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Effects of Cooling Paths on Through-Thickness Microstructure and Mechanical Properties of Heavy Gauge X80 Pipeline Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The effects of various cooling paths on uniformity of through-thickness microstructure and mechanical properties of X80 pipeline steel of 22.0 mm in thickness were studied. The finite difference method was employed to calculate the temperature field during cooling. It was confirmed by the experimental result and temperature field calculation that the optimizing process was achieved by the ultra-fast cooling with medium cooling capacity (cooling rate of ~23 K/s) followed by ultimate cooling capacity (cooling rate of ~50 K/s). After optimization, the experimental steel displayed much uniform microstructure and the deviation of through-thickness hardness was controlled within 20 HV. In addition, the yield strength, tensile strength and elongation of the experimental steel were 621, 728 MPa and 21.5%, respectively, meeting the requirements of the API standard for X80 pipeline steels.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51234002) and the Fundamental Research Funds for the Central Universities (N130407001).

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Authors and Affiliations

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China

    Xu-Dong Li, Cheng-Ning Li, Guo Yuan & Guo-Dong Wang

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  1. Xu-Dong Li
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  2. Cheng-Ning Li
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  3. Guo Yuan
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Correspondence to Guo Yuan.

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Li, XD., Li, CN., Yuan, G. et al. Effects of Cooling Paths on Through-Thickness Microstructure and Mechanical Properties of Heavy Gauge X80 Pipeline Steel. Acta Metall. Sin. (Engl. Lett.) 30, 483–492 (2017). https://doi.org/10.1007/s40195-017-0557-8

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  • DOI: https://doi.org/10.1007/s40195-017-0557-8

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