本发明一种690MPa级钢板，化学成分及其重量百分含量为：C：0.13～0.17%，Si≤0.50%，Mn：0.70～1.00%，P≤0.010%，S≤0.005%，Ni：0.50～0.60%，Cr：0.90～1.10%，Mo：0.20～0.40%，Nb：0.020～0.035%，Ti：0.010～0.030%，V：0.020～0.045%，B：0.0010～0.0020%，Al：0.020～0.050%，C_eq：0.60～0.66%，其余为Fe和其它不可避免的杂质。本发明钢板内部组织均匀致密，强韧性匹配良好，耐大气腐蚀性能优良。

The invention discloses a 690 MPa-grade steel plate. The 690 MPa-grade steel plate comprises the following chemical components in percentages by weight: 0.13% to 0.17% of C, less than or equal to 0.50% of Si, 0.70% to 1.00% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.50% to 0.60% of Ni, 0.90% to 1.10% of Cr, 0.20% to 0.40% of Mo, 0.020% to 0.035% of Nb, 0.010% to 0.030% of Ti, 0.020% to 0.045% of V, 0.0010% to 0.0020% of B, 0.020% to 0.050% of Al, 0.60% to 0.66% of C_eq and the balance of Fe and other inevitable impurities. The steel plate is uniform and compact in internal structure, good in obdurability matching and excellent in atmospheric corrosion resistance.