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| Relationship Between Microstructures and Mechanical Properties of Strain Based Design X80 Pipeline Steel |
| NIU Hui1,2,LIU Qing-you2,3,YANG Zhong-wen1,2,BI Zong-yue1,2,JIA Shu-jun2,3,CHEN Chang-qing1,2 |
1. Steel Pipe Research Institute, CNPC Baoji Petroleum Steel Pipe Co., Ltd., Baoji 721008， Shaanxi, China
2. Chinese National Engineering Research Center for Petroleum and Natural Gas Tubular Goods,Baoji 721008， Shaanxi, China
3. Institute for Engineering Steel, Central Iron andSteel Research Institute, Beijing 100081, China |
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Abstract The west part of the third west-east nature gas transmission line traverses some active geological fault and strong earthquake region in which case 1219mm×26.4mm X80 high-deformable line pipe is required for strain-based design. The effects of ferrite volume fraction and grain size of 1219mm×26.4mm X80 high-deformable ferrite and banite dual phase steel on the longitudinal yield strength, uniform elongation and Charpy V-notch energy was investigated. Meanwhile, the relationship between microstructures and mechanical properties, the effects of pipe forming and aging on longitudinal mechanical properties were described through analyzing the industrial data. It was found that the tensile property is not sensitive to the ferrite volume fraction. However, less ferrite volume can promote the improvement of Charpy V-notch energy. Ferrite grain refinement plays an important role for improving tensile properties and fracture toughness. It is necessary to refine the polygonal ferrite grain size.
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Received: 12 October 2012
Published: 19 August 2013
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2013, Vol. 48 
