本发明公开了一种高韧性大线能量焊接用钢及其生产方法，其化学成分组成及质量百分含量为：C：0.05～0.09%，Si：0.10～0.20%，Mn：1.45～1.55%，P≤0.015%，S≤0.008%，Nb：0.008～0.018%，Ti：0.010～0.020%，N：0.0040～0.0060%，余量为Fe和不可避免杂质；生产方法包括LF精炼、RH精炼、连铸、加热、轧制、冷却工序。本发明可使钢板在TMCP状态下满足高韧性和高焊接性能的要求，操作工艺简便；钢板的大线能量焊接HAZ低温韧性优异，钢板在焊接线能量为200kJ/cm时，HAZ在‑40℃条件下的平均冲击功高达200J以上。

The invention discloses high toughness and high input energy welding steel and a production method of the high toughness and high input energy welding steel. Chemical components of the high toughnessand high input energy welding steel comprise, by mass percentage, 0.05-0.09% of C, 0.10-0.20% of Si, 1.45-1.55% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.008% of S, 0.008-0.018% of Nb, 0.010-0.020% of Ti, 0.0040-0.0060% of N and the balance Fe and inevitable impurities. The production method includes the procedures of LF refining, RH refining, continuous casting, heating, rolling and cooling. By means of the high toughness and high input energy welding steel, a steel plate can meet the high toughness and high welding performance requirements under a TMCP state, and the operation process is simple and convenient; and the low temperature toughness of high input energy welding HAZ of the steel plate is excellent, and the average impacting power of the HAZ of thesteel plate under the -40 DEG C condition reaches up to 200 J or above when the weld heat input is 200 kJ/cm.