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The Toughness Index of X80 Mother Linepipe Steel and Its Optimum Microstructure

[+] Author Affiliations
Xiaoli Zhang

Zhong Yuan University, Zhengzhou, China

Yaorong Feng, Yinglai Liu, Chuanjing Zhuang

Tubular Goods Research Centre of CNPC, Xi’an, China

Paper No. PVP2008-61062, pp. 669-673; 5 pages
doi:10.1115/PVP2008-61062
From:
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 1: Codes and Standards
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4824-1 | eISBN: 0-7918-3828-5
  • Copyright © 2008 by ASME

abstract

Large amount of experimental data indicated, that the index of CVN toughness and shearing area of mother pipe of X80 are (200J, 90%). And the results showed that when charpy toughness was closing to 200J, the shearing area would reach to 90%; when the charpy toughness increased continuously, the shearing area would not increase further more. So the selection of charpy toughness value as 200J for pipeline steels is reasonable, and also its corresponding shearing area. To gain thus component index, the optimum microstructure of X80 steel should be strip-like ferrite mastered, small amount of granular bainite contained-acicular ferrite type steel, and, in which the size of MA island should be less than 1μm. This kinds of optimum microstructure of X80 pipeline steel will exert its softening role in improving toughness and simultaneity not decrease its strength.

Copyright © 2008 by ASME

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