(19)
(11) EP 1 640 465 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.04.2006 Bulletin 2006/14

(43) Date of publication A2:
29.03.2006 Bulletin 2006/13

(21) Application number: 05018830.9

(22) Date of filing: 30.08.2005
(51) International Patent Classification (IPC): 
C22C 19/05(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(30) Priority: 03.09.2004 US 934920

(71) Applicant: HAYNES INTERNATIONAL, INC.
Kokomo, Indiana 46904-9013 (US)

(72) Inventor:
  • Pike, Lee M. Jr.
    Kokomo Indiana 46901 (US)

(74) Representative: Fuchs Mehler Weiss & Fritzsche 
Naupliastrasse 110
81545 München
81545 München (DE)

   


(54) Ni-Cr-Co-Mo alloy for advanced gas turbine engines


(57) 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 9.5 molybdenum, up to 7 tungsten, 1.28 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, and up to 3 iron, 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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