Endurance Strength and Residual Life Assessment of T23 Steel after 96000 Hours of High Temperature and High Pressure Service

Abstract The macroscopic morphology, oxide layer characteristics, rupture strength and residual life of T23 steel after 96000 hours service at high temperature pressure were analyzed. results show that pipe has good appearance, without obvious abnormal features such as cracks, folds, rolling breaks, double skin, scabs, delaminations sharp scratches. chemical composition different sections conforms to the standard, structure is mainly bainite, with uniform distribution no coarse phase. There an interface between metal substrate internal layer, there wavy line interface. relatively dense continuous. tensile properties room are good. At temperature, yield exceeds 420MPa, 540MPa, elongation 19%. After use, remaining creep split platen superheater submitted for inspection 84000 hours, rear 40000 hours.