Creep data sheet for 9Cr-1Mo-V-Nb steel tubes, plates and pipe

Creep data of 9Cr-1Mo-V-Nb steel tube, plate, and pipe steels (ASME SA-213/SA-213 M Grade T91 Type 1, SA-387/SA-387 M Grade 91 Type 1, and SA-335/SA-335 M Grade P91 Type 1) were obtained in the temperature range of 450°C to 725°C and the stress range of 30MPa to 450MPa. The short-term tensile properties of the steels were also evaluated over a range of temperatures from room temperature to 750°C. Creep rupture data were regression analysed using Larson-Miller and Orr-Sherby-Dorn parameter with and without region splitting analysis (RSA) method. The result of creep rupture data evaluation using Larson-Miller parameter by means of RSA method with third and second order polynomials for high- and low-stress regimes, respectively, was the most appropriate and accurate. Minimum creep rate data was also evaluated by the same manner as time to rupture. Temperature dependence of 0.2% proof stress, tensile strength, and creep rupture strength at 100, 1,000, 10,000, and 100,000 h for 9Cr-1Mo-V-Nb tube, plate, and pipe steels.