本发明提供了一种耐CO₂腐蚀用钢板及其制备方法，涉及CO₂驱油技术中油气集输、储存等过程用钢板、容器及管线制造技术领域，所述耐CO₂腐蚀用钢板以质量百分比计有C 0.03～0.07％，Cr 4.0～6.0％，Ni 0.15～2.50％，Nb 0.01～0.06％，P≤0.005％，S≤0.005％，其余为Fe及不可避免的杂质；制备方法为：S1、按既定的元素质量百分比进行冶炼并浇铸成型；S2、对钢锭进行锻造；S3、钢坯加热，进行粗轧轧制；S4、板坯精整和加热，进行精轧轧制；S5、进行轧后调质处理。制备的钢板具有优异的耐CO₂腐蚀性能，其腐蚀速率低于0.21mm/a，且造价较低，在CO₂捕获、利用与封存(CCUS)系统中具有广阔的应用前景。

The invention provides a CO₂ corrosion-resistant steel plate and a preparation method thereof, and relates to the technical field of steel plates, containers and pipelines used in the process of oil and gas gathering and transportation, storage, etc. in CO₂ flooding technology. The CO₂ corrosion-resistant steel plate is calculated by mass percentage There are C 0.03～0.07%, Cr 4.0～6.0%, Ni 0.15～2.50%, Nb 0.01～0.06%, P≤0.005%, S≤0.005%, the rest is Fe and inevitable impurities; the preparation method is: S1 Smelting and casting according to the established element mass percentage; S2, forging the steel ingot; S3, heating the billet, and performing rough rolling; S4, slab finishing and heating, and finishing rolling; S5, after rolling Quenched and tempered. The prepared steel plate has excellent CO₂ corrosion resistance, its corrosion rate is lower than 0.21mm/a, and the cost is low, and it has broad application prospects in the CO₂ capture, utilization and storage (CCUS) system.