Abstract
Creep tests of 2.25Cr-1Mo-V steel weld metal, which was made with tandem submerged arc process, were conducted. Temperature and stress levels for the creep tests were chosen so as to lead to short-time rupture of about 1,000 hours. Three creep prediction methods, such as Monkman-Grant law, Modified θ Projection and Ω method, were applied to each obtained creep curve. All three methods were proved to be practical for weld metal as well as base material. On the other hand, in the aspect of the perdition from early-stage, the Monkman-Grant law was proved to be most effective in this research. The equation, obtained in this study, was applicable also to 2.25Cr-1Mo weld metal containing various amounts of V, Nb, B, and W.
