Alloys or metallic compositions – Nickel base – Chromium containing
Reexamination Certificate
2006-06-13
2011-11-29
Roe, Jessee R. (Department: 1733)
Alloys or metallic compositions
Nickel base
Chromium containing
C148S428000
Reexamination Certificate
active
08066938
ABSTRACT:
A wrought age-hardenable nickel-chromium-cobalt based alloy suitable for use in high temperature gas turbine transition ducts possessing a combination of three specific key properties, namely resistance to strain age cracking, good thermal stability, and good creep-rupture strength contains in weight percent 17 to 22 chromium, 8 to 15 cobalt, 4.0 to 9.1 molybdenum, up to 7 tungsten, 1.39 to 1.65 aluminum, 1.50 to 2.30 titanium, up to 0.80 niobium, 0.01 to 0.2 carbon, up to 0.01 boron, up to 3 iron, up to 1.5 tantalum and less than 0.02 zirconium, with a balance of nickel and impurities. Certain alloying elements must be present in amounts according to two equations here disclosed.
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Buchanan & Ingersoll & Rooney PC
Haynes International, Inc.
Roe Jessee R.
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