Establishes the method for deriving lower or proof stress properties and defines the related verification procedure to be used, as an alternative to elevated temperature acceptance testing, whereby a manufacturer may satisfy the customer that the product supplied consistently meets the requirements of the specification. The procedures given whilst minimizing the amount of elevated temperature testing required to be done by the manufacturer, at the same time provide no less assurance to the purchaser than is provided by each batch testing methods. Defines the method for deriving minimum elevated temperature proof stress values.

BS 3920-1(1973) : 1973