Heat-resistant steel is applicable to the environment

The earliest material used in the boiler and heating furnace is low carbon steel, the temperature used is generally about 200℃, the pressure is only 0.8MPa. Until the boiler steel, such as 20g, the working temperature shall not exceed 450℃ and the working pressure shall not exceed 6MPa. With the continuous increase of the use temperature of various power plants, the working pressure increases rapidly, the use temperature of modern heat resistant steel has been as high as 700℃, the use environment has become more complex and harsh. The use temperature range of heat-resistant steel is 200~1300℃, and the working pressure is a few mpa to dozens of mpa. The working environment has developed from simple oxidation atmosphere to sulfide atmosphere, mixed atmosphere and more complex environment such as molten salt and liquid metal