The design or new power stations has undergone revolutionary changes in recent years. The advent of the practical use of nuclear fuels coupled with the constant and ever increasing demand for more power has necesitated the development of new materials of construction for the boiler walls, superheaters etc. to efficiently accomodate the higher temperatures needed to produce more power at greater capacity. The most important metals finding application in the modern super power plants are high chromium alloy steels and copper-chromium alloy steels. Nickel, molybdenum, aluminum and columbium are sometimes present as miscellaneous alloying elements.

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