焊管2025，Vol.48Issue(11)：79-86,8.DOI:10.19291/j.cnki.1001-3938.2025.11.010
焊丝成分对L415管线钢焊缝组织和性能的影响
Effect of Chemical Composition of Welding Wires on Microstructure and Mechanical Properties of Weld Metal of L415 Pipeline Steel
摘要
Abstract
In order to select and design submerged arc welding wires for hydrogen pipeline steel pipes in a reasonable manner,L415 pipeline steel was selected as the research object.H08A,MnNi,MnCrNiMo,MnMoTiB,MnNi1TiB,MnNi1Mo six types of submerged arc welding wires were selected,combined with high fluorine alkali SJ102 flux,and flat plate docking was used.The influence of welding wire composition on the microstructure and properties of the weld was studied through tensile testing,low-temperature impact testing,hardness testing,and metallographic observation.Results show that the microstructure of weld metal of all welding wires is composed of grain boundary ferrite and acicular ferrite.With the increase of the content of alloy elements in the welding wire,the amount of grain boundary ferrite in microstructure of weld metal decreases,and the amount of acicular ferrite increases,therefore,the strength,hardness and low temperature impact toughness of weld metal increase.However,even with the welding wire of H08A steel,the strength of weld metal is higher than the base metal,therefore,in order to select and design the welding wire for hydrogen transport pipeline steel reasonably,the balance of weld hardness and toughness should be focused on firstly.In the experiment,the weld metals welded by welding wires of MnCrNiMo,MnMoTiB,MnNi1TiB and MnNi1Mo have high toughness,meanwhile,the hardness of the weld metals also increases.However,the weld wires of MnCrNiMo and MnNi1Mo can better balance the hardness and toughness of the weld metal.Therefore,the selection and design of submerged arc welding wire for hydrogen pipeline steel pipes should be based on the composition and performance requirements of the pipeline steel,and the alloy system and composition content should be reasonably determined.This study can provide a basis for controlling the microstructure and performance of welds in low-grade hydrogen pipeline steel pipes.关键词
L415管线钢/焊丝成分/焊缝组织/多丝埋弧焊Key words
L415 pipeline steel/electrode composition/weld microstructure/multi-wire submerged arc welding分类
金属材料引用本文复制引用
陈小伟,臧首婴,沙济通,赵阔,王斌,刘迪,白日新,肖福仁..焊丝成分对L415管线钢焊缝组织和性能的影响[J].焊管,2025,48(11):79-86,8.基金项目
河北省省重点研发项目"纯氢长输管道关键技术研究与应用示范"(项目编号22314601D). （项目编号22314601D）
