Patent ID: 9567656
Date: 2017-02-14
CPC Classifications: C22C,C22F,F01D,F05C

Claim:
1. A steam turbine rotor used at a temperature of 750° C. or higher, comprising at least two parts along a steam flow direction and assembled by welding the at least two parts, wherein a higher temperature part of the at least two parts on a side where steam enters is a forged product made of a Ni based alloy, the Ni based alloy including: 0.001 to 0.04 wt. % of C; 12 to 23 wt. % of Cr; 3.5 to 5.0 wt. % of Al; more than 15 wt. % but not more than 23 wt. % of Co; 5 to 12 combined wt. % of W and Mo in which the Mo content is 5 wt. % or less; 0.5 or less combined wt. % of Ti, Ta and Nb; and the balance of Ni and inevitable impurities, wherein Ni