ROTOR OF ROTARY MACHINE AND METHOD FOR MANUFACTURING SAME

摘要

A turbine rotor which is composed by connecting Ni-based alloy and heat resisting steel such as 12-Cr steel by welding to be able to ensure strength of welded parts and can be used under steam conditions of 700°C class and method of manufacturing the rotor are also provided. The rotor of the rotating machine into which working fluid of 650°C or higher is introduced, the rotor being composed of a plurality of members connected by welding such that material of each member is different in accordance with temperature of working fluid which flows contacting the members, wherein the first member(s) is formed from Ni-based alloy having mean linear expansion coefficient of 12.4×10-6/°C to 14.5×10-6/°C, preferably 14.0×10-6/°C or smaller within a temperature range from a room temperature to 700°C and second member(s) is formed from high-chrome steels, and the rotor is composed such that the first member(s) formed from Ni-base alloy is located in a portion which contact to the working fluid of 650°C or higher.