Abstract
This paper describes the status of the art of the materials available on the market for the current Best Available Technologies for design and construction of the Ultra-SuperCritical (USC) Pulverised Coal Steam Power Plants to produce electricity. The new USC plants build in the last 10 years are able to reach 42–48% efficiency respect to 30% of the old subcritical (SubC) or 40–42% of the supercritical plants. This improvement is mainly due to the development of new materials in the years 1980–1990 able to work in more severe condition of temperature, pressure and aggressive environment and the consequent new design of boiler and steam turbine. The new materials developed are low chromium ferritic/bainitic, high chromium martensitic and the austenitic steels used in the different area of the power plants for manufacture of tubes and pipes, forged and cast components. These are joined by different welding technologies and materials also developed as function of materials and sizes of components.
Published Version
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