某酸性气田集输管线三通管件裂纹失效分析  

Failure Analysis on Cracking of a Gathering Pipeline Tee in One Sour Gas Field

作　　者：廖芸[1,2] 李科[1,2] 鞠岚[1,2] 陈勇彬[1,2] 张仁勇[1,2] 

机构地区：[1]中国石油集团工程设计有限责任公司西南分公司,成都610017 [2]中国石油天然气集团公司石油管工程重点实验室酸性气田管材腐蚀与防护研究室,成都610017

出　　处：《理化检验（物理分册）》2015年第8期596-599,602,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某酸性气田集输管线16Mn钢三通管件服役1a(年)后出现裂纹,通过宏观分析、化学成分分析,硬度测试、金相检验、腐蚀产物分析以及扫描电镜断口分析等方法,对三通管件的开裂原因进行了分析。结果表明:三通管件开裂为硫化物应力腐蚀开裂,材料硬度偏高和存在上贝氏体组织是造成管件发生硫化物应力腐蚀开裂的主要原因。建议严格控制三通管件原材料复验以及产品质量检验,同时定期对气田在役三通管件等关键部位进行无损检测,包括探伤、硬度检测等,预防类似事件的再次发生。Cracks were found on a 16 Mn steel tee in one sour gas field after a year of service,and the cracking reasons were analyzed by means of macroscopic observation,chemical compositions analysis,hardness test,metallographic examination,SEM observation and corrosion products analysis.The results show that the cracking of the tee was sulfide stress corrosion cracking,and the higher hardness and existence of upper bainite structure were main reasons for the cracking.It was recommended that the retesting for raw materials and production quality had to be strictly controlled,and non destructive testing should be performed periodically to the key positions in order to prevent similar incidents from happening again,including flaw detection,hardness testing,etc.

关 键 词：16MN钢 三通 裂纹 硬度 上贝氏体 硫化物应力腐蚀开裂 

分 类 号：TG142.15[一般工业技术—材料科学与工程] TE931.2[金属学及工艺—金属材料]