2520(310S), austenitic chrome-nickel stainless steel, has good oxidation resistance, corrosion resistance, high-temperature creep strength. Continue to work withgood temperature resistance. Dedicated to the manufacture of high-temperature electric furnace steel pipe and so on, because of its solid solution strengthening effect, the strength was increased, the chemical composition of steel properties are chromium, nickel-based add molybdenum, tungsten, niobium and titanium and other elements, formed a face-centered cubic structure. This made the steel to be with high strength and creep strength under high temperature