Data are presented showing the comparative corrosion resistance of several experimental heats and of two commercial heats of AISI 200 series chromium-nickel-manganese steels with the 18-8 chromium-nickel steels (300 series) in a variety of chemical manufacturing processes.
Results of this preliminary comparison have indicated that the chromium-nickel-manganese alloys may be utilized in a number of chemical services where the higher nickel compositions (18-8 steels) are now used. Some environments were encountered in chemical plant processes in which the chromium-nickel-manganese steels in the annealed condition were more corrosion resistant than the 300 series (Types 304 and 316).
In some of the plant processes tested, it was found that in the sensitized condition (1-hour at 1200 F), the susceptibility of the commercial heats of 201 and 202 to intergranular attack was greater than that of the 18-8 chromium-nickel steels. 6.25
