Heat-resistant steel castings refer to steel that works at high temperatures. Because this material has the functions of heat resistance, corrosion resistance, and oxidation resistance, it is called heat-resistant steel castings. The development of heat-resistant steel castings is closely related to the technological progress of various industrial sectors such as power stations, boilers, gas turbines, internal combustion engines, and aero engines. Due to the different temperatures and stresses used by various types of machines and devices, as well as the different environments, the types of steel used are also different.
1. Overview of heat-resistant steel castings
Heat-resistant steel castings refer to steel that works at high temperatures. Because this material has the functions of heat resistance, corrosion resistance, and oxidation resistance, it is called heat-resistant steel castings. The development of heat-resistant steel castings is closely related to the technological progress of various industrial sectors such as power stations, boilers, gas turbines, internal combustion engines, and aero engines. Due to the different temperatures and stresses used by various types of machines and devices, as well as the different environments, the types of steel used are also different. The production of heat-resistant steel castings using lost-form casting, its low cost, smooth surface, won the majority of customers love.
2. Applicable environment
As early as the material used in boilers and heating furnaces is low carbon steel, the temperature used is generally about 200 ℃, and the pressure is only 0.8MPa. Until now, the low carbon steel used for boilers, such as 20g, has a working temperature of not more than 450 ℃ and a working pressure of not more than 6MPa. With the continuous improvement of the use temperature of various power devices and the rapid increase of working pressure, the use temperature of modern heat-resistant steel has reached 700 ℃, and the use environment has become more complex and demanding. At present, the use temperature range of heat-resistant steel is 200~1300 ℃, and the working pressure is several MPa to tens of MPa. The working environment has developed from a simple oxidizing atmosphere to a vulcanization atmosphere, a mixed atmosphere, and molten salt and liquid metal. Complex environment.
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