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The reason is that pressure vessels are special types of equipment with explosion risks; over the years, the **Boiler and Pressure Vessel Safety Supervision Agency has issued a series of regulations as well as corresponding product standards. In view of the characteristics of pressure vessels, technical requirements for the materials used in such vessels have been specified. When selecting steel for pressure vessels, the following points should be taken into consideration. 01 When selecting materials for pressure vessels, it is necessary to take into account the operating conditions of the vessel, such as temperature, pressure, and the properties of the medium ； The performance characteristics of the material, such as mechanical properties, physical properties, and chemical properties ； Workability, such as the material’s weldability and formability at room temperature and in high temperatures ； Economic viability, such as the cost of materials, manufacturing expenses, and service life. 02 Materials for pressure vessels shall be selected in accordance with the materials listed in the **standard «Pressure Vessels». The standard specifies that the design pressure shall not exceed 35 MPa; for values that exceed this limit, a detailed analysis and testing are required, and a decision shall be made after further investigation. 03 The maximum operating temperature for steel shall not exceed the upper limit temperature corresponding to the allowable stress of each steel grade. However, it should be noted that when carbon steel and carbon-manganese steel are used for extended periods at temperatures above 425°C, the tendency of the carbides in the steel to graphitize must be taken into account. When austenitic steel is used at temperatures above 525°C, its carbon content should not be less than 0.04%. For