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Effects of Mo, Cr, and V Additions on Tensile and Charpy Impact Properties of API X80 Pipeline Steels

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Abstract

In this study, four API X80 pipeline steels were fabricated by varying Mo, Cr, and V additions, and their microstructures and crystallographic orientations were analyzed to investigate the effects of their alloying compositions on tensile properties and Charpy impact properties. Because additions of Mo and V promoted the formation of fine acicular ferrite (AF) and granular bainite (GB) while prohibiting the formation of coarse GB, they increased the strength and upper-shelf energy (USE) and decreased the energy transition temperature (ETT). The addition of Cr promoted the formation of coarse GB and hard secondary phases, thereby leading to an increased effective grain size, ETT, and strength, and a decreased USE. The addition of V resulted in a higher strength, a higher USE, a smaller effective grain size, and a lower ETT, because it promoted the formation of fine and homogeneous of AF and GB. The steel that contains 0.3 wt pct Mo and 0.06 wt pct V without Cr had the highest USE and the lowest ETT, because its microstructure was composed of fine AF and GB while its maintained excellent tensile properties.

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Acknowledgments

This work was supported by the National Research Laboratory Program (Grant No. ROA-2004-000-10361-0 (2008)) funded by the Korea Science and Engineering Foundation and by POSCO (Pohang, Korea) under Contract No. 2007Y202.

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Authors and Affiliations

  1. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Seung Youb Han (Research Assistant), Sang Yong Shin (Postdoctoral Research Associate), Chang-Hyo Seo (Research Assistant), Sunghak Lee (Professor) & Nack J. Kim (Professor)

  2. Plate Research Group, Technical Research Laboratories, POSCO, Pohang, 790-785, Korea

    Hakcheol Lee (Researcher)

  3. Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Korea

    Sunghak Lee (Professor) & Nack J. Kim (Professor)

  4. Sheet Products & Process Research Group, Technical Research Laboratories, POSCO, Pohang, 790-785, Korea

    Jin-Ho Bae (Principal Researcher) & Kisoo Kim (Group Leader)

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  1. Seung Youb Han
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  2. Sang Yong Shin
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  3. Chang-Hyo Seo
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  6. Kisoo Kim
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  7. Sunghak Lee
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  8. Nack J. Kim
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Correspondence to Sunghak Lee.

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Manuscript submitted October 31, 2008.

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Han, S.Y., Shin, S.Y., Seo, CH. et al. Effects of Mo, Cr, and V Additions on Tensile and Charpy Impact Properties of API X80 Pipeline Steels. Metall Mater Trans A 40, 1851–1862 (2009). https://doi.org/10.1007/s11661-009-9884-3

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  • DOI: https://doi.org/10.1007/s11661-009-9884-3

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