Abstract: On the basis of Baosteel 3Cr series economical oil pipe steels which are used to resist H₂S and（or）CO₂ corrosion and according to the effect of Cr content on low alloy steels’mechanical properties, economical 110kpsi（758MPa）grade oil tubing BG110S-2Cr, which has good H₂S+CO₂ corrosion-resistant performance, has been developed successfully. The results showed that the mass produced tubing owned excellent ability of hydrogen sulphide stress corrosion（SSC）resistance. Furthermore, In simulated media of typical oil field, CO₂ corrosion velocity of BG110S-2Cr was less than half that of common P110 tubing and casing.