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A modified Monkman-Grant equation, which can provide a more accurate means of predicting creep rupture life than the standard Monkman-Grant formula, has been investigated for Gr.92 using creep data in the NIMS Creep Data Sheets at 550 to 750°C. The  tr  versus minimum creep ratemin  plot, which is called the Monkman-Grant relation, deviates downward at low stresses and long times. Better correlation of the  tr  with themin  is obtained by the replacement of  tr  with ( tr  / εr ), where  εr  is the total or rupture strain. The ( tr  / εr ) is inversely proportional to themin  over a wide range of stress, temperature and test duration, and the magnitude of data scattering is only a little bit even at low stresses and long times. The creep life of Gr.92 can be predicted by evaluating themin , together with the  εr  evaluated from the stress and ormin  dependence.

Creep ductility and modified Monkman-Grant equation for Gr.92 by incorporating total strain