X70厚壁海底管线钢管研制  

Research and Development of X70 Steel Pipe with Heavy Wall Thickness Used in Submarine Pipeline

作　　者：牛爱军[1,2] 毕宗岳[1,2] 牛辉[1,2] 赵红波[1,2] 黄晓辉[1,2] 张万鹏[1,2] 

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钢管研究院,陕西宝鸡721008

出　　处：《焊管》2013年第10期26-30,35,共6页Welded Pipe and Tube

基　　金：国家高技术研究发展计划(863计划)课题:深海油气输运高强厚壁管材关键技术研究(2013AA09A219)

摘　　要：根据我国南海深海管线用钢管的技术要求,开发出了厚壁X70钢级φ765.2mm×31.8mm海底管线钢管。通过对钢管进行检测:钢管管体纵向和横向屈服强度≥550MPa,抗拉强度≥660MPa,屈强比最低达到0.81,焊缝抗拉强度达695MPa,均匀延伸率达到了7.6%,断后伸长率达到54%;在-20℃下管体冲击功平均值为340J,焊接接头冲击功平均值最低为168J;在0℃下管体CTOD特征值δm最高达到0.688mm,焊接接头最小为0.222mm,热影响区最小为0.280mm。钢管管体母材、热影响区、焊缝部位的抗氢致开裂、硫化物应力腐蚀及盐雾腐蚀性能良好。试验结果表明研制的X70钢管具有优良的强塑性、低温韧性、断裂韧性及耐腐蚀性能,适用于海洋服役环境的油气输送。According to the requirements of steel pipe used in deep sea pipeline of the south China,the X70 grade q5765.2 minx 31.8 mm submarine pipeline with heavy wall thickness was developed successfully. Through the test of steel pipe. The longitudinal and the transverse yield strength both are greater than or equal to 550 MPa,the tensile strength is not less than 666 MPa,the yield ratio shows the lowest 0.81 ,the tensile strength of the weld reaches 695 MPa. And the uniform elongation reaches 7.6% and the percentages elongation after fracture reaches 54% of the pipe body. The average impact energy of pipe body is 340J and in weld the lowest value is 168 J under -20 ~C. The CTOD characteristic value 8m is up to 0.688 mm in the pipe body at 0 C ,the smallest is 0.222 mm in welded joint,and the smallest is 0.280 mm in HAZ. The resistance to hydrogen induced cracking,sulfide stress corrosion performance and salt spray corrosion is good on the base materials, steel pipe weld and heat affected zone of the pipe.

关 键 词：焊管 直缝埋弧焊管 海底管线 X70钢 厚壁 研制 

分 类 号：TE973.1[石油与天然气工程—石油机械设备]