Ti-Zr-Mo composite microalloyed 800MPa-grade high-strength and high-toughness steel plate and preparation method thereof

The invention discloses a Ti-Zr-Mo composite microalloyed 800MPa-grade high-strength and high-toughness steel plate and a preparation method, and belongs to the technical field of high-strength and high-toughness steel plates. The steel plate comprises the following chemical components in percentage by mass: 0.02 to 0.05 weight percent of C, 0.20 to 0.30 weight percent of Si, 1.40 to 1.80 weight percent of Mn, less than or equal to 0.008 weight percent of P, less than or equal to 0.008 weight percent of S, 0.08 to 0.20 weight percent of Ti, 0.05 to 0.15 weight percent of Mo, 0.01 to 0.07 weight percent of Zr and the balance of Fe and inevitable impurities. The steel plate has high strength, high toughness and low yield ratio, and is suitable for the fields of engineering machinery, heavy-load bridges, energy-saving vehicles and the like. 本发明公开一种Ti-Zr-Mo复合微合金化800MPa级高强度高韧性钢板及制备方法，属于高强度高韧性钢板的技术领域。所述钢板的化学成分按质量百分数为：C：0.02-0.05wt.％、Si：0.20-0.30wt.％、Mn：1.40-1.80wt.％、P≤0.008wt.％、S≤0.008wt.％、Ti：0.08-0.20wt.％、Mo：0.05-