本发明公开了一种适用于低温X80厚壁管线钢埋弧焊接用焊丝，焊丝的化学成分按重量百分比为：0.05≤C≤0.10；0.5≤Mn≤1.3；0.10≤Si≤0.30；P≤0.008；S≤0.005；0.10≤Cr≤0.30；0.20≤Mo≤0.30；0.07≤Nb≤0.20；2.0≤Ni≤3.0；0.008≤B≤0.01；0.06≤Ti≤0.15；0.003≤Re≤0.01；其余为Fe。本发明焊丝配合相应的焊剂( SJ101氟碱型焊剂 )对低温服役环境用X80钢级管线钢进行焊接后，-45℃的冲击韧性值可达到100J以上，且焊缝外观形貌满足标准要求。

The invention discloses a welding wire suitable for submerged arc welding of low-temperature X80 thick-walled pipeline steel. The chemical composition of the welding wire is as follows by weight percentage: 0.05≤C≤0.10; 0.5≤Mn≤1.3; 0.10≤Si≤0.30; P≤0.008 ; S≤0.005; 0.10≤Cr≤0.30; 0.20≤Mo≤0.30; 0.07≤Nb≤0.20; 2.0≤Ni≤3.0; 0.008≤B≤0.01; 0.06≤Ti≤0.15; 0.003≤Re≤0.01; the rest is Fe . After the welding wire of the present invention is matched with a corresponding flux (SJ101 fluorine-alkali flux) to weld X80 steel grade pipeline steel in a low-temperature service environment, the impact toughness value at -45°C can reach more than 100J, and the appearance of the weld meets the standard requirements.