Patent ID: 9200524
Filing Date: 2015-12-01
Classification: F01D,F05D

Abstract:
1. A steam turbine rotor, comprising: a steam turbine low-pressure final stage long blade made of a precipitation hardening type martensitic stainless steel containing, in mass, 0.1% or less of C, 0.1% or less of N, 9.0% to 14.0% inclusive of Cr, 9.0% to 14.0% inclusive of Ni, 0.5% to 2.5% inclusive of Mo, 0.5% or less of Si, 1.0% or less of Mn, 0.25% to 1.75% inclusive of Ti, 0.25% to 1.75% inclusive of Al, and the balance consisting of Fe and inevitable impurities, and a disk containing, in mass, 0.10% to 0.35% of C, 0.50% or less of Si, 0.33% or less of Mn, 8.0% to 13.0% of Cr, 0.5% to 3.5% of Ni, 1.5% to 4.0% of Mo, 0.05% to 0.35% of V, 0.02% to 0.30% in total of at least one kind of Nb and Ta, 0.02% to 0.15% of N, and the balance consisting of Fe and inevitable impurities, wherein the disk is joined to a final stage section of the stream turbine rotor made of a low-alloy steel.