Abstract: Corrosion behaviors of three kinds of pipe-line steels at 30℃,60℃ and 90℃ were studied through quenching test in NACE solution(5%NaCl +0.5% CH₃COOH) saturated with CO₂.The result showed that the corrosion rate of all samples at 90℃was one order higher than that at 30℃ and 60℃.There was no evident pittings on coupon surface at 30℃,but many pittings on the coupon surface at 60℃ and at 90℃,there appeared not only severe mesa attack but also corrosion dents,and the corrosion was severe.The carbon dioxide corrosion of the steels was affected by the metallurgy factors such as composition,microstructure and so on.