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Correlation Between Microstructures and Tensile Properties of Strain-Based API X60 Pipeline Steels

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Abstract

The correlation between the microstructures and tensile properties of strain-based American Petroleum Institute (API) X60 pipeline steels was investigated. Eight types of strain-based API X60 pipeline steels were fabricated by varying the chemical compositions, such as C, Ni, Cr, and Mo, and the finish cooling temperatures, such as single-phase and dual-phase regions. In the 4N and 5C steels, the volume fractions of bainitic ferrite (BF) and the secondary phases increased with the increasing C and adding Cr instead of Ni. In the 5C and 6NC steels, the volume fractions of acicular ferrite (AF) and BF decreased with increasing C and adding Ni, whereas the volume fractions of polygonal ferrite (PF) and the secondary phases increased. In the 6NC and 6NM steels, the volume fraction of BF was increased by adding Mo instead of Cr, whereas the volume fractions of PF and the secondary phases decreased. In the steels rolled in the single-phase region, the volume fraction of polygonal ferrite ranged from 40 to 60 pct and the volume fraction of AF ranged from 20 to 40 pct. In the steels rolled in the dual-phase region, however, the volume fraction of PF was more than 70 pct and the volume fraction of AF was below 20 pct. The strength of the steels with a high volume fraction of AF was higher than those of the steels with a high volume fraction of PF, whereas the yield point elongation and the strain hardening exponent were opposite. The uniform elongation after the thermal aging process decreased with increasing volume fraction of PF, whereas the uniform elongation increased with increasing volume fraction of AF. The strain hardening exponent increased with increasing volume fraction of PF, but decreased with increasing volume fraction of AF and effective grain size.

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Acknowledgments

This work was supported by the Ministry of Knowledge Economy under a Grant No. 100400-25, the Ministry of Land, the Infrastructure and Transport under a Grant No. 14IFIP-B067087-02-000000 and the 2013 Research Fund of University of Ulsan.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, ReCAPT Gyeongsang National University, Jinju, 52828, Korea

    Hyo Kyung Sung (Assistant Professor)

  2. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 37673, Korea

    Dong Ho Lee (Research Assistant), Sunghak Lee (Professor) & Hyoung Seop Kim (Professor)

  3. POSCOA Research Group Team, Technical Research Laboratories, POSCO, Gwangyang, 57807, Korea

    Yunjo Ro (Researcher) & Chang Sun Lee (Senior Vice President)

  4. Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul, 01811, Korea

    Byoungchul Hwang (Assistant Professor)

  5. School of Materials Science and Engineering, University of Ulsan, Ulsan, 44610, Korea

    Sang Yong Shin (Assistant Professor)

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  1. Hyo Kyung Sung
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  2. Dong Ho Lee
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Correspondence to Sang Yong Shin.

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Manuscript submitted July 16, 2015.

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Sung, H.K., Lee, D.H., Lee, S. et al. Correlation Between Microstructures and Tensile Properties of Strain-Based API X60 Pipeline Steels. Metall Mater Trans A 47, 2726–2738 (2016). https://doi.org/10.1007/s11661-016-3453-3

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  • DOI: https://doi.org/10.1007/s11661-016-3453-3

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