Investigation on the Weldability of a Zr-Ti Microalloyed Pipeline Steel X120

Yu Qun Yin; Hong Hong Wang; Yong Kuan Yao; Li Li; Xuan Wei Lei; Jin Bin Zhao; Kai Ming Wu

doi:10.4028/www.scientific.net/AMR.538-541.1478

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 538-541Investigation on the Weldability of a Zr-Ti...

Investigation on the Weldability of a Zr-Ti Microalloyed Pipeline Steel X120

Abstract:

Welding thermal cycle simulation with the heat input of 12~25 kJ/cm and practical welding were undertaken to investigate the weldability of a Zr-Ti microalloyed pipeline steel X120. The microstructure in the simulated coarse-grained heat-affected zone was predominantly bainite. The Vickers hardness and room temperature impact toughness of simulated coarse-grained heat-affected zone is 276~297 (HV10) and 208~225 J, respectively. These results indicated that the X120 steel had good weldability. Practical plate welding with the heat input of 21 kJ/cm also showed that the Zr-Ti microalloyed pipeline steel X120 had high yeild strength (895 MPa) and low temperature (-30°C) impact toughness (183 J, 204 J and 208 J in the fusion line, coarse-grained heat-affected zone and fine-grained heat-affected zone, respectively).

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Periodical:

Advanced Materials Research (Volumes 538-541)

Pages:

1478-1483

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.538-541.1478

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Online since:

June 2012

Authors:

Yu Qun Yin, Hong Hong Wang, Yong Kuan Yao, Li Li, Xuan Wei Lei, Jin Bin Zhao, Kai Ming Wu

Keywords:

Bainite, Heat Affected Zone (HAZ), Weldability, Welding Thermal Cycle, X120

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