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Transactions of the Indian Institute of Metals

, Volume 71, Issue 10, pp 2517–2526 | Cite as

The Analysis of Low Temperature Toughness on X80 Pipeline Steel Welded Joint

  • Bin Wang
  • Yingchao Xu
  • Jing Hu
  • Senfeng Zhang
  • Chengwu Cui
  • Hongxia Lan
Technical Paper
  • 43 Downloads

Abstract

Aiming at the security problems of pipeline steel application, the different positions of the welded joints of circumferentially welding pipeline of X80 steel were investigated by microstructure observation, the hardness, Charpy impact toughness and crack tip opening displacement (CTOD) test at low temperature. The Vickers hardness test results show that there are local softened regions in heat-affected zone (HAZ). Charpy impact test indicate that the ductile–brittle transition temperature of weld is below − 60 °C, the ductile–brittle transition temperature of HAZ is around − 38 °C. CTOD test reveal that the fracture toughness of HAZ shows a large fluctuation since it is in the ductile–brittle transition temperature regime.

Keywords

X80 pipeline steel Welded joint Microstructure Fracture toughness 

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Copyright information

© The Indian Institute of Metals - IIM 2018

Authors and Affiliations

  • Bin Wang
    • 1
    • 2
  • Yingchao Xu
    • 1
  • Jing Hu
    • 1
  • Senfeng Zhang
    • 1
  • Chengwu Cui
    • 1
  • Hongxia Lan
    • 1
  1. 1.School of Materials Science and EngineeringSouthwest Petroleum UniversityChengduChina
  2. 2.Sichuan Provincial Research Center of Welding Engineering TechnologyChengduChina

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