360MPa-grade LCO2 marine steel plate and preparation method thereof

The invention discloses a 360MPa grade LCO2 marine steel plate and a preparation method thereof, and relates to the technical field of metallurgy, the 360MPa grade LCO2 marine steel plate comprises the following chemical components by mass percentage: 0.04%-0.08% of C, 0.10%-0.30% of Si, 1.40%-1.60% of Mn, less than or equal to 0.008% of P, less than or equal to 0.002% of S, 0.015%-0.060% of Als, less than or equal to 40ppm of N, 0.005%-0.030% of Nb, less than or equal to 0.30% of Ni, and the balance Fe and inevitable impurities. Low-temperature heating, large-compression-ratio low-temperature rolling and ultra-fast cooling processes are adopted, it is guaranteed that the steel plate obtains an ultra-refined quasi-polygonal ferritic structure, and the steel plate has good low-temperature impact toughness and high strength. 本发明公开了一种360MPa级LCO2船用钢板及其制备方法，涉及冶金技术领域，其化学成分及质量百分比如下：C：0.04%～0.08%，Si：0.10%～0.30%，Mn：1.40%～1.60%，P≤0.008%，S≤0.002%，Als：0.015%～0.060%，N≤40ppm，Nb：0.005%～0.030%，Ni≤0.30%，余量为Fe和不可避免的杂质。本发明采用低温加