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Adaptation environment of heat-resistant steel castings


Heat-resistant steel castings refer to steels that work at high temperatures. The development of heat-resistant steel castings is closely related to the technological progress of various industrial sectors such as power plants, boilers, gas turbines, internal combustion engines, and aero engines. Due to the different temperatures and stresses experienced by various machines and devices, as well as different environments, the types of steel used are also different.
The material used in boilers and heating furnaces earlier is low carbon steel, the temperature used is generally around 200 ℃, and the pressure is only 0.8MPa. Until the low carbon steel used for boilers is used, such as 20g, the use temperature does not exceed 450 ℃, and the working pressure does not exceed 6MPa. With the continuous increase of the operating temperature of various power devices and the rapid increase of the working pressure, the operating temperature of modern heat-resistant steel has reached 700 ℃, and the operating environment has become more complex and harsh. The temperature range of heat-resistant steel is 200~1300℃, and the working pressure is several MPa to several tens of MPa. The working environment has developed from a simple oxidizing atmosphere to a vulcanizing atmosphere, a mixed atmosphere, and a more complex atmosphere such as molten salt and liquid metal. surroundings.

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