Patent ID: 6574966
Filing Date: 2003-06-10
Classification: C21D,C22C,F01D,F02C,F05D

Abstract:
A gas turbine for power generation, including a compressor, a combustor, at least three stages of turbine blades fixed to turbine disks, and at least three stages of turbine nozzles corresponding to said stages of turbine blades, characterized in thatsaid gas turbine has an air cooling line for cooling said turbine disks by flowing air compressed by said compressor from a center of rotation axis of said turbine disks to said turbine blades; said turbine disks are each made from a martensite steel; and said turbine disks on first and second stages are made of a martensite steel which contains by weight 0.05-0.20% of C, 0.15% or less of Si, 0.20% or less of Mn, 0.50-3.0% of Ni, 8.0-13.0% of Cr, 1.0-4.0% of Mo, 0.10-0.40% of V, 0.01-0.20% of Nb, 1.0-5.0% of Co, and 0.025-0.125% of N.