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Advances in Materials Science and Engineering
Volume 2017, Article ID 7409873, 13 pages
https://doi.org/10.1155/2017/7409873
Research Article

Mechanical Properties of High-Nb X80 Steel Weld Pipes for the Second West-to-East Gas Transmission Pipeline Project

1Key Lab of Metastable Materials Science & Technology, College of Materials Science & Engineering, Yanshan University, Qinhuangdao 066004, China
2School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
3CNPC Bohai Equipment Manufacturing Co. Ltd., Qingxian 062658, China
4School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China

Correspondence should be addressed to Fu-ren Xiao; nc.ude.usy@oaixrf

Received 20 April 2017; Revised 23 August 2017; Accepted 7 September 2017; Published 2 November 2017

Academic Editor: Pavel Lejcek

Copyright © 2017 Gui-ying Qiao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The mechanical properties of steel pipe have great effects on the integrality and operation safety of gas transmission pipeline. In order to reduce the cost of the steel pipe, the high-Nb X80 pipeline steels with the different alloying systems have been used in the Second West-to-East Gas Transmission Pipeline Project. Nevertheless, an investigation into the effects of chemical composition on the mechanical properties of steel pipes is lacking. In this work, the chemical composition and mechanical properties of high-Nb X80 grade steel pipes with a diameter of ϕ1,219 mm and a wall thickness of 22 mm, which are coiled by steels manufactured by three mills, have been analyzed. Furthermore, the effects of chemical composition of the steels on the mechanical properties of the pipe body and weld joint were discussed.