USC 발전설비 용접부 HAZ 조직의 내 크리프 특성

T/P92 steels are created for using USC boiler tube and header in next generation power plant. SP-Creep test and tensile creep test are performed to characterize creep for local structures of T/P92 steel weldment. The results are shown that P92 steel weldment is clearly superior than that of X20CrMoV121 steel weldment, which is widely used in supercritical power plant. While fine grain HAZ is most weakest in X20 steel weldment, coarse grain HAZ is most weakest in P92.