The corrosion behaviors of G-X CrNiMoNb 18-10 austenitic stainless steel in (0.1, 1, 2 and 3 M) HCl, H2SO4, and H2SO4 + HCl (1:1) acidic solutions was investigated by the potentiodynamic polarization method and the weight loss method. Furthermore, the corrosion strength of austenitic stainless steel that exposed to acidic solutions for a specific duration of time was determined by hardness measurements. The chrome and other elements (Ni, Mo, etc.) contents of G-X CrNiMoNb 18-10 austenitic stainless steels that exposed for long durations of time in acidic solutions were measured by elemental analysis, while their respective surfaces were analyzed using photographs. (C) 2009 Elsevier B.V. All rights reserved.