A 1035 steel has a tensile strength of 70 kpsi and is to be used for a part that sees 450°F in service. Estimate the Marin temperature modification factor and (Se)450◦ if
(a) The room-temperature endurance limit by test is (S′e)70◦ = 39.0 kpsi.
(b) Only the tensile strength at room temperature is known.