微观组织对X80直缝焊管与高压氢相容性影响研究  

Effect of Microstructure on the Compatibility of X80 Straight Welded Pipe with High Pressure Hydrogen

作　　者：刘斌 韦奉[1,2] 牛辉 汪兵[3] 李拔 贾书君[3] 刘清友[3] LIU Bin;WEI Feng;NIU Hui;WANG Bing;LI Ba;JIA Shujun;LIU Qingyou(Chinese National Enginnering Research Center for Petroleum and Natural Gas Tubular Goods,Baoji 721008,Shaanxi,China;Baoji Petroleum Steel Pipe Co.,Ltd.,Baoji 721008,Shaanxi,China;Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]国家石油天然气管材工程技术研究中心,陕西宝鸡721008 [2]宝鸡石油钢管有限责任公司,陕西宝鸡721008 [3]钢铁研究总院有限公司,北京100081

出　　处：《焊管》2022年第11期1-9,共9页Welded Pipe and Tube

基　　金：中国石油天然气集团有限公司前瞻性基础性及战略性技术攻关课题“中长距离管道纯氢/掺氢输送关键技术研究”(项目编号2021DJ5002(JT))。

摘　　要：为研究不同组织X80直缝焊管与6.3 MPa氢气的相容性,采用扫描电镜分析、高压氢环境缺口试样慢拉伸试验等方法进行分析。结果表明,与6.3 MPa氮气条件相比,针状铁素体组织的Φ1422 mm钢管母材缺口试样在6.3 MPa氢气中抗拉强度、断面收缩率和拉伸位移损失率分别为5.1%、10.1%和1.3%;多边形铁素体+贝氏体组织的Φ1219 mm钢管母材缺口试样在6.3 MPa氢气中的抗拉强度、断面收缩率和拉伸位移的损失率分别为4.9%、62.8%和13.7%;针状铁素体Φ1422 mm钢管母材相比多边形铁素体+贝氏体组织Φ1219 mm钢管母材在6.3 MPa气态氢环境中具有更好的抗氢脆性能;Φ1422 mm钢管直焊缝和Φ1219 mm钢管直焊缝均为多边形铁素体组织;与氮气中相比,Φ1422 mm钢管直焊缝在6.3 MPa氢气中的抗拉强度、断面收缩率和拉伸位移损失率分别为4.4%、23.3%和10.2%;Φ1219 mm钢管直焊缝在6.3 MPa氢气中的抗拉强度、断面收缩率和拉伸位移损失率分别为2.7%、24.7%和10.4%。慢拉伸断口微观形貌表明6.3 MPa氢气的气体条件促进了氢致裂纹的萌生。In order to study the compatibility of two different microstructures X80 straight welded pipes with 6.3 MPa hydrogen,scanning electron microscopy(SEM)and slow tensile test of notched specimen were used to analyse.The results showed that,compared with the properties in 6.3 MPa nitrogen,the loss rates of tensile strength,reduction of area and tensile displacement of the notched specimen ofΦ1422 mm steel pipe base metal with acicular ferrite structure in 6.3 MPa hydrogen were 5.1%,10.1%and 1.3%;the loss rates of tensile strength,reduction of area and tensile displacement of the notched specimens ofΦ1219 mm steel pipe base material with polygonal ferrite+bainite structure were 4.9%,62.8%and 13.7%respectively in 6.3 MPa hydrogen.The acicular ferriteΦ1422 mm steel pipe base material has better hydrogen embrittlement resistance than polygonal ferrite+bainiteΦ1219 mm steel pipe base material in 6.3 MPa gaseous hydrogen environment.BothΦ1422 mm steel pipe straight weld andΦ1219 mm steel pipe straight weld were polygonal ferrite structure.Compared with nitrogen environment,the loss rates of tensile strength,area reduction and tensile displacement ofΦ1422 mm steel pipe straight weld in 6.3 MPa hydrogen are 4.4%,23.3%and 10.2%respectively,and the loss rates of tensile strength,area reduction and tensile displacement ofΦ1219 mm steel pipe straight weld in 6.3 MPa hydrogen are 2.7%,24.7%and 10.4%.The micro morphology of slow tensile fracture showed that 6.3 MPa hydrogen gas condition promoted the initiation of hydrogen induced cracks.

关 键 词：输氢管道 高压氢 慢拉伸试验 组织类型 

分 类 号：TG113.25[金属学及工艺—物理冶金]