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The data reported in the literature, upon austenite stability, carbide precipitation, weldability, and corrosion resistance of low-carbon 18-8, are reviewed. Not only carbon but nitrogen as well must be impractically low to make 18-8 absolutely resistant to precipitation and grain boundary corrosion under any and all conditions of sensitization and corrosion.
This absolutely resistant condition is not required under most conditions of service. Commercially obtainable low-carbon and moderate nitrogen contents appear adequate to avoid sensitization upon cooling from welding under usual conditions, but evidence on this score is chiefly indirect.
Artificial, conventional methods for evaluating sensitization and corrosion-resistance are incompetent to appraise truly the material for a given actual service. Specifications calling for such tests may discard perfectly satisfactory material.
Gillett, H W
Chief Technical Adviser, Battelle Memorial Institute, Columbus, Ohio