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Effect of Cooling Rate and Finish Rolling Temperature on Structure and Strength of API 5LX70 Linepipe Steel Plate

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Abstract

The present study has investigated the effect of changes in accelerated cooling (ACC) and finish rolling temperature (FRT) on the mechanical properties of high-strength low-alloy (HSLA) Nb-V-Ti steel plate of non-sour API 5LX70 linepipe during the thermomechanical controlled process (TMCP). Tensile test results showed that increasing ACC or reducing FRT enhanced yield and tensile strengths of the subject steel, which was also confirmed by the Vickers hardness test. Microstructure examinations demonstrated that increasing ACC and reducing FRT resulted in a lower volume fraction and a finer size of pearlite. Moreover, an increase in the ACC enhanced the formation of granular ferrite (GF) and fine polygonal ferrite (FPF), while a decrease in the FRT mostly affected the formation of acicular ferrite (AF). In all microstructures, banded structures and particles with a size of approximately 6 μm were observed due to segregation during solidification, where changing the parameters did not affect their formations.

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Acknowledgments

The authors gratefully acknowledge full support provided by General Manager, Deputy Managers of R&D, Technical, and Control and Quality, as well as the staff of TMCP mill and Testing Laboratory of Khouzestan Oxin Steel Company (KOSC). Our thanks should also go to the Manager and the staff of Material Testing Laboratory of the School of Mining and Metallurgy of the Amirkabir University of Technology. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

  1. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran

    N. Amirjani & M. Ketabchi

  2. Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

    M. Eskandari

  3. Metallurgy and Manufacturing Processes Organization, Khouzestan Oxin Steel Company, Ahvaz, Iran

    M. Hizombor

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  1. N. Amirjani
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Amirjani, N., Ketabchi, M., Eskandari, M. et al. Effect of Cooling Rate and Finish Rolling Temperature on Structure and Strength of API 5LX70 Linepipe Steel Plate. J. of Materi Eng and Perform 29, 4275–4285 (2020). https://doi.org/10.1007/s11665-020-04961-0

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