(19)
(11) EP 2 722 407 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.10.2017 Bulletin 2017/43

(43) Date of publication A2:
23.04.2014 Bulletin 2014/17

(21) Application number: 13189010.5

(22) Date of filing: 16.10.2013
(51) International Patent Classification (IPC): 
C21D 6/00(2006.01)
C21D 1/18(2006.01)
C22C 38/44(2006.01)
C22C 38/00(2006.01)
 C21D 9/00(2006.01)
C21D 1/26(2006.01)
C22C 38/06(2006.01)
F01D 5/28(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: 17.10.2012 JP 2012229408

(71) Applicant: Mitsubishi Hitachi Power Systems, Ltd.
Yokohama 220-8401 (JP)

(72) Inventors:
  • Oikawa, Shinji
    Tokyo, 100-8280 (JP)
  • Yoda, Hideo
    Tokyo, 100-8280 (JP)
  • Arai, Masahiko
    Tokyo, 100-8280 (JP)
  • Doi, Hiroyuki
    Tokyo, 100-8280 (JP)

(74) Representative: Beetz & Partner mbB 
Patentanwälte Steinsdorfstraße 10
80538 München
80538 München (DE)

   


(54) Precipitation hardening martensitic stainless steel and long blade for steam turbine using the same


(57) A precipitation hardening martensitic stainless steel is provided with excellent mechanical property and corrosion resistance and contains, by mass, 0.1% or less of C; 0.1% or less of N; 10.0% ~ 15.0% of Cr; 10.0% ~ 15.0% of Ni; 0.5% ~ 2.5% of Mo; 1.0% ~ 3.0% of Al; 1.0% or less of Si; 1.0% or less of Mn, and the rest is Fe and inevitable impurities. A steam turbine long blade (10) is made of the precipitation hardening martensitic stainless steel.







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