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A Study on the Characterization of Mechanical Properties of Grade X80 High Strain Line Pipe Steel
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Author: Weihua Sun, Shue Hu, Guobao Li, Hao Yu, lei Zhang, Liwei Liu
Abstract: This paper introduces mechanical and metallurgical properties of 27mm thick Grade X80 high strain line pipe steel which aims at constructing long distance natural gas over permafrost and seismic areas. The steel is molybdenum and boron free. Dual phase of the X80 steel plates are regulated by thermal-mechanical controlled processing. The outer diameter of 1219mm pipes are manufactured by UOE process. DWTT toughness and longitudinal tensile properties including the Rt0.5/Rm, Rt1.5/Rt0.5 and Rt2.0/Rt1.0 are analyzed on both the plates and the pipes. Strain aging properties are also evaluated on the base material of the pipe, demonstrating that the pipe complies well with the pipeline construction requirements. Strengthening effects of precipitates are analyzed, revealing a 58.1MPa strengthening contribution by precipitates less than 20nm in size. Dislocation hardening is approximately 176MPa in the present studied steel.
Keywords: High Strain; Line Pipe; Dual Phase Microstructure; Uniform Elongation; Precipitation; Dislocation Hardening
References:
[1] D. Belato Rosado, W. De Waele, D. Vanderschueren, S. Hertelé, Latest Developments in Mechanical Properties and Metallurgical Features of High Strength Line Pipe Steels, http://ojs.ugent.be/index.php/SCAD/issue/view/130
[2] J. Shimamura, M. Okatsu, N. Ishikawa, K. Nishimura1,Y. Murakami, S. Tsuyama, R. Muraoka, Material Design Concept in Heavy Wall X100 High Strength Linepipe Steel, in: Proceedings of the Twenty-first (2011) International Offshore and Polar Engineering Conference, Maui, Hawaii, USA, June 19-24, 2011:33-38
[3] N. Ishikawa, S. Endo, J. Honda，Development of Ultra-High Strength Line pipes with Dual-Phase Microstructure for High Strain Application，JFE Technical Report, No. 7 (Jan. 2006):20-26
[4] N. Ishikawa, N. Shikanai, J. Konda, High Performance UOE Linepipes: JFE Technical Report, No. 12 (Oct. 2008):15-19
[5] J. Hammond, High Strength Pipeline Standardization and Specification, in: Proc. of International Seminar on Development, Specification and Welding of High Strength Pipeline. Beijing, 2006:3
[6] K. Jonsson, D. Ivey, H. Henein, S. Nafisi, The effect of Microstructure on the Mechnical Properties of X80 Micrialloyed Steel, Iron and Steel Technology, (8) 2012:127-133
[7] N. Ishikawa, M. Okatsu, S. Endo, N. Shikanai, R. Muraoka, J. Kondo, Mechanical and Metallurgical Properties of Grade X80 High Strain Linepipe Produced by Heat Treatment On-line Process, in: Proc. of the Eighteenth (2008) International Offshore and Polar Engineering Conference, Vancouver, BC, Canada, July 6-11, 2008
[8] M. Okatsu, T. Shinmiya, N. Ishikawa, S. Endo, J. Kondo, Development of High Strength Linepipe with Excellent Deformability, in: Proc. of OMAE2005 24th International Conference on Offshore Mechanics and Arctic Engineering (OMAE 2005), June 12-17, 2005, Halkidiki, Greece:1-8
[9] A. Liessem, M. K. Graef, G. Knauf, U. Marewski, Influence of thermal treatment on mechanical properties of UOE linepipe, in: Proc. of the international Pipeline Technology Conference, Ostend, Belgium, vol. 1, pp. 1263-1281, 2004
[10] Y. Shinohara et al., Change on Mechanical Properties of High Strength Line Pipe by Thermal Coating Treatment, in: Proc. of 24th International Conference on Offshore Mechanics and Arctic Engineering, Paper No. OMAE2005-67055. Halkidiki, Greece, June 12- 17, 2005
[11] Y. Shinohara, T. Hara, E. Tsuru, H. Asahi, Y. Terada, N. Doi, Change of Mechanical Properties of High Strength Line Pipe by Thermal Coating Treatment, Proc. of OMAE2005 24th International Conference on Offshore Mechanics and Arctic Engineering (OMAE 2005), June 12-17, 2005, Halkidiki, Greece:1-8
[12] H. Shitamoto, M. Hamada, S. Okaguchi, N. Takahashi, N. Yamamoto, I. Takeuchi, S. Fujita, Effect of thermal aging on deformability of X80 SAW Pipes, in: Pipeline Technology Conference, Ostend, 12-14 October 2009:1-14
[13] Nicholas Ohms, Tearing Resistance of High Strength Line Pipe Steels. Master's dissertation, Ghent University, July 2015
[14] T. Ungar, L. Li, G. Tichy, W. Pantleon, H. Choob and P. K. Liawb, Work softening in nanocrystalline materials induced by dislocation annihilation. Scripta Materialia, 64 (2011), 876-879
[15] Y.F. Shena, C.M. Wang, X. Sun, A micro-alloyed ferritic steel strengthened by nanoscale precipitates, Materials Science and Engineering A, 528 (2011), pp 8150-8156