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Tensile Properties of Boronized N80 Steel Tube Cooled by Different Methods

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Abstract

The microstructures and tensile properties of boronized N80 steel pipes by pack boriding under four different cooling conditions were investigated. The boride layer was composed of FeB and Fe2B phases with a hardness range of 1200-1600 HV. Fan cooling and fan cooling with a graphite bar in the center of the boriding agent were employed to improve the tensile properties. As cooling velocity was increased, the thickness of boride layer and grain size of the steel substrate were consequently reduced, whereas the pearlite volume in steel substrate was increased, resulting in improvement of tensile properties. Boronized N80 steel pipe which was fan cooled with a graphite bar inside possessed the highest ultimate tensile strength and yield strength, in accordance with the mechanical properties required by API SPEC 5L. Fracture surface analysis revealed that the boronized N80 steel showed ductile fracture at room temperature.

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Acknowledgment

The authors thank the Project 985-automotive engineering of Jilin University.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Key Laboratory of Automobile Materials, Ministry of Education, Nanling Campus of Jilin University, Changchun, 130025, People’s Republic of China

    X. Tian, J. An & Y. Lu

  2. Songyuan Daduo Oilfield Accessory Industry Co. Ltd., Songyuan, 138000, People’s Republic of China

    Y.L. Yang, S.J. Sun & Z.G. Wang

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  1. X. Tian
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  2. Y.L. Yang
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  3. S.J. Sun
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  4. J. An
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  5. Y. Lu
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  6. Z.G. Wang
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Correspondence to J. An.

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Tian, X., Yang, Y., Sun, S. et al. Tensile Properties of Boronized N80 Steel Tube Cooled by Different Methods. J. of Materi Eng and Perform 18, 162–167 (2009). https://doi.org/10.1007/s11665-008-9270-0

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  • DOI: https://doi.org/10.1007/s11665-008-9270-0

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