本发明公开了一种大厚度易焊接高强韧性齿条钢板及其生产方法，其成分的重量百分含量为：C 0.09%～0.11%，Si 0.15%～0.35%，Mn 1.00%～1.10%，P≤0.008%，S≤0.003%，Ni 3.0%～3.2%，Cr 0.80%～0.86%，Mo 0.63%～0.68%，Nb 0.02%～0.03%，V 0.04%～0.05%，Cu 0.20%～0.25%，Al 0.05%～0.07%，B 0.0008%～0.0018%；余量为Fe和微量不可避免的杂质。本钢板的化学成分设计采用低镍设计，降低了成本,且加入了Cu，增加了钢板的耐腐蚀性。本钢板中碳及贵重合金含量较低，具有低碳当量，低裂纹敏感型指数；焊接后高强韧性级别：屈服强度在690MPa以上，抗拉强度在790MPa～895MPa之间；无塑性转变温度NDT为90℃；硬度HB≥260；钢板最大厚度可达到210mm。

The invention discloses a large-thickness easy-to-weld high-tenacity rack steel plate and a production method thereof. The components of the large-thickness easy-to-weld high-tenacity rack steel plateinclude, by weight percentage, 0.09-0.11% of C, 0.15-0.35% of Si, 1.00-1.10% of Mn, less than or equal to 0.008% of P, less than or equal to 0.003% of S, 3.0-3.2% of Ni, 0.80-0.86% of Cr, 0.63-0.68%of Mo, 0.02-0.03% of Nb, 0.04-0.05% of V, 0.20-0.25% of Cu, 0.05-0.07% of Al, 0.0008-0.0018% of B, and the balance Fe and unavoidable impurities. The chemical composition design of the steel plate adopts a low-nickel design, the cost is lowered, and Cu is added, so that the corrosion resistance of the steel plate is increased. The content of carbon and precious alloys of the steel plate is low, and the steel plate has a low carbon equivalent and a low crack sensitive index. The steel plate achieves a high tenacity level after welding, the yield strength is 690 MPa or above, the tensile strength is 790-895 MPa, the nil-ductility transition temperature (NDT) is -90 DEG C, the hardness HB is larger than or equal to 260, and the maximum thickness of the steel plate reaches 210 mm.