Creep constitutive equations for parent, Type IV, R-HAZ, CG-HAZ and weld material in the range 565-640 °C for Cr-Mo-V weldments

Creep deformation and rupture data over the temperature range 565-640 °C for the parent, Type IV, refined-heat affected zone, coarse grained-heat affected zone and weld materials, associated with a 0.5Cr-0.5Mo-0.25V ferritic steel parent material welded with a 2.25Cr-1Mo steel, has been collected and used to determine a constitutive equation parameter set. The constitutive equation parameter set has been generated for use in a future investigation to analyse a welded medium-bore branched vessel tested at 590 °C; and, also to permit extrapolation and interpolation over the temperature range 565-640 °C.