Abstract
Abstract Results of standard laboratory tests of the corrosion resistance of 18-8 stainless steel indicate the precipitation of minor constituents other than chromium carbide may be significant. Results achieved appear to disagree with those of Bain, Rutherford and Aborn and indicate freedom from intergranular corrosion may be expected only if carbon content is below 0.009 percent, instead of the 0.02 percent they predicted. Tests showed sensitized 18-8 Mo steel containing 0.03 percent maximum carbon content to be corroded in nitric acid at about the same rates as higher carbon 18-8 Mo steels. Metallographic studies using the corroding solution as an etchant indicated that the delta ferrite-austenite grain boundaries were severely attacked with complete loss of some delta ferrite grains. It is postulated that during sensitization some minor constituent forms at grain boundaries of low carbon 18-8 Mo steels and apparently greater at the boundaries separating the delta ferrite from the austenite. The need for an instrument capable of making microchemical analyses is mentioned.
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