High-temperature alloy refers to a type of metal material based on the third main group elements (iron, cobalt, nickel), with a large amount of strengthening elements added, which can work for a long time at high temperatures above 600 ℃ and under certain stress. High-temperature alloys have high high-temperature strength and good oxidation resistance, thermal corrosion resistance, and fatigue resistance. They have good structural stability and reliability at high temperatures, and therefore they are also known as heat strong alloys, heat-resistant alloys, or superalloys.