高强度石油套管冲击性能波动研究  

Research on Impact Property Performance Fluctuation of Hi-strength Oil Casing

作　　者：赵映辉[1] 夏文斌[1] 周勇[1] 赵健明[1] 汤松辉 吴润[2] ZHAO Yinghui;XIA Wenbin;ZHOU Yong;ZHAO Jianming;TANG Songhui;WU Run(Hengyang Valin Steel Tube Co.,Ltd.,Hengyang 421001,China;Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]衡阳华菱钢管有限公司,湖南衡阳421001 [2]武汉科技大学,湖北武汉430081

出　　处：《钢管》2023年第4期65-69,共5页Steel Pipe

摘　　要：为了探究高强度石油套管冲击性能波动的原因,在同批次调质热处理后的无缝钢管上取系列试样,分析冲击功相差3.7倍的试样的断口形貌、显微组织及夹杂物。通过金相观察及分析统计,冲击性能低和高的试样的组织均为回火索氏体+少量铁素体。SEM结果表明,少数在铁素体周围的碳化物尺寸较大,且组织均匀性略差,从而导致冲击性能变差。TEM结果结合碳化物定量统计表明,冲击性能好的试样,高碳部分的碳含量为0.137%,A_(c3)为902℃,其晶粒相对较细,高温回火后,组织均匀性较好,碳化物均匀弥散分布于晶界和基体上。冲击性能低的主要原因是淬火后的回火温度过高,造成碳化物集聚长大。In order to investigate the cause for impact property fluctuation,a series of samples are taken from the quenched and tempered seamless steel pipes of the same batch to analyze the fracture morphology,the microstructure and the inclusions of the specimens with 3.7 times of impact energy difference.It is identified via the metallographic observation and the analytic statistics the microstructures of the specimens with low and high impact properties are the same,i.e.,the tempered sorbite plus little ferrite.The SEM result shows that a few carbides around the ferrite are larger in size and slightly poor in structural homogeneity,resulting in poor impact property.And it is also revealed via the TEM result and the quantitative statistics of carbides that the specimen with good impact performance has a carbon content of 0.137wt.%in the high-carbon part,and its A_(c3)=902℃and grain is relatively fine.After high-temperature tempering,the structure homogeneity is good,and the carbides are uniformly distributed on the grain boundary and the matrix.The main reason for the low impact property is that the tempering temperature after quenching is too high,which causes the carbide to gather and grow up.

关 键 词：石油套管 高强度 冲击性能 显微组织 碳含量 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]