400Mpa-grade low-temperature maritime work steel plate with good wear resistance and preparation method thereof

The invention discloses a 400 Mpa-grade low-temperature maritime work steel plate with good wear resistance and a manufacturing method thereof, and belongs to the field of steel and iron material preparation. The steel plate comprises the following chemical components in percentage by mass: 0.06%-0.1% of C, 0.7%-1.0% of Si, 0.5%-0.9% of Mn, less than or equal to 0.012% of P, less than or equal to 0.003% of S, 0.3%-0.5% of Cu, 0.4%-0.7% of Ni, 0.55%-0.75% of Cr, 0.015%-0.04% of Nb, 0.02%-0.05% of Al and the balance of Fe and inevitable impurities. The method comprises a smelting process, a continuous casting process, a rolling process and a cooling process. According to the invention, the problems that the traditional 400Mpa-grade steel for the ocean engineering structure is easy to wear and brittle at low temperature in the polar region can be well solved. 本发明公开了一种耐磨性能良好的400Mpa级低温海工钢板及其制造方法，属于钢铁材料制备领域。所述钢板的化学成分质量百分比如下：C:0.06％～0.1％、Si:0.7％～1.0％、Mn:0.5％～0.9％、P:≤0.012％、S:≤0.003％、Cu:0.3％～0.5％、Ni:0.4％～0.7％、Cr:0.55