1958•OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)Requires access
INFLUENCE OF NICKEL ON INTERGRANULAR CORROSION OF 18% CHROMIUM STEELS
J.R. Upp, F. H. Beck, Marco Fontana
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Abstract
Type 304 (18--8) stainless steel is made susceptible to intergranular corrosion when heated in the temperature range of approximately 1200 to 1400 deg F. This heat treatment impacts resistance to intergranular corrosion for Type 430 (18%Cr) steels. Quenching from 1900 to 2000 deg F piovides optimum resistance to Type 304 but makes Type 430 susceptible to intergranular corrosion. The major compositional difference in these steels is nickel (8% and 0%). Alloys containing intermediate nickel compositions were cast, rolled, heat treated, and tested to determine the influence of this element on corrosion behavior. It was found that the transition occurs at about 2.5 to 3% nickel. Steels with higher nickel should be heat treated like the austenitic steels and those below like the ferritic steels. An unexpected result was the good resistance to intergranular corrosion of all of these alloy; when water quenched from 1400 deg F. (auth)