(19)
(11) EP 2 267 174 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.05.2012 Bulletin 2012/18

(43) Date of publication A2:
29.12.2010 Bulletin 2010/52

(21) Application number: 10165664.3

(22) Date of filing: 11.06.2010
(51) International Patent Classification (IPC): 
C22C 33/08(2006.01)
C21D 5/00(2006.01)
 C22C 37/10(2006.01)
C21D 1/32(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated Extension States:
BA ME RS

(30) Priority: 23.06.2009 US 489872

(71) Applicant: General Electric Company
Schenectady, NY 12345 (US)

(72) Inventors:
  • Bouse, Gregory Keith
    Greer, SC 29650 (US)
  • Jackson, Joseph Jay
    Greer, SC 29650 (US)
  • Parolini, Jason Robert
    Greer, SC 29650 (US)
  • Thangirala, Subrahmanyam
    Schenectady, NY 12304 (US)

(74) Representative: Szary, Anne Catherine 
GE International Inc. Global Patent Operation - Europe 15 John Adam Street
London WC2N 6LU
London WC2N 6LU (GB)

   


(54) Simo ductile iron castings for gas turbine applications


(57) A cast article of a ductile iron wherein the ductile iron includes carbon from about 2.8 to 3.7 weight percent, silicon from about 3.0 to 3.5 weight percent, molybdenum from 0.8 to 1.5 weight percent, magnesium from about 0.025 to 0.60 weight percent, sulfur less than 0.01 weight percent and nickel from about 0.0 to 1.3 weight percent, the remaining content being iron is provided. The cast article is suitable for a gas turbine casing. A method of manufacturing a cast article is also provided.







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