<p>Super 304HCu is an austenitic stainless steel used in advanced ultra-supercritical power plants for its excellent high-temperature operational capabilities. One of the major concerns is that it has to provide adequate resistance to hot corrosion for prolonged exposure to environments containing molten salts. The samples of Super 304HCu steel with dimensions (15*3.5*3.5) mm are polished, coated with a salt mixture of Na₂SO₄-60% V₂O₅ and then placed in a muffle furnace at a temperature of 900&#xa0;°C for 1 hour per cycle. The samples gained weight with an increase in time of exposure, and the oxidation exponent (<i>n</i>) value of the power law is found to be 0.8 suggesting the rate-controlling mechanism of hot corrosion is mixed. From x-ray diffraction analysis, copper, the typical alloying element in the Super 304HCu steel, tends to form spinel oxides (CuFe₂O₄) in between the layers of the oxide scale.</p>