Using new data analysis procedures, 100 000 h creep strengths are estimated by extrapolation of stress rupture values with creep lives <5000 h for Grade 22 tube as well as for annealed/tempered and quenched/tempered plates. In addition to allowing accurate prediction of long term strengths, the resulting property sets can be discussed sensibly in terms of the deformation and damage processes controlling creep and creep fracture.
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