This paper covers an investigation to determine if the long-term, tensile stress-rupture strength of alloys could be calculated from the results of static tensile-strength tests at elevated temperatures. Twenty-one alloys were investigated. A second-order form of a mechanical-chemical equation of state was used to draw master rupture curves from both long-term rupture and tensile-strength data. It is concluded that the long-term strength of an alloy can be computed from a knowledge of its tensile strength at elevated temperatures, prior history, chemical composition, and mode of failure.

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