650MPa-level multi-wire submerged arc welding wire rod and welding wire suitable for high heat input welding

The invention discloses a 650MPa-level multi-wire submerged-arc welding wire rod suitable for high heat input welding, which belongs to the technical field of welding materials and comprises the following chemical components in percentage by mass: 0.04 to 0.10 percent of C, less than or equal to 0.09 percent of Si, 2.3 to 2.55 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.005 percent of S, 0.10 to 0.25 percent of Cr, 0.75 to 1.05 percent of Ni, 0.4 to 0.58 percent of Mo, 0.11 to 0.24 percent of Ti, 0.0015 to 0.030 percent of Ca, less than or equal to 0.030 percent of Re and the balance of Fe and inevitable impurities. The invention further discloses a welding wire based on the wire rod. According to the welding wire, chemical components are reasonably designed, and deposited metal obtained under 50-100 kJ/cm heat input has excellent comprehensive performance and high tensile strength and low-temperature impact toughness. 本发明公开了一种适用于大热输入焊接的650MPa级多丝埋弧焊盘条，属于焊接材料技术领域，其化学成分以质量百分