Mitsubishi Hitachi Power Systems, Ltd.

Kimmitsu Maruyama

Takashi Nakano

Kenji Kawasaki

Shin Nishimoto

Takashi Shige

Yoshiaki Fukunaga

A turbine rotor has suitable strength and toughness without causing soaring manufacturing costs and prolonged manufacturing time. The turbine rotor is constructed by welding a rotor member for high temperature made of high Cr steel to a rotor member for low temperature made of low Cr steel. The high temperature rotor member is formed from high Cr steel of which the nitrogen content is 0.02% or higher by mass %. A filler material welds the high temperature rotor member and the low temperature rotor member together, and is a 9% Cr-based filler material of which the nitrogen content is 0.025% or lower by mass %.

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Tokyo, Japan

Kimmitsu Maruyama