大直径超厚Φ1422 mm×25.4 mm螺旋埋弧焊管开发  

Development of X80 Φ1422 mm×25.4 mm Large Diameter Ultra Thick Wall SAWH Pipe

作　　者：黄晓辉 毕宗岳[1,2] 张超 赵红波[1,2] 牛辉 韦奉[1,2] 牛爱军 HUANG Xiaohui;BI Zongyue;ZHANG Chao;ZHAO Hongbo;NIU Hui;WEI Feng;NIU Aijun(Chinese National Engineering Research Center for Petroleum and Natural Gas Tubular Goods Co.,Ltd.,Baoji 710008,Shaanxi,China;Baoji Petroleum Steel Pipe Co.,Ltd.,Baoji 721008,Shaanxi,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

出　　处：《焊管》2022年第1期26-31,共6页Welded Pipe and Tube

基　　金：国家重点研发计划“低温高压服役条件下高强度管线用钢”(项目编号2017YFB0304903);中国管线研究组织项目“X80级管线钢制管后强度变化规律研究”(项目编号CPRO2018NO3)。

摘　　要：通过低碳高Nb+Mo/Ni合金设计理念,采用粗轧低温快轧技术,成功开发出典型的针状铁素体型X80级Φ1422 mm×25.4 mm大直径超厚螺旋缝埋弧焊管用热轧卷板。在制管过程中采用低残余应力成型技术,结合适度增加水压压力,管体内表面和外表面环向应力都低于80 MPa,并通过试验确定了厚壁管材焊接过程中的最佳热输入线能量。对试制后的X80级Φ1422 mm×25.4 mm螺旋埋弧焊管进行理化性能检测,结果显示,管体屈服强度为556~615 MPa,抗拉强度为648~655 MPa,焊接接头拉伸强度≥669 MPa,0℃下,母材、HAZ和焊缝夏比冲击性能都在150 J以上,母材DWTT剪切面积94%,且管体和焊接接头硬度最大值仅255HV;。检测结果表明,试制的X80级Φ1422 mm×25.4 mm管材具有良好的力学性能,且理化性能全部符合API SPEC 5L标准要求。Through the design concept of low-carbon high Nb+Mo/Ni alloy and the technology of rough rolling,low temperature fast rolling,the typical acicular ferrite hot rolled coil used for X80Φ1 422 mm×25.4 mm large diameter ultra-wall thickness submerged-arc welded helical pipe has been successfully developed.In the process of pipe manufacturing,the low residual stress forming technology is adopted,combined with the increase of water pressure,the circumferential stress on the inner surface and outer surface of the pipe is less than 80 MPa,and the best heat input line energy in the welding of thick wall pipe is determined through experiments.Physical and chemical properties of X80Φ1 422 mm×25.4 mm submerged-arc welded helical pipe were tested after trial production.The results show that the yield strength of the pipe is 556~615 MPa,the tensile strength is 648~655 MPa,and the tensile strength of the welded joint is≥669 MPa.At 0℃,the Charpy impact properties of base metal,HAZ and weld are above 150 J,the shear area of base metal DWTT is 94%,and the maximum hardness of pipe and welded joint is only 255HV;.It can be seen that the trial production of X80Φ1 422 mm×25.4 mm pipe shows good mechanical properties,and all physical and chemical properties meet the requirements of API SPEC 5L standard.

关 键 词：大直径 超厚壁 螺旋埋弧焊管 力学性能 

分 类 号：TG445[金属学及工艺—焊接]