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US 4,058,417 AGranted
Turbine bucket alloy
AssigneeGeneral Electric Company
InventorsRichard Thomas Bicicchi, Albert Samuel Melilli
Life of this patent
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Abstract
Relates to wrought forged turbine bucket alloys comprising martensitic stainles steel free from ferrite and having critical amounts of chromium, nickel and carbon.
Claims3
A forged turbine bucket formed from an alloy having a martensitic structure and free from ferrite throughout, said alloy consisting essentially of:
- ______________________________________ Element Weight Percent ______________________________________ Carbon .05 - .07 Manganese .70 - 1.00 Phosphorus .020 max. Sulphur .020 max. Silicon .30 - .50 Nickel 3.50 - 4.25 Chromium 11.20 - 12.25 Molybdenum .30 - .50 Aluminum .03 max. Vanadium .03 max. Tin .03 max. Iron Remainder ______________________________________
- the forged alloy product being characterized by a yield strength (0.02% -- offset) in excess of 100,000 psi and a tensile strength in excess of 130,000 psi.
Dependencies are inferred from the claim text.