Low-resilience corrosion-resistant 550MPa-grade cold-rolled high-strength steel and manufacturing method thereof

The invention relates to low-resilience corrosion-resistant 550MPa-grade cold-rolled high-strength steel and a manufacturing method thereof. The steel plate comprises the following chemical components in percentage by weight: 0.05%-0.075% of C, 0.25%-0.3% of Si, 1.41%-1.65% of Mn, 0.053%-0.077% of Cr, less than or equal to 0.010% of P, less than or equal to 0.010% of S, 0.6%-2.8% of Al, 0.02%-0.05% of Ce and the balance of Fe and inevitable impurities. The chemical component design is based on C, Si and Mn elements, the strength of the steel is improved by adding a certain amount of Al and Cr, and meanwhile the corrosion resistance of the steel is improved; by adding a certain amount of Ce, the effects of purifying the grain boundary and desulfurizing are achieved; and the material with the low yield ratio is obtained by controlling the structure in the annealing process. 本发明涉及一种低回弹耐腐蚀550MPa级冷轧高强钢及其制造方法，钢板的化学成分以重量百分比计为C：0.05％～0.075％，Si：0.25％～0.3％，Mn：1.41％～1.65％，Cr：0.053％～0.077％，P≤0.010％，S≤0.010％，Al：0.6％～2.8％，