Production method of EH460 grade 150-200mm extra-thick steel plate

The invention discloses a production method of an EH460-grade 150-200 mm extra-thick steel plate, and relates to the technical field of ocean engineering steel. The EH460-grade 150-200 mm extra-thicksteel plate comprises the following chemical components of, by mass, 0.08%-0.11% of C, 0.20%-0.50% of Si, 1.15%-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.030%-0.080% of Nb, 0.001%-0.050% of V, 0.01%-0.05% of Al, 0.005%-0.020% of Ti, 0.00%-0.08% of Mo, 0.15%-0.35% of Cr, 0.10%-0.50% of Cu, 0.01%-0.80% of Ni, the sum of Cr, Ni, Mo and Cu is less than or equal to 1.30%, and the balance is Fe and inevitable impurities. 本发明公开了一种EH460级150-200mm特厚钢板的生产方法，涉及海洋工程用钢技术领域，其化学成分及质量百分比如下：C：0.08%～0.11%，Si：0.20%～0.50%，Mn：1.15%～1.60%，P≤0.015%，S≤0.005%，Nb：0.030%～0.080%，V：0.001%～0.050%，Al：0.01%～0.05%，Ti：0.005%～0.020%，Mo：0.00%～0.08%，Cr：0.15%～0.35%，Cu：0.10%～0.50%，Ni：0.01%～0.80%，Cr+Ni+Mo+Cu≤1.30%，余量为Fe和不可避免的杂质。