ROTOR SHAFT FOR STEAM TURBINE, STEAM TURBINE POWER GENERATING PLANT, AND STEAM TURBINE THEREOF

摘要

PROBLEM TO BE SOLVED: To raise a temperature with a steam temperature by means of heat resistance steel by forming a rotor journal part, a low temperature range part, and a rotor barrel part of martensite steel including each element by a specified weight ratio, and having alloy component whose high temperature strength is higher than that of a journal part in a barrel part of welding property is lower than that. ;SOLUTION: A rotor journal part and a low temperature range part are made of martensite steel containing C: 0.06 to 0.14%, Si: 0.5% or below, Mn: 2% or below, Cr: 7 to 12%, Ni: 0.1 to 1.0, V: 0.05 to 0.3%, Nb: 0.01 to 0.20%, N: 0.005 to 0.1% by weight. The rotor barrel part is made of martensite steel containing C: 0.06 to 0.04%, Si: 0.15 or below, Mn: 1% or below, Cr: 8 to 12% Ni: 0.1 to 1.0%, V: 0.05 to 0.3%, Nb: 0.01 to 0.20%, N: 0.005 to 0.1% by weight. Its barrel part has alloy components whose high temperature strength is higher than that of a journal part or molten property is lower than that, It is thus possible to obtain heat resistance cast steel having high creep rupture strength and room temperature toughness at 600 to 660°C.;COPYRIGHT: (C)1997,JPO