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Microstructure and Thickness Effects on Impact Behavior and Separation Formation in X70 Pipeline Steel

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A Correction to this article was published on 13 April 2021

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Abstract

In an effort to optimize the transportation of oil and gas, the pipeline industry is developing large-diameter, thick-walled pipelines that can withstand low temperatures and high pressures. In this study, three X70 steel plates of similar chemistry, ranging in thickness from 13.5 mm to 22 mm, were subjected to drop-weight tear and Charpy V-notch tests to determine the effects of plate thickness and microstructure on the formation of separations and impact behavior. Constraint induced by specimen thickness appears to dictate the location of separations, the three microstructures exhibited different separation behaviors, and microstructural banding was not found to promote separation formation. Separations were most frequent when the primary fracture plane was parallel to the rolling direction. This study also found that standardized empirical relationships between Charpy V-notch and drop-weight tear tests do not estimate to the advanced high-strength and -toughness steels investigated.

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Acknowledgements

The author would like to acknowledge SABIC for providing the 13.5-mm and 15.5-mm plates and Baosteel for providing the 22-mm plate. The author would also like to thank EVRAZ North America for performing all DWT testing, and the National Institute of Standards and Technology (NIST) for performing all CVN testing. Finally, the author would like to thank colleagues and sponsors of the Advanced Steel Processing and Products Research Center at the Colorado School of Mines for their support. Commercial equipment, instrument, or materials are identified only in order to adequately specify certain procedures. In no case does such identification imply recommendation or endorsement by NIST. On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

  1. Department of Material and Metallurgical Engineering, Colorado School of Mines, Golden, CO, 80401, USA

    Emily B. Mitchell, Amy J. Clarke & Kester D. Clarke

  2. Applied Chemicals and Materials Division, National Institute of Standards and Technology, Boulder, CO, 80303, USA

    Enrico Lucon

  3. Process and Product Development, EVRAZ North America, Regina, SK, S4P 3C7, Canada

    Laurie E. Collins

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  1. Emily B. Mitchell
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Correspondence to Emily B. Mitchell.

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Mitchell, E.B., Lucon, E., Collins, L.E. et al. Microstructure and Thickness Effects on Impact Behavior and Separation Formation in X70 Pipeline Steel. JOM 73, 1966–1977 (2021). https://doi.org/10.1007/s11837-021-04562-9

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  • DOI: https://doi.org/10.1007/s11837-021-04562-9

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