Steel plate with high cracking resistance for ocean structure and production method of steel plate

The invention discloses a steel plate with high cracking resistance for an ocean structure and a production method of the steel plate. The steel plate is a quenched and tempered steel plate, and the steel plate comprises the following chemical components in percentage by mass: 0.06-0.10% of C, 0.20-0.40% of Si, 1.40-1.50% of Mn, less than or equal to 0.008% of P, less than or equal to 0.003% of S, 0.50-0.90% of Ni, Cr, Mo and Nb, and the balance of Fe and inevitable impurities. The production method comprises the step of controlling a smelting process, a rolling process and a heat treatment process. The steel plate for an ocean structure has high anti-cracking performance, the CTOD value is larger than or equal to 0.46, the brittle fracture resistance and the fatigue damage resistance of the steel plate are greatly improved, and the production process is simple. 本发明公开了一种高耐抗开裂性能海洋结构用钢板及其生产方法，所述钢板为淬火加回火型钢板，其化学成分及其质量百分含量为：C：0.06-0.10%，Si：0.20-0.40%，Mn：1.40-1.50%，P≤0.008%，S≤0.003%，及Ni、Cr、Mo、Nb，Ni+Cr+Mo+Nb：0.50-0.