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High-temperature Tensile Properties and Creep Life Assessment of 25Cr35NiNb Micro-alloyed Steel

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Abstract

Reformer tubes in petrochemical industries are exposed to high temperatures and gas pressure for prolonged period. Exposure of these tubes at severe operating conditions results in change in the microstructure and degradation of mechanical properties which may lead to premature failure. The present work highlights the high-temperature tensile properties and remaining creep life prediction using Larson-Miller parametric technique of service exposed 25Cr35NiNb micro-alloyed reformer tube. Young’s modulus, yield strength, and ultimate tensile strength of the steel are lower than the virgin material and decreases with the increase in temperature. Ductility continuously increases with the increase in temperature up to 1000 °C. Strain hardening exponent increases up to 600 °C, beyond which it starts decreasing. The tensile properties are discussed with reference to microstructure and fractographs. Based on Larson-Miller technique, a creep life of at least 8.3 years is predicted for the service exposed material at 800 °C and 5 MPa.

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Acknowledgments

The authors acknowledge Numaligarh Refineries Limited, India for providing the reformer tube necessary for the work. The authors are also grateful to Central Instruments Facility, IIT Guwahati, India for extending the SEM facility.

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  1. Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India

    Amitava Ghatak & P. S. Robi

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  1. Amitava Ghatak
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  2. P. S. Robi
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Correspondence to Amitava Ghatak.

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Ghatak, A., Robi, P.S. High-temperature Tensile Properties and Creep Life Assessment of 25Cr35NiNb Micro-alloyed Steel. J. of Materi Eng and Perform 25, 2000–2007 (2016). https://doi.org/10.1007/s11665-016-2016-5

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  • DOI: https://doi.org/10.1007/s11665-016-2016-5

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