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See Chinese contents: GB/T 38719-2020 GB/T 38719-2020: Metallic materials -- Tube -- Determination of biaxial stress-strain curve of tube by hydro-bulging test
This Standard specifies the terms and definitions, symbols and descriptions, test principles, equipment, specimens, test procedures, calculation of biaxial stress-strain curves and test reports of the biaxial stress-strain curve hydro-bulging test for metallic material tubes. This Standard is applicable to thin-walled metal tubes with a circular section (including seamless tubes and welded tubes) whose wall thickness is not less than 0.5 mm and diameter-to-thickness ratio is greater than 20.
