Study on the Precipitation Behavior of the Drill Pipe Steel Microalloyed with Nb

Abstract:

A new drill pipe steel microalloyed with 0.04 w.t.% Nb was designed to meet the needs of drilling operation in super-deep wells, and the precipitation behavior of Nb during temper was studied in detail. The results show the austenitic grain can be refined by the addition of 0.04 w.t.% Nb, and the steel has a high yield strength of 1192MPa, high tensile strength of 1226MPa and high impact absorbing energy of 137J when the steel is quenched at 900°C and tempered at 550°C, moreover, the volume fraction and dimension of precipitates increases with increasing temper temperature. When the new steel is tempered at 550°C, the new steel has the best comprehensive performance due to the fine dispersed precipitates. The mechanical properties of the new steel are much better than that of the common drill pipe steel.

• Periodical: Advanced Materials Research (Volumes 335-336)
• Pages: 63-68
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.335-336.63
• Online since: September 2011
• Authors: Xin Xu, Sheng Yin Song, Yao Rong Feng, Xin Hu Wang
• Keywords: Drill Pipe Steel, Precipitation, Tempering, Toughness

References

[1] S. L. Lu, Y. R. Feng, F. Q. Luo, et al., Failure analysis of IEU drill pipe wash out, International Journal of Fatigue, 2005, 27(10-12): 1360-1365.

DOI: 10.1016/j.ijfatigue.2005.07.012

[2] B. A. Dale, An experimental investigation of fatigue crack growth in drillstring tubulars [R]. SPE 15559, 1988: 356-362.

DOI: 10.2118/15559-pa

[3] A. Baryshnikov, A. Calderoni, A. Ligone, et al., A new approach to the analysis of drillstring fatigue behavior [R]. SPE 30524, 1995: 753-764.

[4] J. E. Hansford, A. Lubinski, Cumulative fatigue damage of drill pipe in dog-legs, Journal of Petroleum Technology, 1966, 18(3): 359-363.

DOI: 10.2118/1258-pa

[5] C. Y. Chen, H. W. Yen, F. H. Kao, et al., Precipitation of high-strength low alloy steels by nanometer-sized carbides, Materials Science and Engineering A, 2009, 499(1-2): 162-166.

DOI: 10.1016/j.msea.2007.11.110

[6] J. C. Cao, Q. L. Yong, Q. Y. Liu, et al., Precipitation of MC phase and precipitation strengthening in hot rolled Nb-Mo and Nb-Ti steels. Journal of Materials Science, 2007, 42(24): 10080-10084.

DOI: 10.1007/s10853-007-2000-4

[7] M. Charleux, W. J. Poole, M. Militzer, et al., Precipitation behavior and its effect on strengthening of an HSLA-Nb/Ti steel. Metallurgical and Materials Transactions A, 2001, 32(7): 1635-1647.

DOI: 10.1007/s11661-001-0142-6

[8] W. B. Lee, S. G. Hong, C. G. Park, et al., Carbide precipitation and high-temperature strength of hot-rolled high-strength, low-alloy steels containing Nb and Mo, Metallurgical and Materials Transactions A, 2002, 33(6): 1689-1698.

DOI: 10.1007/s11661-002-0178-2

[9] W. M. Mao, J. C. Zhu, J. Li, et al., The structure and properties of metallic materials [M]. Tsinghua University Press, Beijing. 2008.