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Microstructure-Mechanical Property Relationships for a Fe/Mn/Cr Rock Bolt Reinforcing Steel

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Abstract

The influence of low chromium additions to a 0.25C-1.5Mn semikilled steel on microstructure, and tensile and impact behaviors of high strength rock bolt reinforcing bars has been investigated. Although chromium imparted adequate tensile properties at ambient temperature (yield stress: 624 MPa; ultimate tensile stress: 819 MPa; elongation: 12.5%) by forming transformation products such as tempered martensite, lower and upper bainite, and small amounts of acicular ferrite, it increased the ductile-to-brittle transition temperature due to coarser upper bainite in the core region of bar having larger unit crack paths. The synthesized steel is considered to be effective in realizing the desired tensile properties, and suitable for application in rock bolt, as well as other reinforced concrete structures.

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Acknowledgments

Thanks are due the management of Steel Authority of India Limited, Bhilai Steel Plant, and Research & Development Center for Iron and Steel, Ranchi, where the work was carried out. Thanks are also due Mr. C.B. Sharma, Mr. A.K. Singh, Mr. B.B. Patra, Mr. John Guria, and Mr. S.N. Hoda for microstructural and tensile tests.

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  1. Padmanava College of Engineering, Sector 4, Rourkela, 769 002, India

    B. K. Panigrahi

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Correspondence to B. K. Panigrahi.

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Panigrahi, B.K. Microstructure-Mechanical Property Relationships for a Fe/Mn/Cr Rock Bolt Reinforcing Steel. J. of Materi Eng and Perform 19, 885–893 (2010). https://doi.org/10.1007/s11665-009-9540-5

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  • DOI: https://doi.org/10.1007/s11665-009-9540-5

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