N80-1套管组织异常原因分析及改进  

Investigation of Causes for Abnormal Microstructure of N80-1 Casing and Relevant Corrective Measures

作　　者：朱林[1] 邹喜洋[1] 程向龙[1] 胡翔[1] ZHU Lin;ZOU Xiyang;CHENG Xianglong;HU Xiang(Hengyang Valin Steel Tube Co.,Ltd.,Hengyang 421001,China)

机构地区：[1]衡阳华菱钢管有限公司,湖南衡阳421001

出　　处：《钢管》2021年第5期53-56,共4页Steel Pipe

摘　　要：介绍了N80-1套管管端的异常形貌特征,分析了N80-1套管的力学性能和异常组织形貌及显微硬度,探讨了异常组织形成的根本原因,并给出了改进措施。分析认为:带状分布的贝氏体是造成N80-1套管端部形貌异常的根本原因;在现行的生产工艺条件下,降低钢中C和Mn的含量能够消除N80-1套管中的异常贝氏体组织并使材料获得理想的屈服强度,同时可以大幅度提高材料的冲击韧性。Described here are the morphological abnormal characteristics as observed at the end of the N80-1 casing.Also analyzed are the mechanical properties,the abnormal structural morphology and micro-hardness of the casing.Furthermore,the root cause for the said abnormal microstructure is investigated,and accordingly countermeasures are put forward.The analysis result reveals that it is the banded bainite structure that acts as the root cause for the morphological abnormality as observed at the end of N80-1 casing.Therefore under the present manufacturing process conditions,owing to reducing the C and Mn contents in the steel the abnormal hainite structure of the casing can be eliminated,and meanwhile the yield strength of the material can be controlled to the ideal level,and its impact toughness can be dramatically improved.

关 键 词：套管 N80-1 带状组织 屈服强度 冲击韧性 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]