In oil and gas fields being looked to for future development, gas which includes CO 2 is an increasingly common occurrence. Corrosion has become the major problem for production strings used in environments including CO 2 , and there is a great demand for a tubing that has strong resistance to CO 2 corrosion. JFE Steel's JFE-13CR is a mertensitic stainless steel which combines high performance in such kind of corrosive condition with low cost. For fields with more severe conditions such as high temperature and containing not only CO 2 but small amounts of H 2 S, JFE Steel developed JFE-HP-13CR (HP1 and HP2) material which has higher strength and outstanding anti-corrosion property. It also shows excellent low-temperature toughness.