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| Microstructure and Mechanical Property of X70 Grade High Deformability Pipeline Steel |
| ZHAO Lian-yu1,ZHANG Zhi-jun2,SHI Xian-bo1,3,YAN Wei1,SHAN Yi-yin1,YANG Ke1 |
1. Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, Liaoning, China
2. Wuyang Iron and Steel Limited Liability Company, Hebei Iron and Steel Group, Pingdingshan 462500, Henan, China
3. School of Mateial and Matallurgy, University of Science and Technology of Liaoning, Anshan 114051, Liaoning, China |
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Abstract The (PF+B) dual-phase microstructure steel and AF microstructure steel were obtained based on alloy design, phase-transformation study and industrial trail rolling. Studies on microstructure and mechanical property of the (PF+B) steel and AF steel show that the polygonal ferrite (PF) phase appears when the relaxation is made below the Ar3 point, bainite (B) microstructure which is mainly composed of granular ferrite and bainite ferrite is obtained with accelerated cooling at 20℃/s after the termination of relaxation at proper temperature. The mechanical property of (PF+B) dual-phase microstructure shows obvious differences with the traditional AF microstructure. The steel with (F+B) microstructure has lower yield/tensile ratio and higher elongation than the AF microstructure steel, indicating a better deformability. An X70 grade pipeline steel with (F+B) microstructure was obtained, with wall-thickness of 30.8mm, which can meet the requirement for the offshore pipeline steel.
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Received: 08 October 2012
Published: 18 July 2013
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2013, Vol. 48 
