Turbine rotor and steam turbine

摘要

A turbine rotor 10 is disposed in a steam turbine, into which high-temperature steam of 650°C or more is introduced, and separately configured of the portion made of the Ni-base alloy and the portion made of the CrMoV steel depending on a steam temperature and a metal temperature, and the individual portions having a small difference in coefficient of linear expansion are welded mutually.