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Microstructural analysis of service exposed IBN1 MARBN steel boiler tubing

conference contribution
posted on 2019-07-18, 10:35 authored by Scott Lockyer, Mark JepsonMark Jepson, Xu Xu, Will Philpott
Extensive research and development has been undertaken in the UK on MarBN steels. These were first proposed by Professor Fujio Abe from NIMS in Japan. Within the UK, progress has been made towards commercialisation of MarBN-type steel through a series of Government funded industrial collaborative projects (IMPACT, IMPEL, INMAP and IMPULSE). As part of the IMPACT project, which was led by Uniper Technologies, boiler tubes were manufactured from the MarBN steel developed within the project, IBN1, and installed on the reheater drums of Units 2 and 3 of Ratcliffe-on-Soar Power Station. The trial tubes were constructed with small sections of Grade 91 tubing on either side of the IBN1 to allow direct comparison after the service exposure. This is the world’s first use of a MarBN steel on a full-scale operational power plant. In September 2018 the first tube was removed having accumulated 11,727 hours operation and 397 starts. This paper reports microstructural and oxidation analysis, that has been undertaken by Loughborough University as part of IMPULSE project, and outlines future work to be carried out.


Loughborough University authors would like to thank the EPSRC and Innovate UK for funding through, IMPULSE - Advanced Industrial Manufacture of Next-Generation MARBN Steel for Cleaner Fossil Plant (Grant number: EP/N509942/1) and InnovateUK (formerly Technology Strategy Board) for funding our involvement in the IMPACT project (Project Number TP11/CAT/6/I/BP074G).



  • Aeronautical, Automotive, Chemical and Materials Engineering


  • Materials

Published in

Joint EPRI-123HiMAT International Conference on Advances in High Temperature Materials


LOCKYER, S. ... et al., 2019. Microstructural analysis of service exposed IBN1 MARBN steel boiler tubing. Presented at the Joint EPRI-123HiMAT International Conference on Advances in High Temperature Materials, Nagasaki, Japan, 21-25th October.


© Electric Power Research Institute (EPRI)


  • AM (Accepted Manuscript)

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This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

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  • en


Nagasaki, Japan

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