9Cr-1Mo-V steels (Gr. 91), which has an excellent performance at high temperature in mechanical properties and hydrogen resistance, has been used for tubing and piping materials in power industries and it can be a candidate material for high pressure vessels for high temperature processes in refining industries. The current Section VIII Division 2 of ASME code does not permit method A of paragraph 5.5.2.3 to be used for the exemption from fatigue analysis for Gr. 91 steels due to limitation of specified minimum tensile strength (585 MPa > 552 MPa). Method B of paragraph 5.5.2.4 also can’t be used because it requires the use of the fatigue curve which is limited to 371 °C lower than the needed temperature. Therefore new rules for fatigue evaluation of Gr. 91 steels at temperatures greater than 371 °C and less than 500 °C similar to CC 2605 for 2.25Cr-1Mo-0.25V(Gr. 22V) steels are necessary. This paper provides fatigue test results at 500 °C for Gr. 91 steels, the modification of CC 2605, sample inelastic analysis results for nozzles. Then, the new Code Case for Gr. 91 steels is proposed from these results.
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ASME 2015 Pressure Vessels and Piping Conference
July 19–23, 2015
Boston, Massachusetts, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5698-7
PROCEEDINGS PAPER
Proposed Code Case of Creep Fatigue Evaluation of 9Cr-1Mo-V Steels for High Pressure Vessels in ASME Section VIII Division 2
Susumu Terada,
Susumu Terada
Kobe Steel, Ltd., Takasago, Japan
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Masato Yamada,
Masato Yamada
Kobe Steel, Ltd., Takasago, Japan
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Tomoaki Nakanishi
Tomoaki Nakanishi
Kobe Steel, Ltd., Takasago, Japan
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Susumu Terada
Kobe Steel, Ltd., Takasago, Japan
Masato Yamada
Kobe Steel, Ltd., Takasago, Japan
Tomoaki Nakanishi
Kobe Steel, Ltd., Takasago, Japan
Paper No:
PVP2015-45327, V005T05A009; 10 pages
Published Online:
November 19, 2015
Citation
Terada, S, Yamada, M, & Nakanishi, T. "Proposed Code Case of Creep Fatigue Evaluation of 9Cr-1Mo-V Steels for High Pressure Vessels in ASME Section VIII Division 2." Proceedings of the ASME 2015 Pressure Vessels and Piping Conference. Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Competition and 23rd Annual Student Paper Competition; ASME NDE Division. Boston, Massachusetts, USA. July 19–23, 2015. V005T05A009. ASME. https://doi.org/10.1115/PVP2015-45327
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