Corrosion tests on annealed and sensitized material conducted in the Ferric Sulfate – 50% Sulfuric Acid Test resulted in rates of 0.002 inches per month maximum. Important advantages of Alloy 20 stainless are its excellent mechanical properties and comparative ease of fabrication. The presence of columbium in the alloy minimizes the precipitation of carbides during welding. Assemblies usually have been placed in service in the as-welded condition.