Abstract
In order to ascertain that a method to evaluate a creep strength based on the interparticle spacing between carbides is applicable, creep strength measurements were made on about 14 kinds of 2.25Cr-1Mo steel used in actual boilers operated at up to 870K and compared with those estimated by calculation. The results of this study are as follows:
(1) The creep rupture curve obtained by the calculation, which is based on the change in interparticle spacing added by connections considering decrease in the cross section area of the test piece due to oxidation and creep deformation, well fit the result of creep rupture test.
(2) The creep rupture time obtained by this calculation is in the range of 2/3 to 3/2 times of that obtained by creep rupture test.
