(19)
(11) EP 2 803 737 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.11.2015 Bulletin 2015/45

(43) Date of publication A2:
19.11.2014 Bulletin 2014/47

(21) Application number: 14166981.2

(22) Date of filing: 05.05.2014
(51) International Patent Classification (IPC): 
C21D 8/12(2006.01)
C23C 10/04(2006.01)
C23C 10/60(2006.01)
 B21D 28/00(2006.01)
C23C 10/08(2006.01)
C21D 1/673(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: 16.05.2013 JP 2013103763

(71) Applicant: SUMITOMO HEAVY INDUSTRIES, LTD.
Tokyo 141-6025 (JP)

(72) Inventors:
  • Kinoshita, Tsukuru
    Kanagawa 237-8555 (JP)
  • Moritani, Koji
    Kanagawa 237-8555 (JP)

(74) Representative: Louis Pöhlau Lohrentz 
Patentanwälte Postfach 30 55
90014 Nürnberg
90014 Nürnberg (DE)

   


(54) Method of manufacturing pressed part and steel sheet for press working


(57) Provided is a method of manufacturing a pressed part, which imparts excellent formability on a steel sheet, and the steel sheet for press working used in the manufacturing of the pressed part when the pressed part is manufactured with a silicon steel sheet.
A manufacturing method includes a process of siliconizing a low-silicon steel sheet (14) which becomes a material of a high-silicon steel sheet in a state where a surface of a to-be-pressed portion (16) is coated with a mask (30); and a process of pressing the to-be-pressed portion (16) of the siliconized high-silicon steel sheet as a workpiece. Since the surface of the to-be-pressed portion (16) is coated with the mask (30) and the siliconizing treatment is performed, it is possible to obtain the high-silicon steel sheet in which the to-be-pressed portion (16) is softer than other portions. Since the high-silicon steel sheet is pressed, the steel sheet is excellent in formability during the press working.







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