(19)
(11) EP 2 957 647 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.01.2016 Bulletin 2016/02

(43) Date of publication A2:
23.12.2015 Bulletin 2015/52

(21) Application number: 15171821.0

(22) Date of filing: 12.06.2015
(51) International Patent Classification (IPC): 
C22C 38/00(2006.01)
C21D 6/02(2006.01)
C22C 38/02(2006.01)
C22C 38/06(2006.01)
C22C 38/44(2006.01)
C22C 38/48(2006.01)
 C21D 6/00(2006.01)
C21D 1/18(2006.01)
C22C 38/04(2006.01)
C22C 38/42(2006.01)
C22C 38/46(2006.01)
C22C 38/50(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
Designated Validation States:
MA

(30) Priority: 19.06.2014 JP 2014125901
28.10.2014 JP 2014218985
02.12.2014 JP 2014243681

(71) Applicant: Daido Steel Co.,Ltd.
Nagoya Aichi 461-8581 (JP)

(72) Inventors:
  • IBUKI, Motohiro
    Nagoya-shi, Aichi 457-8545 (JP)
  • SHIMIZU, Takayuki
    Nagoya-shi, Aichi 457-8545 (JP)

(74) Representative: Diehl & Partner GbR 
Patentanwälte Erika-Mann-Strasse 9
80636 München
80636 München (DE)

   


(54) STEEL FOR COLD WORKING TOOL


(57) The present invention relates to a steel for cold working tool, containing, on a % by mass basis: C: 0.70% to 0.90%; Si: 0.60% to 0.80%; Mn: 0.30% to 0.50%; P: 0.30% or less; S: 0.030% or less; Cu: 0.01% to 0.25%; Ni: 0.01% to 0.25%; Cr: 6.0% to 7.0%; Mo + 1/2W: 2.50% to 3.00%; V: 0.70% to 0.85%; N: 0.020% or less; O: 0.0100% or less; and Al: 0.100% or less, with the balance being Fe and inevitable impurities, in which 1.66 (Mo + 1/2W) + V < 5.7% is satisfied.







Search report









Search report