Heat resistant steel an alloy steel with high strength and good chemical stability at high temperature. It includes anti - oxidation steel (or high - temperature non - peeling steel) and hot - strength steel. Oxidation resistant steel generally requires better chemical stability, but the load is lower. Hot strength steel requires high temperature strength and corresponding oxidation resistance. Heat-resistant steel is often used in the manufacture of boilers, steam turbines, power machinery, industrial furnaces and aerospace, petrochemical and other industrial sectors in the work under high temperature components. In addition to high temperature strength and resistance to high temperature oxidation corrosion, these components are required to have enough toughness, good machinability and weldability, as well as certain organizational stability according to different USES. In addition, some new low chromium nickel oxidation resistant steels have been developed.