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| Effect of Nb-Ti Microallyed on Welding Properties of Q345R Pressure Vessels Steel Plates |
| YANG Jing-hong1,WANG Xiao-yan2,LIU Gang1 |
（1. Luoyang Ship Materials Research Institute, Luoyang 471039,Henan, China
2 Masteel Technology Center, Ma’anshan 243000, Anhui, China） |
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Abstract By the mechanics test and microstructure observation, the joint weld properties of Q345R pressure vessels steel plates produced by conventional process and hot continuous rolling were investigated under different welding techniques such as shielded metal arc welding, gas metal arc welding and submerged metal arc. The hardness distribution measurements on the different welded specimens were conducted and the mechanical performance of joint weld for the steels was evaluated. The results show that the synthetics properties of continuous rolling Q345R joint weld are excellent and its impact toughness is higher than conventional process. The degree of hardening for coarsen zone of continuous rolling joint weld is least obviously. Better properties of joint weld come from microstructure refining as low carbon and Nb-Ti microalloyed design plus TMCP technology adoption.
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Received: 22 November 2010
Published: 20 February 2012
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2012, Vol. 47 
