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Creep Strength Enhanced Ferritic (CSEF) Steels

CSEF Steels e.g P91, P92, have found wide use in high temperature applications where creep is an important design consideration. Here we define creep as the slow accumulation of plastic damage due to a combination of stress and temperature.



As temperature increases not only is creep of design consideration but oxidation also becomes of major concern. One consequence of higher temperatures is that the diffusion of elements is enhanced with increasing temperature therefore materials used in these applications require a stable microstructure as is practical for the expected service life. Hence the development of the 9-12% Cr steels with high levels of alloying elements to promote creep strength, have good oxidation resistance and a stable microstructure.

A major drawback of being highly alloyed is that the process window for manufacture and fabrication of components is very tight where deviation from the optimum conditions can lead to inadequate microstructures and consequently inadequate service lives. The correlation between non optimum processing and service life has appeared after these materials have entered service and much effort is spent by utilities managing the service lives of components manufactured from CSEF steels.

This online workshop will cover alloy developments, processing and service experience, including microstructural modelling, codes and standards, inspection, repair and life management. It will bring the latest information from academia, alloy producers, technology providers, OEM’s and plant operators with the aim of enhancing the management of 9-12%CR CSEF steels.

The virtual conference is organised by the High Temperature Materials Committee of IOM3 to promote the understanding of the behaviour of high temperature structural materials to improve both their reliability and performance in service applications.

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