本发明提供了一种耐CO₂腐蚀钢管及其制备方法，涉及CO₂驱油技术中油气集输过程用管线制造技术领域，所述耐CO₂腐蚀用钢板以质量百分比计有C0.03～0.07％，Cr 6.0～8.0％，Ni 0.15～0.50％，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，对钢锭进行锻造；S2、钢坯加热，进行粗轧轧制；S3、板坯精整和加热，进行精轧轧制；S4、进行轧后调质处理；S5、焊接成管。制备的钢管具有优异的耐CO₂腐蚀性能、综合力学性能，其腐蚀速率低于0.06mm/a，且造价较低，在CO₂驱油技术油气集输过程中具有广阔的应用前景。

The invention provides a CO₂ corrosion-resistant steel pipe and a preparation method thereof, and relates to the technical field of pipeline manufacturing in the oil and gas gathering and transportation process in CO₂ flooding technology. The CO₂ corrosion-resistant steel plate has a C 0.03 to 0.07% in terms of mass percentage, Cr 6.0～8.0%, Ni 0.15～0.50%, Nb 0.01～0.06%, P≤0.005%, S≤0.005%, the rest is Fe and inevitable impurities; the preparation method is: S1, according to the established element mass percentage Smelting and casting to form, forging the steel ingot; S2, heating the billet, and performing rough rolling; S3, slab finishing and heating, and performing finishing rolling; S4, performing post-rolling quenching and tempering treatment; S5, welding into a tube . The prepared steel pipe has excellent CO₂ corrosion resistance, comprehensive mechanical properties, and its corrosion rate is lower than 0.06mm/a, and the cost is low. It has broad application prospects in the CO₂ flooding technology oil and gas gathering and transportation process.