不同回火温度对X70管线钢管焊缝组织性能的影响  

Influence of Different Tempering Temperatures on X70 Line Pipe Weld Microstructure Performance

作　　者：何莹[1,2] 张卫锋 

机构地区：[1]中国石油管道学院,河北廊坊065000 [2]河北石油职业技术学院,河北廊坊065000 [3]中国石油管道局工程有限公司第四分公司,河北廊坊065000

出　　处：《焊管》2017年第5期36-40,共5页Welded Pipe and Tube

摘　　要：为了研究热煨弯管制作过程中回火温度对X70直缝埋弧焊管焊缝组织性能的影响规律,开展了热处理试验,并对试样进行了力学性能检测及金相分析,研究了不同回火温度对X70焊管焊缝热影响区韧性的影响。研究结果采表明,采用500~550℃回火处理时,弯管焊接接头冲击韧性和强度匹配最佳;采用570~600℃回火处理时,焊缝和热影响区冲击韧性迅速恶化,已不适宜用作油气输送管线用管。In order to study the influence rule of tempering temperature on X70 SAWL pipe weld microstructure performance in hot-bending bends manufacturing proeess, the heat treatment test was carried out, the mechanical property testing and metallographie analysis were conducted on the sample, and the influences of different tempering temperature on weld HAZ toughness of X70 welded pipe was studied. The results showed that the tempering treatment in 500-550℃, the matching of hot-bending bends welded joint impact toughness and strength was optimum; the tempering treatment in 570~600℃, the impaet toughness of wehl and HAZ deteriorated rapidly, was not suitahle for pipeline used for transportation oil and gas.

关 键 词：焊管 X70直缝埋弧焊管 热煨弯管 焊缝性能 热处理 回火温度 

分 类 号：TG456[金属学及工艺—焊接]