The issue of stress selection for steel pipes
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The allowable stresses of steel pipes at different temperatures specified in the appendix of GB/T20801.2-2020 differ from those specified in the appendix of GB50316-2000, the 2008 edition of the \"Code for Design of Industrial Metal Piping\". Which standard do you people use in your design work? For example, for both being 20 steel, at 20 degrees, the former has a value of 137 MPa while the latter has a value of 130 MPa.
Both standards can be used; the advantage of GB20801 is that no temperature correction factor needs to be considered below 200 degrees (for calculating the hydraulic test pressure)
Many standards are contradictory or inconsistent with each other; the approach is to first negotiate with the client regarding which set of standards to use, and then proceed in accordance with the selected standards.