600MPa Grade TMCP Steel with Low Yield Ratio and Excellent Weldability

Abstract:

A new lower cost 600MPa TMCP steel with high strength,good low temperature impact toughness,low yield ratio and excellent weldability has been developed successfully by design of alloy composition and thermal mechanical control process technology, and the welding heat affected zone(HAZ) have been investigated. The systematic studies show that the new developed steels gather high strength, high low temperature toughness, good seismic performance(low yield ratio) and excellent weldability, and the base steels have a good match of strength and toughness. A large number of fine acicular ferrite in HAZ can ensure that the welding plate has high strength and good low temperature impact toughness. The comprehensive performance of steel can meet fully the high-technical requirements of large-scale engineering.

• Periodical: Advanced Materials Research (Volume 534)
• Pages: 51-55
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.534.51
• Online since: June 2012
• Authors: Ming Wei Tong, Ze Xi Yuan, Kai Guang Zhang
• Keywords: Low Yield Ratio, Mechanical Property, TMCP Steel, Wedability

References

[1] J.M. Barsom. High performance steels and their use in structures, [in] Proceedings of the International Symposium on High Performance Applications, Cleveland, Ohio, 1995, p.155.

[2] S. Das and A. Ghosh. The effect of cooling rate on structure and properties of a HSLA forging, Scripta Mater., 48(2003), No. 1, p.51.

DOI: 10.1016/s1359-6462(02)00345-7

[3] B.C. Dooman, Structure-properties ralationhip in TRIP steels containing carbide-free bainite, Curr. Opinion Solid State Mater. Sci., 8(2004), p.285.

DOI: 10.1016/j.cossms.2004.10.002

[4] M. Zhang, R.Y. Fu, D.D. Cao, et al. Development of the micro-alloyed TRIP steels and properties of their laser welded blanks, Iron Steel(in chinese), 40(2005), p.754.

[5] B.A. Gravile. Cold cracking in welds in HSLA steels, [in] Proceedings on Welding of HSLA(Microalloyed) Structural Steels(Rome), Metals Park, Ohio ASM, 1978, p.85.

[6] H.B. Wu, S.W. Yang, A.M. Guo, et al. Thermo-stability of ultra-fine non-equilibrium microstructure,J. Univ. Sci. Technol. Beijing, 11(2004), No. 4, p.338.

[7] L. Zhang, W.Y. Yang, W.W. Zheng. Carbides/nitrides precipitates in a C-Mn strip by technology,J. Univ. Sci. Technol. Beijing, 12(2005), No. 6, p.517.

[8] Ichiro Tsukatani, Shun Ichi Hashimoto，Tsuyoshi Inoue. Effects of Silicon and Manganese Addition on MechanicalProperties of High-Strength H ot-Rolled Sheet Steel Containing Retained Austenite[J]. ISIJ Int, 1991, 31(10): 992-1000.

DOI: 10.2355/isijinternational.31.992

[9] Ryu H B Speer，Wise J P. Effect of Thermomechanical Processing on the Retained Austenite Content in a Si-Mn Transformation Induced-Plasticity Steel[J]. Metallurgical Transaction. 2002, 33A(9): 2811-2816.

DOI: 10.1007/s11661-002-0266-3

[10] Sugimoto K，Usui N，Kobayashi M，et a1. Effects of Volume Fraction and Stability of Retained Austenite on Ductility of TRIP-Aided Dual-Phase Steels[J]. ISIJ International. l992, 32 (12): l3ll-l3l8.

DOI: 10.2355/isijinternational.32.1311

[11] J. CERMAK, J. KUCERA, B. MILLION, AND J. LRUMPOS: Kor. Mater, 1980, 18, 537-547.

[12] H. Wada, R.D. Pehlke. Metall. Trans. 1985, 16B: 815.

[13] A.P. Coldren. Molybdenum Containing Steels for Gas and Oil Industry Application a State of the Art Review. 1976: 14.

[14] Yin Y. Z, Wang Y.C. Numerical Simulation of the Effects of Non-uniform Temperature Distributions on Lateral Torsional Buckling of Steel Beam, Journal of Constructional Steel esearch. Vol. 59. 2003, pp.1009-1033.

DOI: 10.1016/s0143-974x(03)00003-8

[15] Lee W. B, Hong S. G, Park C. G, etal. Influence of Mo on precipitation hardening in hot rolled HSLA steels containing Nb[J]. Scripta. 2000, 43(4): 319-324.

DOI: 10.1016/s1359-6462(00)00411-5