【摘要】 为合理选取与设计输氢管线钢管用埋弧焊丝，以L415管线钢为研究对象，选取H08A、MnNi、MnCrNiMo、MnMoTiB、MnNi1TiB、MnNi1Mo共6种埋弧焊丝，配合高氟碱型SJ102焊剂，采用平板对接，通过拉伸试验、低温冲击试验、硬度测试及金相组织观察，研究焊丝成分对焊缝组织与性能的影响。结果表明，所有焊丝焊缝组织均由晶界先共析铁素体与针状铁素体构成，随着焊丝合金元素种类增加与含量提升，焊缝先共析铁素体数量减少、针状铁素体数量增多且细化，焊缝强度、硬度及低温冲击韧性显著提升；即使采用H08A低碳钢焊丝，焊缝强度仍高于母材，但韧性与硬度较低；采用MnCrNiMo、MnMoTiB、MnNi1TiB、MnNi1Mo焊丝的焊缝韧性与硬度进一步提高，其中MnCrNiMo与MnNi1Mo体系能更好平衡焊缝韧性与硬度。因此，输氢管线钢管埋弧焊丝的选用与设计需结合管线钢成分及性能需求，合理确定合金体系与成分含量，研究结果可为低钢级输氢管线钢管焊缝组织与性能控制提供依据。更多还原

【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, MnNi1 TiB, MnNi1 Mo 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, MnNi1 TiB and MnNi1 Mo have high toughness, meanwhile, the hardness of the weld metals also increases. However, the weld wires of MnCrNiMo and MnNi1 Mo 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.更多还原