A high degree of cold working is involved in forming C18Ni1700 maraging steel into products such as flow formed tubes. After the standard aging treatment of 3.5 h at 480 °C, such heavily deformed material acquires a very high strength level with relatively low value of ductility. Such high strength condition, it is apprehended, is also associated with poor resistance to environment-induced degradation. Efforts were made to modify the aging treatment of cold worked C18Ni1700 to arrive at better strength-ductility combination, while still meeting AMS 6520 requirements, and reduced susceptibility to environment-induced damage. The results were found to be encouraging. In addition to normal tensile testing, slow strain rate testing was carried out to assess the susceptibility of the material to environment-induced degradation after different aging treatments. Distinctly lower ductility values were obtained when tested at lower strain rate, strongly suggesting that the material is prone to hydrogen induced damage. Potentiodynamic testing revealed that increasing the aging temperature resulted in major reduction in corrosion rate. Increasing both aging temperature and time resulted in formation of substantial amount of austenite, having an adverse effect on the corrosion rate. © The Minerals, Metals & Materials Society 2018.