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Title:
HOT STAMP MOLDED BODY AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2018/134874
Kind Code:
A1
Abstract:
In this method for producing a hot stamp molded body, a blank material is formed from a steel plate, first tempering of the blank material is performed, and second tempering of the blank material is formed after the first tempering. During the first tempering, the blank material is heated to a first temperature of (Ac3 point – 50)°C to 1200°C inclusive at an average heating speed of 2°C/second or more and cooled from the first temperature to a second temperature of 250°C or less. During the second tempering, the blank material is heated to a third temperature that is (Ac3 point – 50)°C or more but no more than 1200°C from the second temperature at an average heating speed of 2°C/second or more and cooled from the third temperature to a fourth temperature of 250°C or less. The blank material is molded during the first tempering and/or the second tempering.

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Inventors:
ABUKAWA GENKI (JP)
HAYASHI KUNIO (JP)
HIKIDA KAZUO (JP)
KAWASAKI KAORU (JP)
Application Number:
PCT/JP2017/001360
Publication Date:
July 26, 2018
Filing Date:
January 17, 2017
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C21D9/46; C22C38/00
Domestic Patent References:
WO2015041159A12015-03-26
Foreign References:
JP2006283064A2006-10-19
JP2010275612A2010-12-09
JP2006152427A2006-06-15
JP2012041613A2012-03-01
JP2014156653A2014-08-28
JPS5756773B21982-12-01
JP2014118613A2014-06-30
JPS542191B21979-02-03
Other References:
TATEYAMA, SHOTA ET AL.: "Microstructures and Mechanical Properties of V and/or Nb Bearing Ultrahigh Strength Hot Stamped Steel Components", JOURNAL OF THE IRON & STEEL INSTITUTE OF JAPAN, vol. 100, no. 9, 1 September 2014 (2014-09-01), pages 1114 - 1122, XP055513513
KAWABE YOSHIKUNI, TETSU-TO-HAGANE, vol. 68, 1982, pages 2595
See also references of EP 3572536A4
Attorney, Agent or Firm:
KOKUBUN, Takayoshi (JP)
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