The mechanical behavior and corrosion resistance of a cold-worked High Nitrogen Stainless Steel, developed by the National Institute of Standards and Technology, were investigated.  Its mechanical properties, including YS, UTS and fracture toughness, and fatigue behavior were determined in ambient air.  It was also subjected to stress corrosion cracking and corrosion fatigue tests in 3.5% NaCl solution.  The results were compared with those of the other high strangth steels, AerMet 100 and 300M.