Extensive studies to develop high deformability linepipe have been conducted. In case of linepipes laid at seismic region, higher resistance to buckling against large strain induced by earthquake related ground movements are required. In order to improve the deformability of pipes, two different types of microstructural control technologies were proposed, base on theoretical and analytical studies on the effect of microstructural characteristics on stress-strain behavior. Grade X65 to X100 linepipes with ferrite-bainite microstructure were manufactured by optimizing the microstructural characteristics. Grade X80 linepipe with bainitic microstructure containing dispersed fine M-A constituents particles was also developed by applying new conceptual TMCP process. Deformability of developed linepipes with two different types of microstructure were evaluated by axial compression test, and all the developed linepipes showed superior resistance to buckling comparing with conventional pipes. Tensile properties after thermal coating of developed high deformability pipe was also investigate. It was shown that increase in yield strength by thermal strain aging was minimized and round-house type stress-strain curve was maintained for the linepipe manufactured by new conceptional TMCP process.
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ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
June 12–17, 2005
Halkidiki, Greece
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
0-7918-4197-9
PROCEEDINGS PAPER
Development of High Strength Linepipe With Excellent Deformability Available to Purchase
Mitsuhiro Okatsu,
Mitsuhiro Okatsu
JFE Steel Corporation, Fukuyama, Japan
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Toyohisa Shinmiya,
Toyohisa Shinmiya
JFE Steel Corporation, Fukuyama, Japan
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Nobuyuki Ishikawa,
Nobuyuki Ishikawa
JFE Steel Corporation, Fukuyama, Japan
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Shigeru Endo,
Shigeru Endo
JFE Steel Corporation, Fukuyama, Japan
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Joe Kondo
Joe Kondo
JFE Steel Corporation, Fukuyama, Japan
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Mitsuhiro Okatsu
JFE Steel Corporation, Fukuyama, Japan
Toyohisa Shinmiya
JFE Steel Corporation, Fukuyama, Japan
Nobuyuki Ishikawa
JFE Steel Corporation, Fukuyama, Japan
Shigeru Endo
JFE Steel Corporation, Fukuyama, Japan
Joe Kondo
JFE Steel Corporation, Fukuyama, Japan
Paper No:
OMAE2005-67149, pp. 63-70; 8 pages
Published Online:
November 11, 2008
Citation
Okatsu, M, Shinmiya, T, Ishikawa, N, Endo, S, & Kondo, J. "Development of High Strength Linepipe With Excellent Deformability." Proceedings of the ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 3. Halkidiki, Greece. June 12–17, 2005. pp. 63-70. ASME. https://doi.org/10.1115/OMAE2005-67149
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