Growing energy demand promotes the construction of high performance energy plants with large scale. A dramatic increase of plant performance has been achieved by the enlargement of their major components such as turbine rotor shafts and pressure vessels. The Japan Steel Works, Ltd., has been continuing the efforts for improvements of production technology, material technology, reliability assessments and so on in order to attain high performance, high efficiency and reliable plants. The efforts gave birth to several epoch-making large and high quality forged components for energy plants. Recently, on the viewpoint of environmental problem such as global climate change, further development of new production technology and improvement of material has been continued. This paper gives an overview of the development of large high-quality forgings for high efficiency power generation plants.

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