Patent ID: 8794913

Claim:
A steam turbine facility comprising a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine, wherein the intermediate-pressure turbine is separated into a first intermediate-pressure turbine on a high-temperature and high-pressure side and a second intermediate-pressure turbine on a low-temperature and low-pressure side, wherein the high-pressure turbine, the second intermediate-pressure turbine, and the low-pressure turbine are integrated to form an integrated structure having a casing and a rotor in common, wherein the integrated structure and the first intermediate-pressure turbine are connected together on a same axis or are arranged on different axes from each other, wherein at least any one of rotors and casings of steam-introduction-side turbines into which steam with a temperature of 650° C. or higher is introduced is formed from Ni-based alloy, and wherein at least any one of overall rotors and overall casings of turbines are constructed by joining together a plurality of rotor members or casing members by welding.