Mechanical Response and Performance Relationship of X70 Pipeline Steel with Weld Zone

Abstract:

With the development of the natural gas industry, high flux natural gas pipelines will cause local deformation because of pressurization, which has an important effect in the service safety of pipeline materials. In this paper, the X70 pipeline steel with weld zone was studied, and the tensile test was used to simulate the uniaxial tensile stress. The results showed that the strain was mainly concentrated in the weld zone, which can imply that the weld zone has high strain hardening ability. The heat-affected zone with poor internal structure was prone to breakage. The research results can provide theoretical basis and experimental basis for pipeline steel welding process design and safety evaluation under high flux conditions.

• Periodical: Materials Science Forum (Volume 993)
• Pages: 622-627
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.993.622
• Online since: May 2020
• Authors: Gang Wu*, Peng Zhang, Jin Heng Luo, Li Feng Li, Guang Da Xu, Li Xia Zhu
• Keywords: Microstructure, Morphology, Strain Response, Weld Zone, X70 Pipeline Steel

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