Abstract Tests were made in various corrosive environments to compare the corrosion resistance of open hearth steel with basic oxygen steel. Media in which the 40-day tests were run include sodium hydroxide plus sodium chloride, sodium chloride alone, steam, steam condensate, city water, potassium hydroxide, chlorine, perchloric acid and sulfuric acid. Results did not indicate any substantial differences in corrosion resistance of the two steels although basic oxygen steel may have a slight advantage for perchloric acid and chlorine exposure. 6.2.3