Steam turbine rotor and alloy therefor
AssigneeGeneral Energy Company
InventorsSteven Louis Breitenbach, Deepak Saha
Life of this patent
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Abstract
An alloy suitable for use in a rotor, such as one or more regions of a steam turbine rotor, as well as a forged rotor formed with the alloy. The alloy consists of, by weight, 0.20 to 0.30% carbon, 0.80 to 1.5% chromium, 0.80 to 1.5% molybdenum, 0.50 to 0.90% vanadium, 0.30 to 0.80% nickel, 0.05 to 0.15% titanium, 0.20 to 1.0% manganese, and 0.005 to 0.012% boron, the balance iron, optionally low levels of other alloying constituents, and incidental impurities.
Claims20
An alloy adapted for forming at least a portion of a forged turbine rotor, the alloy consisting of, by weight, 0.20 to 0.30% carbon, 0.80 to 1.3% chromium, 0.80 to 1.5% molybdenum, 0.50 to 0.90% vanadium, 0.30 to 0.80% nickel, 0.05 to 0.15% titanium, 0.20 to 1.0% manganese, and 0.005 to 0.012% boron, the balance iron and incidental impurities.
An alloy adapted for forming at least a portion of a forged steam turbine rotor, the alloy consisting of, by weight, 0.90 to 1.3% chromium, 1.0 to 1.5% molybdenum, 0.60 to 0.80% vanadium, 0.20 to 0.25% carbon, 0.07 to 0.12% titanium, 0.005 to 0.010% boron, 0.65 to 0.85% manganese, 0.30 to 0.60% nickel, up to 0.25% silicon, up to 0.008% phosphorous, up to 0.010% sulfur, up to 0.008% tin, up to 0.015% arsenic, and up to 0.015% aluminum, the balance iron and incidental impurities.
Dependencies are inferred from the claim text.