大学学报Issue(2)：57-60,4.DOI:10.3696/j.issn.1672-6952.2014.02.015
省煤器联箱接管座与管排焊接接头泄漏原因分析
Analysis of Leakage Reasons for Joint of Tube of Header and Weld Joints of Coil Tube on Coal Economizer
摘要
Abstract
Through macro-analysis, chemical composition analysis, metallographic observation, and SEM, the leakage reasons for joint of tube of header and coil tube of coal economizer was analyzed.The results show that the alloy element compositions of welded tubes and conversion strength both met the standard of GB 5310-2008.The grains at fusion zone and overheated zone were coarse and even formed widmanstaten structure which made the performance of the zone weaken.Leakage from the joint of tube of header and coil tube of coal economizer resulted in the micro cracks in the weakened region of fusion and overheated zone under the thermal stress.Though through-wall crack was not formed after micro cracks initiation,micro cracks resulted in crevice corrosion and the crevice corrosion accelerated crack propagation from the inside outwords,and eventually caused the leakage.关键词
省煤器/联箱/焊接接头/泄漏/分析Key words
Coal economizer/Tube of header/Welded joint/Leakage/Analysis分类
矿业与冶金引用本文复制引用
季明,敖峰,胡传顺,田景涛..省煤器联箱接管座与管排焊接接头泄漏原因分析[J].辽宁石油化工大学学报,2014,(2):57-60,4.基金项目
辽宁省教育厅科学技术研究项目(LS2010098)。 （LS2010098）
