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In a creep test at 640 C, a stainless steel specimen loaded in tension at a stress of 80 MPa failed by creep rupture

In a creep test at 640 C, a stainless steel specimen loaded in tension at a stress of 80 MPa failed by creep rupture after 1000 hours. This same material is loaded in tension, also at 80 MPa, in an engineering application where the temperature is 585 C. Estimate the permissible actual service life in days, if a safety factor of 20 on life is required.

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