Strain aging behavior can occur in almost all steels, including micro-alloyed steels used in high-strength pipelines. The direct effects of strain aging on mechanical properties can include increased hardness, yield strength and tensile strength, and reduced ductility and toughness. Strain aging may take place in processes where the pipe material experiences thermal cycles, such as coating, welding and in-service heating, and may occur with or without additional plastic strain. The changes of material mechanical properties could seriously challenge the design principles and methodologies, so that these aging effects need to be taken into account. This is especially important for pipelines expected to see deformation-controlled loading conditions. This is not only because the difference in strain aging effects between a weld and the parent material can easily change the strength overmatch condition of the weld, leading to unpredictable girth weld flaw tolerance, but also because the return of Lu¨ders behavior on the stress-strain curves of these materials significantly reduces the pipe buckling load resistance. In addition, any change in fracture resistance due to strain aging may impact the fracture control design practice, particularly if the pipe material may be expected to experience plastic deformation during service. In this paper, a brief review of strain aging behavior in steels is presented, with an emphasis on the effects on the mechanical properties and toughness of three high-strength line pipe steels. Material strain aging mechanical test procedures of three high grade pipes will be described and the test results will be discussed.
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2008 7th International Pipeline Conference
September 29–October 3, 2008
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute and the Pipeline Division
ISBN:
978-0-7918-4859-3
PROCEEDINGS PAPER
Strain Aging Effects in High Strength Line Pipe Materials Available to Purchase
Da-Ming Duan,
Da-Ming Duan
TransCanada Pipelines Limited, Calgary, Alberta, Canada
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Joe Zhou,
Joe Zhou
TransCanada Pipelines Limited, Calgary, Alberta, Canada
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Brian Rothwell,
Brian Rothwell
Brian Rothwell Consulting Inc., Calgary, Alberta, Canada
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David Horsley,
David Horsley
BP Exploration and Production Technology, Calgary, Alberta, Canada
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Nick Pussegoda
Nick Pussegoda
BMT Fleet Technology Ltd, Kanata, Ontario, Canada
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Da-Ming Duan
TransCanada Pipelines Limited, Calgary, Alberta, Canada
Joe Zhou
TransCanada Pipelines Limited, Calgary, Alberta, Canada
Brian Rothwell
Brian Rothwell Consulting Inc., Calgary, Alberta, Canada
David Horsley
BP Exploration and Production Technology, Calgary, Alberta, Canada
Nick Pussegoda
BMT Fleet Technology Ltd, Kanata, Ontario, Canada
Paper No:
IPC2008-64427, pp. 317-326; 10 pages
Published Online:
June 29, 2009
Citation
Duan, D, Zhou, J, Rothwell, B, Horsley, D, & Pussegoda, N. "Strain Aging Effects in High Strength Line Pipe Materials." Proceedings of the 2008 7th International Pipeline Conference. 2008 7th International Pipeline Conference, Volume 3. Calgary, Alberta, Canada. September 29–October 3, 2008. pp. 317-326. ASME. https://doi.org/10.1115/IPC2008-64427
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