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The Micro Structural Characteristic Parameters of High Grade Pipeline Steel and its Mechanical Properties

[+] Author Affiliations
Xiaoli Zhang

CNPC Research Institute of Tubular Goods/Xi’an Jiao Tong University, Xi’an, Shaanxi, China

Chuanjing Zhuang, Lingkang Ji, Yaorong Feng, Chunyong Huo, Xinwei Zhao, Shaotao Gong

CNPC Research Institute of Tubular Goods, Xi’an, Shaanxi, China

Wenzhen Zhao

Xi’an Jiao Tong University, Xi’an, Shaanxi, China

Paper No. IPC2006-10256, pp. 251-259; 9 pages
  • 2006 International Pipeline Conference
  • Volume 3: Materials and Joining; Pipeline Automation and Measurement; Risk and Reliability, Parts A and B
  • Calgary, Alberta, Canada, September 25–29, 2006
  • Conference Sponsors: Pipeline Division
  • ISBN: 0-7918-4263-0
  • Copyright © 2006 by ASME


The microstructure of high grade pipeline steels, including X65, X70, X80, X100, were studied by SEM and EBSD, respectively. It was found that the microstructures of high grade pipeline steels were composed of lower bainite, granular bainite and acicular ferrite. The phases of kinds of pipeline steels were composed of Fe3 C, retained austenite and ferrite. And their percentage content, grain size and its distribution were studied respectively also. These micro structural parameters were correlated to the mechanical properties of kinds of pipeline steels. Furthermore, all kinds of angles of grain boundaries were studied, and the relationship between the angles of grain boundaries and mechanical properties was obtained. It was shown that as the improving of the steel grade, the grain boundary including small angle and large angle increased. And only when grain boundary was greater than 15 degree, it was effective to the toughness behavior.

Copyright © 2006 by ASME



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