本发明公开了一种海洋工程用高强高韧性钢板，该钢板的各化学成分质量百分含量如下，C:0.09%～0.12%，Si:≤0.10%，Mn:0.80%~1.0%，P:≤0.010%，S:≤0.003%，Ni:1.5%~2.5%，Cr:0.50%~0.70%，Mo:0.50%~0.60%，Cu:0.20%~0.30%，V:0.040%～0.050%，Nb:0.01%0.02%，Ti:0.01%0.02%，Al全铝:0.02%～0.04%，B:0.001%~0.002%。本发明采用转炉冶炼，精炼，抽真空，连铸，轧制，辊底式淬火机，辊底式回火炉调质处理工艺,制成高强度,高韧性的钢板。

The invention discloses a high-strength high-toughness steel plate for ocean engineering. The steel plate is prepared from the following chemical components in percentage by mass: 0.09%-0.12% of C, less than or equal to 0.10% of Si, 0.80%-1.0% of Mn, less than or equal to 0.010% of P, less than or equal to 0.003% of S, 1.5%-2.5% of Ni, 0.50%-0.70% of Cr, 0.50%-0.60% of Mo, 0.20%-0.30% of Cu, 0.040%-0.050% of V, 0.01%-0.02% of Nb, 0.01%-0.02% of Ti, 0.02%-0.04% of TAl aluminum, 0.001%-0.002% of B. The high-strength high-toughness steel plate is manufactured by adopting processes of converter smelting, refining, vacuum-pumping, continuous casting, rolling, and quenching and tempering of a roller-bottom type quenching machine and a roller-bottom type tempering furnace.