High strength heat-resisting cast steel steam turbine casing steam turbine power plant and steam turbine

摘要

An object of the present invention is to provide a steam turbine of high thermal efficiency and a steam turbine power plant using the steam turbine, a casing for a steam turbine used therein, and a heat-resistant cast steel thereof by making use of ferritic steels at a steam temperature of 610 to 660 ° C do.;The constitution of the present invention is characterized in that the main components such as the rotor shaft exposed to the high temperature portion and the intermediate pressure portion are made of ferritic steel and the main steam temperature and the reheated steam temperature are 610 to 660 ° C and the steam turbine power plant have.;The rotor is made of a combination of martensite steel alone or a Ni-based alloy and the rotor of the turbine is made of ferritic steel having a creep rupture strength of 100 kg / mm 2 Time creep rupture strength of 10 kg / mm 2 or more.