2023年第1期X80级大口径直缝埋弧焊管的开发李中平1，昌发祥2，代志健2，肖甜2，陈礼貌3，罗天宝2，谢平2（1.湘潭钢铁集团有限公司，湖南湘潭411101；2.湖南胜利湘钢钢管有限公司，湖南湘潭411101；3.中国船级社武汉分社，湖北武汉430000）摘要：采用超低碳、Nb+Ti+Mo+Ni微合金化、配合适当的控轧控冷工艺，成功开发了板厚32.1mm、宽度4343mmX80M钢板，钢板具有高强度、良好的低温韧性及优良的可焊性；钢板按照JCOE工艺制管，采用合理的坡口尺寸、焊接工艺参数、扩径率等，保证管体几何尺寸、焊缝、焊缝余高、错边、内外焊道中心线偏移量及头部内外焊道熔合量符合《天然气输送管道用OD1422mmX80直缝埋弧焊管技术条件》的要求，管体屈服强度605~630MPa，抗拉强度680~720MPa，屈强比0.88~0.92；在-20度冲击试验下，焊缝冲击吸收能量150~200J、热影响区冲击吸收能量250~300J。关键词：大口径；X80；埋弧焊管中图分类号：TG142文献标识码：A文章编号：2095-5014（2023）01-0015-05DevelopmentofGradeX80LargeDiameterLongitudinalSubmergedArcWeldedPipeLIZhongping1，CHANGFaxiang2，DAIZhijian2，XIAOTian2，CHENLimao3，LUOTianbao2，XIEPing2（1.HunanXiangtanIronandSteelGroupCo.，Ltd.，Xiangtan411101，China；2.HunanShengliXianggangSteelPipeCo.，Ltd.，Xiangtan411101，China；3.WuhanBranchofChinaClassificationSociety，Wuhan430000，China）ABSTRACT：X80Msteelplatewithwallthicknessof32.1×4343mmhasbeensuccessfullydevelopedbyusingultra-lowcarbon，Nb+Ti+Mo+Nimicroalloyingandpropercontrolledrollingandcontrolledcoolingprocess.Thesteelplatehashighstrength，goodlowtemperaturetoughnessandexcellentweldability；ThesteelplateismanufacturedaccordingtotheJCOEpipemanufacturingprocess，andthereasonablydesignedgroovesize，weldingprocessparameters，diameterexpansionrate，pipebody，weld，weldreinforcement，misalignment，offsetofinnerandouterweldbeadcenterlineandfusionamountofheadinnerandouterweldbeadallmeettherequirementsofOD1422mmX80LSAWpipefornaturalgastransmissionpipeline.Theyieldstrengthofthepipebodyis605~630MPa，thetensilestrengthis680~720MPa，theyieldratiois0.88~0.92，theimpactofweldingseamis150~200J，andtheimpactofheataffectedzoneis250~300J.KEYWORDS：largediameter；X8...
