Large drop in creep rupture strength in the long-term is a noticeable phenomenon for high Cr ferritic creep resistant steels, and the neglecting this phenomenon may result in overestimation of 100,000h creep rupture strength, and allowable stress. A committee at Japan Power Engineering and Inspection Corporation was organized to evaluate long-term creep strength and to review current allowable stresses of high Cr ferritic creep resistant steels. Life prediction method for high Cr ferritic creep resistant steels with tempered martensite microstructure is discussed. Appropriateness of current allowable tensile stress regulated in METI (Ministry of Economy, Trade and Industry) Thermal Power Standard Code has been assessed on a modified 9Cr-1Mo steel (ASME Gr.91) and KA-SUS410J3 type steels. KA-SUS410J3 is a material specification in METI Thermal Power Standard Code and corresponds to ASME Gr.122. The validity of existing allowable stress was shown on a modified 9Cr-1Mo steel. Those for KA-SUS410J3 type steels, however, have been revised to the lower values.
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ASME 2005 Pressure Vessels and Piping Conference
July 17–21, 2005
Denver, Colorado, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4186-3
PROCEEDINGS PAPER
Assessment of Long-Term Creep Strength and Review of Allowable Stress of High Cr Ferritic Creep Resistant Steels
Kazuhiro Kimura
Kazuhiro Kimura
National Institute for Materials Science, Tokyo, Japan
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Kazuhiro Kimura
National Institute for Materials Science, Tokyo, Japan
Paper No:
PVP2005-71039, pp. 237-244; 8 pages
Published Online:
July 29, 2008
Citation
Kimura, K. "Assessment of Long-Term Creep Strength and Review of Allowable Stress of High Cr Ferritic Creep Resistant Steels." Proceedings of the ASME 2005 Pressure Vessels and Piping Conference. Volume 1: Codes and Standards. Denver, Colorado, USA. July 17–21, 2005. pp. 237-244. ASME. https://doi.org/10.1115/PVP2005-71039
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