Creep and rupture properties of longitudinal seam welded hot reheat piping

Post exposure creep rupture testing was performed on two longitudinal seam welded hot reheat piping samples. The first pipe was 2-1/4Cr-1Mo steel with a large inside surface repair weld that had been given a subcritical postweld heat treatment. The weld had a shallow lack of fusion defect at the root pass. Weldment rupture specimens oriented in the hoop direction of the pipe were tested at 41.4 MPa and 665 C, 650 C and 635 C. The failure path...