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 Fe3C, 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.
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2006 International Pipeline Conference
September 25–29, 2006
Calgary, Alberta, Canada
Conference Sponsors:
- Pipeline Division
ISBN:
0-7918-4263-0
PROCEEDINGS PAPER
The Micro Structural Characteristic Parameters of High Grade Pipeline Steel and its Mechanical Properties
Xiaoli Zhang,
Xiaoli Zhang
CNPC Research Institute of Tubular Goods/Xi’an Jiao Tong University, Xi’an, Shaanxi, China
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Chuanjing Zhuang,
Chuanjing Zhuang
CNPC Research Institute of Tubular Goods, Xi’an, Shaanxi, China
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Lingkang Ji,
Lingkang Ji
CNPC Research Institute of Tubular Goods, Xi’an, Shaanxi, China
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Yaorong Feng,
Yaorong Feng
CNPC Research Institute of Tubular Goods, Xi’an, Shaanxi, China
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Wenzhen Zhao,
Wenzhen Zhao
Xi’an Jiao Tong University, Xi’an, Shaanxi, China
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Chunyong Huo,
Chunyong Huo
CNPC Research Institute of Tubular Goods, Xi’an, Shaanxi, China
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Xinwei Zhao,
Xinwei Zhao
CNPC Research Institute of Tubular Goods, Xi’an, Shaanxi, China
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Shaotao Gong
Shaotao Gong
CNPC Research Institute of Tubular Goods, Xi’an, Shaanxi, China
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Xiaoli Zhang
CNPC Research Institute of Tubular Goods/Xi’an Jiao Tong University, Xi’an, Shaanxi, China
Chuanjing Zhuang
CNPC Research Institute of Tubular Goods, Xi’an, Shaanxi, China
Lingkang Ji
CNPC Research Institute of Tubular Goods, Xi’an, Shaanxi, China
Yaorong Feng
CNPC Research Institute of Tubular Goods, Xi’an, Shaanxi, China
Wenzhen Zhao
Xi’an Jiao Tong University, Xi’an, Shaanxi, China
Chunyong Huo
CNPC Research Institute of Tubular Goods, Xi’an, Shaanxi, China
Xinwei Zhao
CNPC Research Institute of Tubular Goods, Xi’an, Shaanxi, China
Shaotao Gong
CNPC Research Institute of Tubular Goods, Xi’an, Shaanxi, China
Paper No:
IPC2006-10256, pp. 251-259; 9 pages
Published Online:
October 2, 2008
Citation
Zhang, X, Zhuang, C, Ji, L, Feng, Y, Zhao, W, Huo, C, Zhao, X, & Gong, S. "The Micro Structural Characteristic Parameters of High Grade Pipeline Steel and its Mechanical Properties." Proceedings of the 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. pp. 251-259. ASME. https://doi.org/10.1115/IPC2006-10256
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