It is an Alloy steel with high strength and good chemical stability at high temperatures. It includes oxidation resistant stee and thermal strength steel two categories.
Oxidation resistant steel generally requires better chemical stability, but bears lower loads. Thermal strength steel requires higher high temperature strength and corresponding oxidation resistance.
Heat resistant steel is commonly used in the manufacture of boilers, steam turbines, power machinery, industrial furnaces and aviation, petrochemical and other industrial sectors in the high-temperature operation of parts. These components in addition to high temperature strength and resistance to high temperature oxidation corrosion, according to the use of different requirements also require enough toughness, good machinability and weldability, as well as a certain organizational stability.
