(19)
(11) EP 2 857 531 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.04.2015 Bulletin 2015/17

(43) Date of publication A2:
08.04.2015 Bulletin 2015/15

(21) Application number: 14183234.5

(22) Date of filing: 02.09.2014
(51) International Patent Classification (IPC): 
C21D 9/08(2006.01)
C21D 1/25(2006.01)
C21D 8/10(2006.01)
 C21D 9/28(2006.01)
B21D 22/14(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 RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 23.09.2013 GB 201316829

(71) Applicant: Rolls-Royce plc
London SW1E 6AT (GB)

(72) Inventors:
  • Tuffs, Martin
    Nottingham, NG9 6HQ (GB)
  • Boswell, John Harold
    Derby, Derbyshire DE22 2HY (GB)
  • Whitehurst, George William
    Derby, DE73 6ST (GB)
  • Hill, Paul Owen
    Derby, Derbyshire DE21 4TR (GB)
  • Rawson, Martin John,
    Derby, Derbyshire DE56 0HB (GB)

(74) Representative: Routledge, John et al
Rolls-Royce plc Patents Department (SinB-38) P.O. Box 31
Derby DE24 8BJ
Derby DE24 8BJ (GB)

   


(54) Flow forming method


(57) A method of forming a shaped article. The method comprises providing a pre-form 40 comprising a chromium molybdenum vanadium steel alloy, heat treating the pre-form to obtain a surface hardness of between 420 and 480 according to the Vickers hardness test, and, subsequent to the heat treating step, flow forming the pre-form 40 to shape the pre-form.







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