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

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Abstract:

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.

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Periodical:

Materials Science Forum (Volumes 783-786)

Pages:

1046-1052

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.783-786.1046

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Online since:

May 2014

Authors:

Yu Zhang*, Xiao Bao Li, Xin Pan

Keywords:

Heat-Affected Zone, High Heat Input Welding, Impact Property, Intra-Granular Nucleated Ferrite, Structural Steel Plate

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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