Pulverised coal combustion (PCC) power plant with supercritical (SC) steam parameters have

been operational for over forty years and ultra-supercritical (USC) PCC plant have been

operational for just over twenty years. This significant amount of operating experience is

valuable regarding the performance of high temperatures steels. For example 9–12% chromium

martensitic steels have had problems with cracking and some have not been as strong as they

were projected to be. Additionally, PCC power plant have been operated outside of design

parameters, such as severe cyclic operation, which has resulted in unforeseen problems for high

temperature steels. This report assesses the performance, problems, solutions and research

efforts for high temperature steels used in SC and USC technology.

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