X80钢级Ф1422 mm×38.5 mm大壁厚直缝埋弧焊管的开发及性能研究

Development and Performance Study of X80Φ1422 mm×38.5 mm Thick Wall SAWL Pipe

针对大壁厚直缝焊管的技术要求,通过对焊接、扩径等制造工艺的研究,开发出了X80钢级Φ1422 mm×38.5 mm直缝埋弧焊管,并掌握了“钢板-钢管”的性能变化规律。对焊管进行性能检验,结果表明,焊管管体屈服强度平均值为619~643 MPa,抗拉强度平均值为692~701 MPa,屈强比平均值为0.89~0.92,-22℃时DWTT剪切面积平均值为90%~94%;-10℃时管体冲击功平均值为401 J,焊缝冲击功平均值为165 J,热影响区冲击功平均值为294 J。其各项性能均满足Q/SY XG 0120.4—2019《西气东输四线天然气管道工程用X80级直缝埋弧焊管技术条件》和《D1422 mm×38.5 mm管材单炉试制程序及要求》的要求。这将为该焊管产品后续工业化生产提供技术支撑。

According to the technical requirements of thick wall submerged arc welded longitudinal(SAWL)pipe,the X80Φ1422 mm×38.5 mm SAWL pipe was developed through the research on the welding,expansion and other manufacturing processes.Moreover,changing rules of mechanical performance of plate-pipe have been mastered.Through the performance test of welding pipe,results showed that the average yield strength of welded pipe is between 619~643 MPa,the average tensile strength is between 692~701 MPa,the average yield ratio is between 0.89~0.92,and the average DWTT shear area is between 90%~94%at-22℃.The average impact energy of welded pipe is 401 J at-10℃,the average impact energy of weld is 165 J,and the average impact energy of HAZ is 294 J.Various performance indicators can meet requirements of Q/SY XG 0120.4—2019 Technical Specifications for X80 SAWL Line Pipes Used in Fourth West-east Gas Pipeline Project and Single Furnace Trial Production Procedures and Requirements of D1422 mm×38.5 mm Line Pipe.It can provide technical support for the subsequent industrial production of the welded pipe.