海上气田多相流量计球阀连接螺柱断裂原因  

Cause of fracture of ball valve connecting stud of multiphase flowmeter in offshore gas field

作　　者：何泽宇 曾海亚 冯电稳 杨中娜 杨阳 王骅钟 谈涛 HE Zeyu;ZENG Haiya;FENG Dianwen;YANG Zhongna;YANG Yang;WANG Huazhong;TAN Tao(CNOOC(Tianjin)Pipeline Engineering Technology Co.,Ltd.,Tianjin 300452,China;Tianjin Beihai Oil Human Resource Consulting Service Co.,Ltd.,Tianjin 300452,China;Tianjin Key Laboratory of Subsea Pipeline,Tianjin 300452,China;CNOOC Energy Technology&Services Limited Key Laboratory of Safety Guarantee Technology for Subsea Pipeline,Tianjin 300452,China)

机构地区：[1]中海油(天津)管道工程技术有限公司,天津300452 [2]天津北海油人力资源咨询服务有限公司,天津300452 [3]天津市海底管道重点实验室,天津300452 [4]海油发展海底管道安全服役保障技术重点实验室,天津300452

出　　处：《理化检验（物理分册）》2024年第12期67-71,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某海上气田高压多相流量计连接隔离球阀阀体螺柱发生断裂现象,采用宏观观察、化学成分分析、断口分析、硬度测试、金相检验等方法分析螺柱的断裂原因。结果表明:在海洋大气环境下及预紧力的作用下,螺柱发生应力腐蚀开裂现象,螺柱径向萌生了微裂纹,裂纹沿径向长大并扩展,当裂纹尺寸达到一定程度时,螺柱发生整体断裂。The fracture phenomenon of the valve body stud of the high-pressure multi-phase flowmeter connected to the isolation ball valve in an offshore gas field occurred.The fracture causes of the stud were analyzed by macroscopic observation,chemical composition analysis,fracture surface analysis,hardness test,metallographic examination and other methods.The results show that under the action of marine atmospheric environment and pre-tightening force,the stress corrosion cracking of the stud occured.The micro-cracks initiated in the radial direction of the stud,and the cracks grew and expanded along the radial direction.When the crack size reached a certain degree,the stud broke as a whole.

关 键 词：螺柱 应力腐蚀 沿晶断裂 微裂纹 预紧力 

分 类 号：TG115.2[金属学及工艺—物理冶金] TB31[金属学及工艺—金属学]