Research and Development of a Yield Strength 400 MPa Class Structural Steel Plate with Enhanced Weldability


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A 400 MPa yield strength structural steel plate with enhanced weldability was produced by using advanced steel making technology and thermo-mechanical controlled processing technique. A microstructure consisting of acicular ferrite (3~8 μm) and polygonal ferrite was observed in the rolled plate, which exhibits a yield strength ≥ 420 MPa, tensile strength ≥ 560 MPa, elongation ≥ 26 % and charpy impact toughness ≥ 300 J at-40 °C. Three-wire flux copper backing submerged arc welding with heat input of 230 kJ/cm was applied to butt weld the 36 mm thick plate, and defect-free joint with satisfactory mechanical properties were produced. The coarse grain heat affected zone (CGHAZ) contains mostly intra-granular nucleated ferrite plus a few grain boundary ferrite and ferrite side plate, and shows charpy impact toughness ≥ 90 J at-40 °C. The enhancement impact toughness of CGHAZ resultant from high heat input welding is due to improvement of intra-granular ferrite formation induced by Ca and Ti containing oxides and sulphides.



Materials Science Forum (Volumes 783-786)

Main Theme:

Edited by:

B. Mishra, M. Ionescu and T. Chandra






Y. Zhang et al., "Research and Development of a Yield Strength 400 MPa Class Structural Steel Plate with Enhanced Weldability", Materials Science Forum, Vols. 783-786, pp. 1046-1052, 2014

Online since:

May 2014




* - Corresponding Author

[1] C.M. Kim, J.B. Lee, W.Y. Choo, Characteristics of single pass welds in 50 kJ/mm of heavy thickness shipbuilding steel, Proceedings of the 13th Inter Offshore and Polar Engineering Confer, Honolulu, Hawaii, USA, 2003, 90-96.

[2] A. Kojima, K.I. Yoshii, T. Hada, Development of high HAZ toughness steel plates for box columns with high heat input welding, Nippon Steel Tech. Rep., 90 (2004) 39-44.

[3] S. Okano, T. Koyama, Y. Kobayashi, M. Yamauchi, TMCP type HT570 steel plates with excellent weldability, Kobe Steel Eng. Rep., 55 (2005) 20-24.

[4] W. Sun, G.D. Wang, J.M. Zhang, D.X. Xia, H. Sun, Microstructure characterization of high heat input welding joint of HSLA steel plate for oil storage construction, J. Mater. Sci. Technol., 25 (2009) 857-860.

[5] Y.I. Komizo, Status and prospects of shipbuilding steel and its weldability, Trans JWRI 36 (2007) 1-6.

[6] K. Abe, M. Izumi, M. Shibata, H. Imamura, High tensile strength steel plates for high heat input welding, Kobe Steel Eng. Rep., 55 (2005) 26-29.

[7] A. Kojima, K. Yoshii, T. Hada, O. Saeki, K. Ichikawa, Y. Yoshida, Y. Shimura, K. Azuma, Development of high HAZ toughness steel plates for box columns with high heat input welding, Nippon Steel Tech. Rep., 90 (2004) 39-44.

[8] M. Minagawa, K. Shida, Y. Funatsu, S. Imai, 390MPa yield strength steel plate for large heat input welding for large container ships, Nippon Steel Tech. Rep., 380 (2004) 6-8.

[9] S. Suzuki, K. Ichimiya, T. Akita, High tensile strength steel plates with excellent HAZ toughness for shipbuilding - JFE EWEL technology for excellent quality, JFE Tech. Rep., 5 (2005) 24-29.

[10] H. Kawano, M. Shibata, S. Okano, Y. Kobayashi, Y. Okazaki, TMCP steel plate with excellent HAZ toughness for high-rise buildings, Kobe Steel Eng. Rep., 54 (2004) 110-113.

[11] J. S. Park, B. Jung, J.B. Lee, Effect of high heat input on CTOD property of the thick steel plate for offshore engineering, POSCO Tech. Rep., 10 (2007) 46-49.

[12] K. Zhu, Z.G. Yang, Effect of magnesium on the austenite grain growth of the heat affected zone in low carbon high strength steels, Metall. Mater. Trans., 42A (2011) 2207-2213.

DOI: 10.1007/s11661-011-0647-6

[13] M. Van Ende, M. Guo, R. Dekkers, M. Burty, J. Van Dyck, P.T. Jones, Formation and evolution of Al-Ti oxide inclusions during secondary steel refining, ISIJ Inter., 49 (2009) 1133-1140.

DOI: 10.2355/isijinternational.49.1133

[14] I. Tamura, Some fundamental steps in thermo-mechanical processing of steels, ISIJ Inter., 27 (1987) 763-779.

[15] Y. Zhang, X. Pan, J.C. Xie, Development of 610MPa grade steel plate with low yield ratio through thermo-mechanical controlled processing with accelerated cooling, Proceedings of the 10th Inter Confer on Steel Roll, Beijing, China, 2010, 214-219.

[16] C.I. Garcia, M. Hua, A.J. DeArdo, Particle stimulated nucleation of ferrite in micro-alloyed steel, MS&T, 2009, 1591-1602.

[17] J.L. Lee, Y.T. Pan, The formation of intra-granular acicular ferrite in simulated heat-affected zone, ISIJ Inter., 35 (1995) 1027-1033.

DOI: 10.2355/isijinternational.35.1027

[18] J.S. Byun, Non-metallic inclusions and intra-granular acicular nucleation of ferrite on Ti-killed C-Mn steel, Acta Mater., 51 (2003) 1593-1606.

DOI: 10.1016/s1359-6454(02)00560-8

[19] Y. Zhang, X. Pan, X.B. Li, Industrial development of steel plate suitable for high heat input welding, Proceedings of Bao-steel Academic Conference, 2013, June, Shanghai, G42-46.

[20] N. Kikuchi, S. Nabeshima, Y. Kishimoto, T. Matsushita, S. Sridhar, Effect of Ti de-oxidation on solidification and post-solidification microstructure in low carbon high manganese steel, ISIJ Inter., 47(2009) 1255-1264.

DOI: 10.2355/isijinternational.47.1255

[21] C. van der Eiij, J Walmsley, Effects of titanium containing oxide inclusions on steel weldability, Proceedings of the 6th Inter Confer on Trends in Welding Research, Georgia, USA, (2002).

[22] Φ. Grong, A.O. Kluken, H.K. Nylund, A.L. Dons, J. Hjelen, Catalyst effects in heterogeneous nucleation of acicular ferrite, Metall Mater Trans, 26A (1995) 525-534.

DOI: 10.1007/bf02663903

[23] B. Wen, B. Song, In situ observation of the evolution of intra-granular acicular ferrite at Ce-containing inclusions in 16Mn steel. Steel Res. Inter., 839 (2012) 487-495.

DOI: 10.1002/srin.201100266

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