An S-590 iron component (Figure 8.33) must have a creep rupture lifetime of at least 20 da...

An S-590 iron component (Figure 8.33) must have a creep rupture lifetime of at least 20 days at 650°C (923 K). Compute the maximum allowable stress level.

Figure 8.33 Logarithm of stress versus the Larson–Miller parameter for an S-590 alloy.

(From F. R. Larson and J. Miller, Trans. ASME, 74, 765, 1952. Reprinted by permission of ASME.)