International Organization for Standardization (ISO)
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ISO 6303:1981
Scope
Defines a procedure for obtaining and for assessing the data necessary to establish long-time stress rupture values for steels for pressure purposes for steels where properties different from those internationally agreed are being claimed. The purpose of a standard procedure is to minimize any differences in long-time estimates obtained in different countries due to differences in the quantity and duration of the data used and differences in the method of analysing the data.
ISO 6303:1981 history
1981ISO 6303:1981 Pressure vessel steels not included in ISO 2604, Parts 1 to 6; Derivation of long-time stress rupture properties