Summary of Technical Requirements for Pressure Vessels (25)

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Austenitic stainless steel: The mandatory requirements for austenitic stainless steel containers are as follows: 01 High-alloy austenitic heat-resistant cast steels shall be produced using either vacuum refining or electroslag remelting, with P≤0.035% and S≤0.020%. 02 For high-alloy austenitic heat-resistant steel cast containers, the design pressure shall not exceed 4.0 MPa. 03 For weld joints with a thickness greater than 20 mm, penetrant testing (PT) must be performed on their surfaces. 04 For simple pressure vessels, the actual thickness of the shell after forming shall not be less than 1 mm. 05 PWHT is generally not required. 06 When corrosion protection is required, the surfaces in contact with the medium should be pickled and passivated. 07 Austenitic steels, when used at temperatures above 525°C, have a carbon content of ≥0.04%. 08 For austenitic steel, when the operating temperature is ≥ -196°C, the impact test can be omitted.