摘要
长庆石化制氢管线304不锈钢异径三通开裂失效,对开裂管件的化学成分、金相组织、力学性能、残余应力、断口等进行了检测分析。结果表明,管件材料化学成分符合相关技术标准要求;管件金相组织发生变化,存在形变马氏体组织,马氏体含量为36%;管件材料的抗拉强度与屈服强度较高,延伸率较小,冲击韧性较低;异径三通残余拉应力在200~480 MPa之间。材料中形成的马氏体相降低了304不锈钢的力学性能与抗氢损伤能力,在残余拉应力作用下,氢使材料中产生微裂纹,导致304不锈钢异径三通沿晶脆性断裂。
The crack failure occurred in the 304 stainless steel reducing tee on hydrogen production line.Through analyzing the results of chemical composition analysis,microstructure examination,mechanical properties test,residual stress test and fracture surface observation,it is shown that the pipe fitting material chemical composition conforms to the requirements of the pipeline steel technical standard;the microstructure changes and deformation martensite structure exists,the martensite content is as high as 36%;the tensile strength and yield strength increase,elongation and impact toughness decrease;reducing tee residual tensile stress is in between 200~480 MPa.The formation of martensite phase directly influences the mechanical properties of 304 stainless steel and hydrogen damage resistance.Under the influence of residual tensile stress,hydrogen induced martensite structure to produce microcracks,leading to intergranular brittle fracture of 304 stainless steel reducing tee.
作者
来维亚
杜小英
索涛
范磊
LAI Weiya;DU Xiaoying;SUO Tao;FAN Lei(State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,Xi'an,Shaanxi 710077,China;Changqing Petrochemical Company,CNPC,Xianyang,Shaanxi 712000,China)
出处
《石油管材与仪器》
2019年第6期70-74,共5页
Petroleum Tubular Goods & Instruments
基金
中国石油天然气集团公司科学研究与技术开发项目,项目编号为:2017D-2307,项目名称为:炼化关键设备制造、防腐和长周期运行技术开发应用
关键词
制氢
304不锈钢
残余应力
形变马氏体
失效分析
hydrogen production
304 stainless steel
residual stress
deformation martensite
failure analysis
