For a cylindrical S-590 alloy specimen (Figure 8.31) originally 14.5 mm (0.57 in.) in diameter and 400 mm (15.7 in.) long, what tensile load is necessary to produce a total elongation of 52.7 mm (2.07 in.) after 1150 h at 650°C (1200°F)? Assume that the sum of instantaneous and primary creep elongations is 4.3 mm (0.17 in.).