某管道环焊缝开裂失效分析
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摘要
通过化学成分、力学性能测试,断口、金相与载荷分析,结合管道注氮作业现场调查情况,分析了某输气管线环焊缝开裂原因。结果表明:该管线环焊缝开裂主要由于注氮作业人员对注氮温度控制不当,造成低温环境,低温致管材性能脆化,在由温度变化产生的轴向拉伸应力及焊缝残余应力共同作用下,在焊根处未熔合与夹渣缺陷处起裂并脆性扩展。
The failure reason of girth weld cracking was studied through chemical composition, mechanical property tests fracture, metallography and load analyses and combined with the field investigation of the nitrogen injection operation. The results show that the reason of girth weld cracking is improper control of nitrogen injection temperature by the nitrogen injection operation staff, which causes the low temperature environment so that material properties are severely brittle, and brittle fracture of girth weld occurs and propagates in the root of the weld with incomplete fusion and slag inclusion under the combined effect of the axial tensile stress caused by temperature change and weld residual stress.
The failure reason of girth weld cracking was studied through chemical composition, mechanical property tests fracture, metallography and load analyses and combined with the field investigation of the nitrogen injection operation. The results show that the reason of girth weld cracking is improper control of nitrogen injection temperature by the nitrogen injection operation staff, which causes the low temperature environment so that material properties are severely brittle, and brittle fracture of girth weld occurs and propagates in the root of the weld with incomplete fusion and slag inclusion under the combined effect of the axial tensile stress caused by temperature change and weld residual stress.
引文
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[2]袁琴,赵波,俞平.热处理对20号钢韧脆转变温度的影响[J].钢管,2013,42(6):58-61.
[3]国家能源局.含缺陷油气输送管道剩余强度评价方法:SY/T6477-2017[S].北京:石油工业出版社,2017.
[4]中华人民共和国住房和城乡建设部.输气管道设计规范:GB50251-2015[S].北京:中国计划出版社,2015.
[5]齐赵敏.海工钢管构件对接焊缝应力集中系数分析[D].重庆:重庆交通大学,2013.
[6]钟群鹏,赵子华.断口学[M].北京:高等教育出版社,2006.
[7]国家发展和改革委员会.钢质管道焊接及验收:SY/T4103-2006[S].北京:石油工业出版社,2006.