MECHANICAL PROPERTIES AND OXIDATION AND CORROSION RESISTANCE OF REDUCED-CHROMIUM 304 STAINLESS STEEL ALLOYS

摘要

An experimental program was undertaken at the NASA Lewis Research Center to identify effective substitutes for part of the chromium (Cr) in 304 stainless steel as a method of conserving the strategic element Cr. A Cr level of 12 percent was present in most of the experimental alloys evaluated rather than the normal 18 percent contained in 304 stainless steel. Substitutes for Cr in the experimental alloys included aluminum (Al), molybdenum (Mo), silicon (Si), titanium (Ti), and vanadium (V). In addition, nickel (Ni) and manganese (Mn) contents were increased over their normal concentrations in 304 stainless steel in order to achieve an austenitic structure in the reduced Cr alloys.nResults showed that the yield stress of several experimental, austenitic 12 percent Cr alloys compared favorably in magnitude and temperature dependence with the yield stress of 304 stainless steel over the temperature range of -196° to 540° C. The room temper¬ature yield stress of the 20 experimental alloys that were investigated could be correlated with the volume fraction of austenite in the alloys.