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Creep data of 9Cr-1Mo-V-Nb steel tube, plate, and pipe steels (ASME SA-213/SA-213M Grade T91 Type 1, SA-387/SA-387M Grade 91 Type 1, and SA-335/SA-335M 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 reasonably conservative. 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 100,000h for 9Cr-1Mo-V-Nb tube, plate, and pipe steels.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Creep strength enhanced ferritic steel, Grade 91, Creep rupture strength, 100,000h, Minimum creep rate, Time-temperature parameter, Region splitting analysis

Date published: 2025-12-31

Publisher: Informa UK Limited

Journal:

• Science and Technology of Advanced Materials: Methods (ISSN: 27660400) vol. 5 issue. 1 2588872

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1080/27660400.2025.2588872

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Updated at: 2025-12-05 08:30:10 +0900

Published on MDR: 2025-12-05 08:23:52 +0900